Higdon, Strauss and Ravel at the National Concert Hall

Posted in Music with tags , , , , , , , , , , on February 21, 2026 by telescoper

And so it came to pass that last night I went to the National Concert Hall in Dublin for another concert by National Symphony Orchestra Ireland, this time conducted by Lio Kuokman and joined, for a performance of the Strauss’s Four Last Songs, by the wonderful soprano Celine Byrne. Given the presence of an Irish favourite it was no surprise to find the concert hall very busy indeed.

The first item on the agenda was the Irish premier of blue cathedral by Jennifer Higdon, an elegaic piece she composed on the death of her younger brother. It’s an interesting piece which is quite easy on the ear as well as incorporating some very original effects. The string section, for example, use handbells to maje gentle tinkling noises near the end. I’ve never heard this piece before and I think it’s one that will bear repeated listening.

Next came the main item on the agenda. The Four Last Songs were published after the composer’s death, so Richard Strauss never heard them performed. The very first time they were performed was in 1950 at the Royal Albert Hall, by the London Philharmonia. One can only imagine what it must have been like for the orchestra making this music live for the very first time.  Apparently the first time any of them had seen the score was when they turned up for the rehearsal. I’m sure they knew as soon as they started playing that it was a masterpiece.

Last night we heard these songs sung by Celine Byyne, who was born in Kildare. She arrived on stage resplendent in a black dress with red feathers around the shoulders. I don’t know how many times I’ve heard these songs and they never fail to move me. The opening of the first song, Frühling, is in the chest register for a soprano which is the most difficult to project over an orchestra, but Celine Byrne took it in her stride, as she did with the others. I must single out the leader of the National Symphony Orchestra Elaine Clark for her gorgeous playing of the lovely violin solo in the third song, Beim Schlafengehen. I don’t mind admitting that it brought a tear to my eye, as did the final Im Abendrot which is one of my very favourite pieces of music. I was sitting next to an elderly couple, and I coultn’t help noticing that they spontaneously held hands on the words “Hand in Hand”.

Incidentally, as far as I know the Four Last Songs were not specifically intended to be performed together as they inevitably are these days. Although the last is my favourite, I think the first three (all based on poems by Herman Hesse) have much more in common with each other than Im Abendrot (which is a poem by Joseph von Eichendorff).

After the wine break we continued with more Strauss, sort of, in the form of a suite from the Opera Der Rosenkavalier. Although Strauss allowed this to be assembled from his music as a concert work I don’t think he actually created it as such. It’s relatively brief ( just over 20 minutes in performance) that begin’s with the opera’s orchestral prelude, depicting the Marschallin’s and Octavian’s night of passion (vividly portrayed by whooping horns). Next comes the appearance of Octavian as the “Rosenkavalier”, depicted in tender gorgeous music; the sight of him looking so young makes the Marschallin realise that he will soon leave her for a younger woman. There follows the duet between Octavian and Sophie (oboe and horn) – in which their love for each other becomes ever more obvious, but this is abruptly interrupted by the discordant music associated with the clumsy arriva of the buffoonish Baron Ochsl. Next the violins tentatively introduce the first waltz, followed by another given out by the solo violin, before the whole orchestra settles into waltz mode. A general pause and a violin solo leads into the nostalgic music where the Marschallin sadly realises she has lost Octavian. Then comes its ecstatic climax. The work closes with another robust waltz, depicting Ochs at his most pompous, and a boisterous coda apparently composed for the suite. Listening to this is like a fast-forward through the opera, but it does lack the vocal parts, and I think Strauss was at his best writing for, especially female, voices.

And finally, picking up on the theme of waltzes prevalent in the preceding piece we had La Valse by Maurice Ravel. This is a great masterpiece, originally conceived as a tribute to the Viennese waltz, but not composed until after the First World War, and turned into a kind of tragic parody, starting out sombre and brooding, gradually building into a garish intensity and then into a brutal, almost chaotic, ending.

This was a very nice concert, with a varied programme and some fine playing throughout. The performance being relatively short, and wanting to avoid sitting in Pearse station for a long time waiting in Pearse Station for the 10.14 train, I broke with tradition and took a bus. I started out about 20 minutes earlier than I would have done had I waited for the train, but when I got to Maynooth at a bus stop next to the railway station, the train I would have got had just arrived….

