Weekly Update from the Open Journal of Astrophysics 20/06/2026

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , , , , , , , , , , , , , , , , , , , , on June 20, 2026 by telescoper

It’s Saturday again so it’s time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further four papers, bringing the number in Volume 9 (2026) to 126 and the total so far published by OJAp up to 574.

I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.

The first paper to report this week, published on Monday 15th June, is “SN 2025adpq: A Type Ia supernova in a collisional ring formed during a major galaxy merger” by Brendan O’Connor (Carnegie Mellon University, USA) and 18 others based in the USA, Germany and Australia. The study reports the discovery of a Type Ia supernova, SN 2025adpq, within a collisional ring formed by a major galaxy merger., offset from the nucleus of the primary galaxy. It is published in the folder Astrophysics of Galaxies.

The overlay for this paper 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: "SN 2025adpq: A Type Ia supernova in a collisional ring formed during a major galaxy merger" by Brendan O'Connor (Carnegie Mellon University, USA) and 18 others based in the USA, Germany and Australia

doi.org/10.33232/001c.163422

June 15, 2026, 8:29 am 1 boosts 1 favorites

The second paper for this week, published on Tuesday June 16th in the folder Astrophysics of Galaxies is “The Colors of Ices: Measuring ice column density through photometry” by Adam Ginsburg (U. Florida, USA) and ten others based in the USA, Germany and Spain. This study demonstrates that JWST photometry can identify and quantify interstellar ices, using new open-source models, interstellar ices, finding significant abundance in non-star-forming gas, suggesting many avenues for further research.

The overlay looks like this:

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: "The Colors of Ices: Measuring ice column density through photometry" by Adam Ginsburg (U. Florida, USA) and ten others based in the USA, Germany and Spain

doi.org/10.33232/001c.163469

June 16, 2026, 7:26 am 1 boosts 1 favorites

The third paper of the week, published on Wednesday 17th June in the folder Cosmology and Nongalactic Astrophysics is “The Non-Gaussian Weak-Lensing Likelihood: A Multivariate Copula Construction and Impact on Cosmological Constraints” by Veronika Oehl and Tilman Tröster (both of ETH Zurich, Switzerland). This study presents a framework for computing non-Gaussian likelihoods for correlation functions, particularly useful in large-scale weak-lensing surveys. It suggests Gaussian likelihoods are sufficient for stage-IV surveys.

The overlay for this one is here:

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

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "The Non-Gaussian Weak-Lensing Likelihood: A Multivariate Copula Construction and Impact on Cosmological Constraints" by Veronika Oehl and Tilman Tröster (ETH Zurich, Switzerland)

doi.org/10.33232/001c.163550

June 17, 2026, 8:30 am 1 boosts 0 favorites

The fourth and final paper of the week, also ublished on Wednesday 17th June but in the folder Astrophysics of Galaxies, is “Black Hole Feedback, Galaxy Quenching and Outflows at Cosmic Dawn: Analysis of the SEEDZ Simulations” by Lewis R. Prole (Maynooth University, Ireland) and 15 others based in Ireland, Germany, USA and UK. The study analyzes the growth and feedback effects of massive black holes in SEEDZ simulations, suggesting that black hole feedback, not nearby supernovae or gas exhaustion, limits initial growth.

The overlay is here:

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

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Black Hole Feedback, Galaxy Quenching and Outflows at Cosmic Dawn: Analysis of the SEEDZ Simulations" by Lewis R. Prole (Maynooth University, Ireland) and 15 others based in Ireland, Germany, USA and UK.

doi.org/10.33232/001c.163549

June 17, 2026, 8:09 am 2 boosts 1 favorites

And that concludes this week’s update. It has been another slow week on the publishing front, but the main reason is that we have a big backlog of papers accepted – about 10 of them – but still waiting for the authors to put their final versions on arXiv and we can’t do anything about that! I’ll do another update next Saturday.

The 2026 Leaving Certificate Physics Papers

Posted in Education with tags , on June 19, 2026 by telescoper

While I remember I thought I’d follow up my post about the 2026 Leaving Certificate Mathematics papers, by uploading this year’s Physics papers. Here is the Higher level paper:

You can find some reaction to it here and here. I think it’s quite a nice paper, with plenty of choice. See what you think!

And here is the Ordinary level paper:

The Football Players – Henri Rousseau

Posted in Art, Football, Rugby with tags , , , , , , on June 19, 2026 by telescoper

The Football* Players (Les joueurs de football) by Henri Rousseau (1908, Oil on Canvas, 100.3 x 81.1 cm, Guggenheim Museum, New York)

(Obviously it’s Rugby Football…)

Maynooth University Library Cat Update

Posted in Maynooth with tags , , , on June 18, 2026 by telescoper

zzzzz…

Bayesian Inductive Inference and the Anthropic Cosmological Principle

Posted in The Universe and Stuff with tags , , , , , , on June 17, 2026 by telescoper

Many moons ago I wrote a paper with a person called Anthony J.M. Garrett with the title Bayesian Inductive Inference and the Anthropic Cosmological Principle; the full reference is A.J.M. Garrett and P. Coles, Comments on Astrophysics 17(1) 23-47 (1993). It got a few citations here and there, and has been discussed in a few books and other texts. In 1999, the journal Comments on Astrophysics was merged with some other journals to form Comments on Modern Physics which was then acquired by publishers Taylor and Francis in 2001, when it took over Gordon and Breach. The new publisher never put the old papers online in digital format. Most of the back catalogue of Comments on Astrophysics is indexed in NASA/ADS (bibstem: ComAp), but No. 1 of Volume 17 is not there. That classic paper is not, as far as I know, available anywhere on the internet. Or at least it wasn’t until now.