Weekly Update from the Open Journal of Astrophysics – 21/02/2026

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , on February 21, 2026 by telescoper

It’s Saturday once more so time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further six papers, bringing the number in Volume 9 (2026) to 36 and the total so far published by OJAp up to 484.

I will continue to include the posts made on our Mastodon account (on Fediscience) to encourage you to visit it. Mastodon is a really excellent service, and a more than adequate replacement for X/Twitter (which nobody should be using); these announcements also show the DOI for each paper.

The first paper to report this week is “SKA-Low simulations for a cosmic dawn/epoch of reionisation deep field” by Anna Bonaldi, Philippa Hartley, Simon Purser & Omkar Bait (SKAO, UK), Eunseong Lee (U. Manchester, UK), Robert Braun (SKAO), Florent Mertens (Sorbonne Université, France), Andrea Bracco (Osservatorio Astrofisico di Arcetri, IT), Wendy Williams (SKAO) and Cath Trott (Curtin U., Australia). This paper presents a simulation of an SKA-Low cosmic dawn/epoch of reionisation observation to advance foreground-mitigation approaches: the simulation includes various sky components and modelled errors, allowing for efficacy assessment. It was published on Monday 16th February in the folder Cosmology and Nongalactic Astrophysics.

The overlay is here:

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "SKA-Low simulations for a cosmic dawn/epoch of reionisation deep field" by Anna Bonaldi, Philippa Hartley, Simon Purser & Omkar Bait (SKAO, UK), Eunseong Lee (U. Manchester, UK), Robert Braun (SKAO), Florent Mertens (Sorbonne Université, France), Andrea Bracco (Osservatorio Astrofisico di Arcetri, IT), Wendy Williams (SKAO) and Cath Trott (Curtin U., Australia)

doi.org/10.33232/001c.157763

February 16, 2026, 8:28 am 1 boosts 1 favorites

The second paper is “V717 Andromedae: An Active Low Mass Ratio Contact Binary” by Surjit S. Wadhwa (Western Sydney U. Australia), Marko Grozdanovic (Astronomical Observatory Belgrade, Serbia), and Nicholas F.H Tothill, Miroslav D. Filipovic, Ain Y. De Horta (Western Sydney U.). This was also published on Monday 1th February, but in the folder Solar and Stellar Astrophysics. The article discusses the contact binary V717 Andromedae, an extreme low mass ratio system with high inclination and moderate contact, showing signs of chromospheric activity but stable and not a merger candidate

The overlay for this one is here:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "V717 Andromedae: An Active Low Mass Ratio Contact Binary" by Surjit S. Wadhwa (Western Sydney U. Australia), Marko Grozdanovic (Astronomical Observatory Belgrade, Serbia), and Nicholas F.H Tothill, Miroslav D. Filipovic, Ain Y. De Horta (Western Sydney U.)

doi.org/10.33232/001c.157764

February 16, 2026, 8:56 am 0 boosts 0 favorites

Next, published on Tuesday 17th February in the folder High-Energy Astrophysical Phenomena, is “DIPLODOCUS II: Implementation of transport equations and test cases relevant to micro-scale physics of jetted astrophysical sources” by Christopher N Everett (Oxford U., UK), Marc Klinger-Plaisier (U. Amsterdam, NL) and Garret Cotter (Oxford). This one discusses further applications of DIPLODOCUS, which is a framework developed for particle distribution transport, with its numerical implementation detailed in Diplodocus.jl. It uses a new sampling technique and is tested on micro-scale physical effects. The first paper in the series can be found here.

The overlay is here:

The official version can be found on arXiv here and the Fediverse announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "DIPLODOCUS II: Implementation of transport equations and test cases relevant to micro-scale physics of jetted astrophysical sources" by Christopher N Everett (Oxford U., UK), Marc Klinger-Plaisier (U. Amsterdam, NL) and Garret Cotter (Oxford)

doi.org/10.33232/001c.157823

February 17, 2026, 7:13 am 1 boosts 2 favorites

The fourth paper this week, also published on Tuesday 17th February, but in the folder Cosmology and Nongalactic Astrophysics is “Revisiting the Great Attractor: The Local Group’s streamline trajectory, cosmic velocity and dynamical fate” by Richard Stiskalek (Oxford U., UK), Harry Desmond (U. Portsmouth, UK), Stuart McAlpine (Stockholm, SE), Guilhem Lavaux (Sorbonne Université, FR), Jens Jasche (Stockholm) and Michael J. Hudson (U. Waterloo, Canada). This paper revisits the so-called “Great Attractor” concept, finding that it doesn’t dominate the Local Group’s cosmic velocity; multiple structures contribute to the motion, with no single attractor accounting for the flow.

Here is the overlay:

The official version can be found on arXiv here and the Fediverse announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Revisiting the Great Attractor: The Local Group’s streamline trajectory, cosmic velocity and dynamical fate" by Richard Stiskalek (Oxford U., UK), Harry Desmond (U. Portsmouth, UK), Stuart McAlpine (Stockholm, SE), Guilhem Lavaux (Sorbonne Université, FR), Jens Jasche (Stockholm) and Michael J. Hudson (U. Waterloo, Canada)

doi.org/10.33232/001c.157824

February 17, 2026, 7:33 am 3 boosts 1 favorites

The fifth paper this week, is “JWST observations of three long-period AM CVn binaries: detection of the donors and hints of magnetically truncated disks” by Kareem El-Badry (Caltech), Antonio C. Rodriguez (CfA Harvard), Matthew J. Green (U. Oklahoma) & Kevin B. Burdge (MIT); all based in the USA. The article was published on Thursday 19th February 2026 in the folder Solar and Stellar Astrophysics. The paper describes high-cadence infrared spectroscopy used to analyze three long-period, eclipsing AM CVn (AM Canum Venaticorum) binaries; findings suggest the presence of magnetized white dwarf accretors, with surface magnetic fields of 30-100 kG.

The overlay is here:

The accepted version can be found on arXiv here, and the fediverse announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "JWST observations of three long-period AM CVn binaries: detection of the donors and hints of magnetically truncated disks" by Kareem El-Badry (Caltech), Antonio C. Rodriguez (CfA Harvard), Matthew J. Green (U. Oklahoma) & Kevin B. Burdge (MIT); all in USA

doi.org/10.33232/001c.157856

February 18, 2026, 8:15 am 1 boosts 0 favorites

Finally for this week we have “Ultra-long Gamma-ray Bursts from Micro-Tidal Disruption Events: The Case of GRB 250702B” by Paz Beniamini (Open University, IL), Hagai B. Perets (Technion, IL) and Jonathan Granot (Open University, IL); all based in Israel. The paper was published on Friday 18th February 2026 in the folder High-Energy Astrophysical Phenomena.

The overlay is here:

You can find the officially accepted version on arXiv here and the Mastodon announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Ultra-long Gamma-ray Bursts from Micro-Tidal Disruption Events: The Case of GRB 250702B" by Paz Beniamini (Open University, IL), Hagai B. Perets (Technion, IL) and Jonathan Granot (Open University, IL)

doi.org/10.33232/001c.157985

February 20, 2026, 8:43 am 0 boosts 0 favorites

And that concludes this week’s update. I will do another next Saturday, by which time I expect we will have published a similar number of papers to this week.

A Quarter Term

Posted in Biographical, Education, mathematics, The Universe and Stuff with tags , , on February 20, 2026 by telescoper
I searched for a free stock image using “quarks” as a search term and found this photo by Anh Nguyen on Pexels.com.

On most Friday afternoons there is a seminar in the Physics Department at Maynooth University, and I got it into my mind that there was one this afternoon and set aside an hour to attend it. It turns out that there isn’t a seminar so I have time to write a quick blog post before I head to Dublin for a concert.

We’ve (almost) reached the end of Week 3 of the Semester which means we’re about a quarter of the way through the term. Yesterday we did the first Lab Test of four in Computational Physics, which went off without any major problems. The first class test in Particle Physics will be next week and I hope that goes equally well.

Today’s the day students officially received their provisional first semester results. When I arrived at my particle physics lecture this morning the students were discussing their exam marks. Most seemed relatively happy, which is good because this is the final year for most of these students so their grades matter more now than in previous years.

This morning’s lecture was quite amusing. I was discussing electrostatic interactions between quarks in nucleons and in the course of that I asked the class to calculate (2/3)×(-1/3) +(-1/3)×(-1/3)+(-1/3)×(2/3). It took a surprisingly long time to arrive at the right answer! To make matters worse, when I announced the correct answer I got the sign wrong*.