I was recently asked for a PDF of the paper so I made a scan and sent it. Now that I have a scan, however, and WordPress now has a PDF upload gadget, I thought I’d put it up here. I did a Google search for it earlier this evening and the AI Summary described the paper as “seminal”, which just goes to show that AI isn’t always wrong!

Anyway, here is a scanned PDF of the paper:

Apologies that it’s a bit grubby and wonky, but the scan is made from an old photocopy. I did have a proper offprint somewhere, but I can’t find it.

The real reason for doing this post, however, is to use it as a counter-example to something people often bring up when I criticize academic publishers: “..but they curate the literature!”. They don’t, actually. Libraries do that. The Garrett-Coles paper is available as a hard copy in libraries, but the publisher has nothing to do with that!

P.S. I did a blog post a while ago based on part of the paper.

P.P.S. If I get time I’ll contact ADS to see if they want to put this up in the official biblipgraphic collection…

Euclid Update – Revised Timeline

Posted in Euclid, mathematics, The Universe and Stuff with tags , , , , , , , , on June 16, 2026 by telescoper

In a post last week I hinted that I hoped soon to be able to provide an update on progress with the European Space Agency’s Euclid Mission. People within the Euclid Consortium have known for some time, but it has now been officially announced by ESA, that the timeline for the first full Data Release (DR1; originally scheduled for October 2026) has now been revised.

The plan now is for DR1 to happen in stages, with a first tranche to occur in November 2026 (precise date yet to be announced). The complete data release will take place in mid-2027 (probably in June). The sky area covered by DR1 will be about covering a large sky area of about 1900 deg².

To give a little more background, the data products from the Euclid survey are divided into three levels of data processing function:

  • LE1 – the “raw” data frames, prior to calibration, generated at the Science Operations Centre from the time-ordered data and telemetry received from the spacecraft
  • LE2 – the calibrated and corrected data for the two instruments (VIS and NISP) – images, spectra, catalogues of point sources, etc
  • LE3 – the high-level data products (galaxy catalogues, cosmic shear maps, etc) designed for cosmological analysis

The first release will comprise LE1 and LE2 only. This will be called DR-Foundation. The LE3 data will be added next year to make the full DR1. Since LE3 is required for the cosmological analysis that is the prime motivation for the Euclid mission, it follows that there will be no official cosmology results from Euclid DR1 until mid-2027 at the earliest. Other results based on “Foundation” data may of course emerge before then.

I hope this clarifies the situation.

P.S. Irish physicists and astronomers will be particularly interested to know that the LE1 data includes information about the spacecraft and instrument pointing orientations, which is stored in the form of quaternions

Bloomsday 2026

Posted in Literature with tags , , , , on June 16, 2026 by telescoper

So it’s 16th June, a very special day in Ireland – especially Dublin – because 16th June 1904 is the date on which the story takes place of Ulysses by James Joyce. Bloomsday – named after the character Leopold Bloom – is an annual celebration not only of all things Joycean but also of Ireland’s wider cultural and literary heritage.

If you haven’t read Ulysses yet then you definitely should. It’s one of the great works of modern literature. And don’t let people put you off by telling you that it’s a difficult read. It’s a long read,  that’s for sure -it’s over 900 pages – but the writing is full of colour and energy and it has a real sense of place. It’s a wonderful book. I’ve read it three times now, once as a teenager, once in my thirties, and again a few years ago when I’d reached sixty. Don’t worry if you don’t understand all of Ulysses. It’s like life: most of us never figure out what that’s all about, and it doesn’t really matter.

Joyce once said of Ulysses

I’ve put in so many enigmas and puzzles that it will keep the professors busy for centuries arguing over what I meant.

Well, he wasn’t wrong about that! They’re still arguing, The text is a kind of cultural celebration: references to Greeky mythology jostle with popular songs, lists, parodies, question-and-answer sections, and records of the characters innermost thoughts. The book is full of allusions and part of the fun is trying to follow them up. And anyone who likes puns will have a field day!

Anyway, here’s an excerpt. It’s from near the start of Chapter 4, where we meet Mr Leopold Bloom for the first time and discover that he’s fond of cats. He is making breakfast for his wife Molly, who is still in bed. I don’t know if Joyce ever had a cat, but he obviously knew a lot about them!

–o–

Another slice of bread and butter: three, four: right. She didn’t like her plate full. Right. He turned from the tray, lifted the kettle off the hob and set it sideways on the fire. It sat there, dull and squat, its spout stuck out. Cup of tea soon. Good. Mouth dry. The cat walked stiffly round a leg of the table with tail on high.