It’s been a long week.

Anyway, next week I’ll be starting on the Dirac Equation, and on the basis of today’s events I wonder about the wisdom of having a lecturer who can’t do minus signs teach relativistic quantum mechanics to students who struggle to do simple arithmetic with fractions!

*ANS=-1/3

Ash Wednesday Observance

Posted in Biographical, Maynooth with tags , , on February 19, 2026 by telescoper

Yesterday was Ash Wednesday. I remember this time eight years ago when I was very much a newcomer to Maynooth being quite surprised to see some folk wearing a cross marked in ash on their forehead as in the picture above. I think this practice is a tradition within the Roman Catholic Church, with which Maynooth has long historical associations, so it’s not really surprising to see it here. Having been brought up in Protestant England I had never seen this before moving to Ireland, but it doesn’t surprise me any more to see people with crosses on their foreheads. That said, I noticed very few around the place yesterday. The numbers observing this ritual seem to be declining every year. Perhaps if they want to increase its popularity they could zhuzh it up a bit: how about some glitter in the ash? Just a thought.

Apparently the tradition used to be for ashes to be sprinkled on the top of the head of a male worshipper but a cross to be made on the forehead of a woman because she would be expected to be wearing a hat. Based on a small sample of those I have observed it seems both genders wear the cross on the forehead nowadays.

Anyway, although I’m not a Christian myself, respect to all those observing the season of Lent (Quadragesima), whether that means fasting, devotional prayer, or just giving up luxuries, such as reading this blog perhaps.

P.S. I’m told that the normal rule for Lent is `One meal and two collations’. The word collation, in the sense of ‘light meal,’ comes from the title of John Cassian‘s early fifth-century work Collationes patrum in scetica eremo (Conferences with the Egyptian hermits), which was read in Benedictine communities before a light meal. I haven’t heard that English word for a while, but it has the same origin as the Italian colazione, used in prima colazione (breakfast).

Astrophysics Wrapped 2025

Posted in Open Access, The Universe and Stuff with tags , , , , , on February 18, 2026 by telescoper

An interesting paper has appeared on the arXiv by Lewis, Shah & Alfred with the title Astrophysics Wrapped 2025: Year-in-Review of Every Astrophysics arXiv Paper from 2025 and abstract as follows:

Over the past few years, Astrophysics has experienced an unprecedented increase in research output, as is evident from the year-over-year increase in the number of research papers put onto the arXiv. As a result, keeping up with progress happening outside our respective sub-fields can be exhausting. While it is impossible to be informed on every single aspect of every sub-field, this paper aims to be the next best thing. We present a summary of statistics for every paper uploaded onto the Astrophysics arXiv over the past year – 2025. We analyse a host of metadata ranging from simple metrics like the number of pages and the most used keywords, as well as deeper, more interesting statistics like the distribution of journals to which papers are submitted, the most used telescopes, the most studied astrophysical objects including GW, GRB, FRB events, exoplanets and much more. We also indexed the authors’ affiliations to put into context the global distribution of research and collaboration. Combining this data with the citation information of each paper allows us to understand how influential different papers have been on the progress of the field this year. Overall, these statistics highlight the general current state of the field, the hot topics people are working on and the different research communities across the globe and how they function. We also delve into the costs involved in publications and what it means for the community. We hope that this is helpful for both students and professionals alike to adapt their current trajectories to better benefit the field.

The paper does what is says in the abstract and is well worth reading because it gives some fascinating insights into what’s hot in astrophysics, at least in terms of arXiv submissions which is probably a very good measure of activity because it is a truth universally acknowledged that every paper of interest in astrophysics is on ar|Xiv. I don’t intend to duplicate the whole paper here, as I think you should go and read it yourselves, but will pick out a couple of points.

One, near the start of the paper, is the following:

We begin with some general, overarching statistics from the year. As mentioned before, there were 18660 research papers published this year on the arXiv under the Astrophysics category in comparison to 16333 articles published in 2024. On average, there were 1555 papers per month, or about 72 papers per day, excluding weekends and accounting for the fact that arXiv uploads 5 days a week. 

This is a huge level of activity by any standard, especially as it does not include replacements or cross-submissions. As Editor of the Open Journal of Astrophysics it comes as no surprise to learn that the section `Astrophysics of Galaxies’ is the highest submitted primary subject category with 4761 papers submitted over the year and an average of 397 papers per month under this category. Interestingly, ‘Cosmology and Nongalactic Astrophysics’ papers have the highest number of citations across all indices, by some margin, despite having a lower number of papers submitted under this category. This tells us that while there might be fewer papers under this category, these papers are cited more on average, than the papers from any of the other categories. These are the two most popular categories for submissions at OJAp too.

For more interesting data on geographical distribution, citation rates, etc, read the text!

I also want to pick up on an issue mentioned near the end of the abstract, namely the absurd system of funding “Gold” Open Access by Article Processing Charges. Here is a quote:

We estimate the total amount of money spent in publishing to paid journals, assuming every paper is published under Gold Open Access. Our calculation takes into account the publishing fees for different journals, the cost per page where applicable, as well as discounted rates for authors from certain ‘member’ countries for specific journals. In total, we estimate the community spent 17 million USD on publishing fees this year. Counting only the papers that were published and ignoring the zero cost of open source journals, this rounds out to an absolutely ridiculous 2,400 USD per publication. If every astrophysics paper published on the arXiv in 2025 were to be published under the same standards (average cost from the previous calculation applied to every paper), that would mean a total cost of 45 million USD on publishing. These numbers are similar to those obtained in Coles (2025). Astrophysics is, according to our calculations, a multi-million dollar business, but for whom? Certainly not for the people who make it possible. Definitely not for the scientists and not for the general public.

(I added the link to my own post at the OJAp blog which is referred to in the article).

I agree wholeheartedly with the conclusion. The figure of 45 million dollars for the money wasted on APCs is nothing short of a scandal. Why does the astrophysics community put up with being fleeced in this way?

Here is another excerpt:

While it is nice to have the Open Journal of Astrophysics singled out for praise, the earlier statistics do put the situation in perspective. In 2025 OJAp published 213 papers using our arXiv overlay model. That’s only just over 1% of the overall arXiv submissions on astro-ph! As a community we need to be publishing via a Diamond Open Acess model by default. Given the scale of the problem The Open Journal of Astrophysics can’t achieve that goal on its own, but at least we’re showing that there is a way forward.

Fat Tuesday – Bourbon Street Parade

Posted in Biographical, Jazz with tags , , , on February 17, 2026 by telescoper

Today’s  the day folk in England  Shrove Tuesday, when one is supposed to get “shriven” by doing a penance before Lent. Another name for the occasion – favoured in Ireland – is Pancake Day, although I’m not sure what sort of penance it is to be forced to eat pancakes. Further afield the name for this day is a bit more glamorous. Mardi Gras, which I translated for the title of this post as Fat Tuesday using my schoolboy French, doesn’t make me think of pancakes but of carnivals. And being brought up in a house surrounded by Jazz, it makes me think of New Orleans and the wonderful marching bands that played not just during the Mardi Gras parades but at  just about every occasion for which they could find an excuse, including funerals.

The Mardi Gras parades gave rise to many of the great tunes of New Orleans Jazz, many of them named after the streets through which the parade would travel, mainly in  the famous French Quarter. Basin Street, South Rampart Street, and Bourbon Street are among the names redolent with history for Jazz fans and musicians around the world. The New Orleans Mardi Gras has on recent occasions sometimes got a bit out of hand, and you probably wouldn’t want to take kids into the French Quarter for fear they would see things they shouldn’t. Personally, though, I’d love the chance to savour the atmosphere and watch the parades.

Anyway, the clip I’ve chosen to mark the occasion of Fat Tuesday is Bourbon Street Parade. The one and only time I went to New Orleans I felt a real thrill walking along this Bourbon Street, just because I’ve heard the tune so many times on old records.  I didn’t go in Mardi Gras time, however, but in the middle of summer. The heat was sweltering and the humidity almost unbearable, but the air was filled with music as well as moisture. It was impossible to sleep in the heat, so I stayed up moving from bar to bar, drinking and listening to music until I was completely exhausted.

The tune was written by the late Paul Barbarin, who died in 1969 during a street parade in New Orleans. What a way to go! He also plays on the clip I included here. I picked this particular version because it features a much underrated British musician, Sammy Rimington. My Dad once played with Sammy Rimmngton and I remember the unqualified admiration with which he (my Dad) spoke of his (Sammy’s) playing.

P.S. This year Pancake Day coincides with both the Lunar New Year and the start of Ramadan. Best wishes to all who celebrate any of these!

The Trouble with Teaching Particle Physics…

Posted in Education, The Universe and Stuff with tags , on February 16, 2026 by telescoper

The trouble with teaching particle physics is that students start out thinking that the standard model looks like this

when it’s really more like this

I hope this clarifies the situation.

On the Blog

Posted in Biographical, Science Politics with tags , , , on February 15, 2026 by telescoper

This “shitty WordPress blog” (to use someone’s memorable phrase) has been going for over 17 years now. I have occasionally thought about breaking the habit but having gone this far I think I might as well keep going until I retire, by which time in it will have reached the grand old age of 20.

In recent years the traffic here has settled down to a level about 40% lower than it was in its heyday. There are about 2,000 people recceiving posts by email and a few hundred who read it on the fediverse; these are not counted in the web traffic statistics unless they click through to the website.

The most popular year ever for web traffic was 2012, in which In The Dark attracted 464k visitors, whereas for the last few years it has been more like 260k per annum. Part of the reason for the drop will have been my move to Ireland and not posting so much of relevance to people in the UK, which was my main audience. I prefer not to think that the decline is because I’m now older and my posts more boring, but that may well the case. Twitter used to be the source of a considerable number of clicks too, but the changes introduced by Elon Musk put a stop to that even before I left that platform. In any case the blog numbers are far higher than I thought I would attract when I started blogging way back in 2008.

Anyway, I have noticed that in recent weeks the levels of traffic have been closer to those of a decade or more ago, with several notifications like this popping up:

In the first two weeks of February, for example, there have been over 30k views, i.e. over 2000 per day. The drivers of this increase have been two posts about the STFC funding crisis, first mine at the end of January and then a Guest Post by George Efstathiou which has been shared very widely.

I suppose the recent increase in traffic is a new manifestation of the old adage that “bad news sells newspapers”…

Time After Time – Chet Baker

Posted in Jazz with tags , , on February 14, 2026 by telescoper

It seems an appropriate evening for a romantic love song. Lyrics by Sammy Cahn, music by Jule Styne, vocals and trumpet by Chet Baker. Baker’s singing is quite unlike most jazz singers, and many jazz fans don’t like it very much, but I think his intimate, tender, and somewhat melancholic vocal performance together with his spare yet lyrical trumpet playing combine make this a classic.

Weekly Update from the Open Journal of Astrophysics – 14/02/2026

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , on February 14, 2026 by telescoper

It’s Saturday once more so time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further six papers, bringing the number in Volume 9 (2026) to 30 and the total so far published by OJAp up to 478.

I will continue to include the posts made on our Mastodon account (on Fediscience) to encourage you to visit it. Mastodon is a really excellent service, and a more than adequate replacement for X/Twitter (which nobody should be using); these announcements also show the DOI for each paper.

The first paper to report this week is “Faraday Depolarization Study of a Radio Galaxy Using LOFAR Two-metre Sky Survey: Data Release 2” by Samantha Sneha Paul and Abhik Ghosh (Banwarilal Bhalotia College, India). This was published on Tuesday February 10th in the folder Cosmology and Nongalactic Astrophysics. The paper analyzes the depolarization of radio galaxy ILTJ012215.21+254334.8 using LOFAR’s Sky Survey data, revealing a preferred three-component model and highlighting turbulence in the magneto-ionic medium.

The overlay is here:

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Faraday Depolarization Study of a Radio Galaxy Using LOFAR Two-metre Sky Survey: Data Release 2" by Samantha Sneha Paul and Abhik Ghosh (Banwarilal Bhalotia College, India)

doi.org/10.33232/001c.157500

February 10, 2026, 6:25 am 0 boosts 1 favorites

The second paper is “Rapid cosmological inference with the two-loop matter power spectrum” by Thomas Bakx (Utrecht U., NL), Henrique Rubira (Ludwig-Maximilians-Universität, DE), Nora Elisa Chisari (Utrecht) and Zvonimir Vlah (Ruđer Bošković Institute, Croatia). This was also published on Tuesday February 10th in the folder Cosmology and Nongalactic Astrophysics. This paper uses the COBRA method to compute the two-loop effective field theory power spectrum of dark matter density fluctuations, providing more precise cosmological constraints than the one-loop EFT.

The overlay for this one is here:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Rapid cosmological inference with the two-loop matter power spectrum" by Thomas Bakx (Utrecht U., NL), Henrique Rubira (Ludwig-Maximilians-Universität, DE), Nora Elisa Chisari (Utrecht) and Zvonimir Vlah (Ruđer Bošković Institute, Croatia)

doi.org/10.33232/001c.157501

February 10, 2026, 6:41 am 0 boosts 0 favorites

Next, published on Wednesday 11th February in the folder Astrophysics of Galaxies, is “Interpreting nebular emission lines in the high-redshift Universe” by Aswin P. Vijayan (U. Sussex, UK) and 9 others based in the UK, Taiwan, China and The Netherlands. This article examines the reliability of diagnostics used to estimate star formation rate and gas-phase oxygen abundance in high-redshift galaxies. It finds that variations in stellar populations and star-dust geometry. The overlay is here:

The official version can be found on arXiv here and the Fediverse announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Interpreting nebular emission lines in the high-redshift Universe" by Aswin P. Vijayan (U. Sussex, UK) and 9 others based in the UK, Taiwan, China and The Netherlands

doi.org/10.33232/001c.157554

February 11, 2026, 8:21 am 0 boosts 0 favorites

The fourth paper this week, also published on Wednesday 11th February, but in the folder Instrumentation and Methods for Astrophysics is “Derivative-Aligned Anticipation of Forbush Decreases from Entropy and Fractal Markers” by Juan D. Perez-Navarro & David Sierra Porta (Universidad Tecnológica de Bolívar, Colombia). The paper presents a feature-based framework for predicting Forbush decreases, i.e. rapid, temporary drops in galactic cosmic ray (GCR) intensity (up to tens of percent) caused by solar wind disturbances, typically Coronal Mass Ejections (CMEs) or high-speed streams from coronal holes, in neutron-monitor records using various computational methods. The approach is reproducible, operates on native station units, and is stable.

Here is the overlay:

The official version can be found on arXiv here and the Fediverse announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Derivative-Aligned Anticipation of Forbush Decreases from Entropy and Fractal Markers" by Juan D. Perez-Navarro & David Sierra Porta (Universidad Tecnológica de Bolívar, Colombia)

doi.org/10.33232/001c.157585

February 11, 2026, 5:19 pm 0 boosts 0 favorites

The fifth paper, the penultimate for this week, is “Supermassive black hole growth from stellar binary encounters” by Aubrey L Jones and Benjamin C Bromley (University of Utah, USA). This paper explores the growth of supermassive black holes (SMBHs) through stellar accretion via the Hill’s mechanism, predicting capture rates and identifying potential growth drivers in 91 galaxies. It was published on Thursday 11th February 2026 in the folder Astrophysics of Galaxies.

The overlay is here:

The accepted version can be found on arXiv here, and the fediverse announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Supermassive black hole growth from stellar binary encounters" by Aubrey L Jones and Benjamin C Bromley (University of Utah, USA)

doi.org/10.33232/001c.157589

February 12, 2026, 7:31 am 1 boosts 2 favorites

Finally for this week we have “Dynamics in the Cores of Self-Interacting Dark Matter Halos: Reduced Stalling and Accelerated Core Collapse” by Frank C. van den Bosch and Shashank Dattathri (Yale University, USA). This study uses simulations to explore core dynamics in self-interacting dark matter (SIDM) halos. Findings suggest strong self-interactions prevent core stalling and buoyancy, leading to accelerated core collapse. This was published yesterday, on Friday 13th February 2026, in the folder Astrophysics of Galaxies.

The overlay is here:

You can find the published version of the article here, and the Mastodon announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Dynamics in the Cores of Self-Interacting Dark Matter Halos: Reduced Stalling and Accelerated Core Collapse" by Frank C. van den Bosch and Shashank Dattathri (Yale University, USA)

doi.org/10.33232/001c.157701

February 13, 2026, 8:27 am 1 boosts 2 favorites

And that concludes this week’s update. I will do another next Saturday.