—Mkgnao!

—O, there you are, Mr Bloom said, turning from the fire.

The cat mewed in answer and stalked again stiffly round a leg of the table, mewing. Just how she stalks over my writingtable. Prr. Scratch my head. Prr.

Mr Bloom watched curiously, kindly the lithe black form. Clean to see: the gloss of her sleek hide, the white button under the butt of her tail, the green flashing eyes. He bent down to her, his hands on his knees.

—Milk for the pussens, he said.

—Mrkgnao! the cat cried.

They call them stupid. They understand what we say better than we understand them. She understands all she wants to. Vindictive too. Cruel. Her nature. Curious mice never squeal. Seem to like it. Wonder what I look like to her. Height of a tower? No, she can jump me.

—Afraid of the chickens she is, he said mockingly. Afraid of the chookchooks. I never saw such a stupid pussens as the pussens.

—Mrkrgnao! the cat said loudly.

She blinked up out of her avid shameclosing eyes, mewing plaintively and long, showing him her milkwhite teeth. He watched the dark eyeslits narrowing with greed till her eyes were green stones. Then he went to the dresser, took the jug Hanlon’s milkman had just filled for him, poured warmbubbled milk on a saucer and set it slowly on the floor.

—Gurrhr! she cried, running to lap.

He watched the bristles shining wirily in the weak light as she tipped three times and licked lightly. Wonder is it true if you clip them they can’t mouse after. Why? They shine in the dark, perhaps, the tips. Or kind of feelers in the dark, perhaps.

I’ll also mention that if you have about 30 hours to spare you can listen to all of a radio broadcast of Ulysses from 1982.

The Cambridge Whistleblowing Saga

Posted in Harassment Bullying etc with tags , , , , on June 15, 2026 by telescoper

This is an update concerning the Employment tribunal I mentioned a couple of weeks ago.

The claimant in the case is Professor Wyn Evans of the Institute of Astronomy at the University of Cambridge. Now that he has finished given evidence, it is now possible to release some of the background publicly. You can read a summary here. If you follow that link you will see reference to this guest post, published on this blog in late 2022:

That old post was carefully anonymised for legal reasons, but it can now be revealed that the Department concerned is, nor surprisingly given the affiliation of the claimant, the Intitute of Astronomy at the University of Cambridge.

I will refrain from commenting further as the case is ongoing, but you can follow updates here. There is also piece about the case in the Guardian here.

P.S. Yes, it has taken a very long time for the matter to reach a head.

My Bucket’s Got a Hole in It

Posted in Biographical, Jazz, Maynooth with tags , , , , on June 14, 2026 by telescoper

“Only connect” is EM Forster’s best known adage about writing, though he didn’t mean it in the context of a “shitty WordPress blog”. Nevertheless I do find it fun sometimes to connect disparate things, so here goes.

I was doing a turn in the garden this afternoon when I noticed that an old bucket left here by the previous occupant had corroded enough to develop a hole:

This reminded me of the old song My Bucket’s Got a Hole in It and especially this very enjoyable version of it by Humphrey Lyttelton’s 1954 seven-piece live at the Conway Hall in London.

It’s hard to believe that it’s 18 years since Humph passed away, but it’s great to hear his voice again in the introduction to the track which ends the A side of the album Humph at the Conway. The cartoon on the cover is by him too. The record features Humph on trumpet, the clarinet by Wally Fawkes (who plays the first clarinet solo) and Bruce Turner on alto sax who switches to clarinet for the second solo but plays sax in the ensembles which sound absolutely terrific as a result. Many “trad” jazz fans took against Humph for including a saxophonist in his band, but Bruce Turner was a great musician and added a new dimension. The other members of the band were Johnny Parker (piano), Micky Ashman (bass), Freddy Legon (banjo) and George Hopkinson (drums).

So that’s one connection. Another is that yesterday saw the announcement of the King’s Birthday Honours in the UK, which was not covered widely here in in Ireland, but which independently reminded me that Humphrey Lyttelton turned down a knighthood on principle back in 1995. Good for him!

For Retired Engineers…

Posted in Biographical, The Universe and Stuff with tags , , , , on June 14, 2026 by telescoper

Many moons ago, just before I moved from Cardiff for my stint at Sussex University, I decided to ditch all the unsolicited letters and manuscripts I’ve accumulated over the years about “alternative” theories of relativity, cosmology, and whatnot. I don’t know why I had kept so many of them for so long, but I no longer have most of them. I did keep one or two of the best ones, however. Here’s an example:

I could never make head nor tail of this, but sometimes had a vague feeling that it might just be a sort of cosmic Rosetta Stone, offering up the Secrets of the Universe in diverse languages. Sadly, however, it’s more likely that the languages involved are Balderdash, Gibberish and Gobbledegook. At the time I wrote:

I regret to announce, therefore, that the plethora of papers telling me why Einstein was wrong, how the Universe is really in the shape of a spiral, how the Great Pyramid of Giza explains the Higgs Boson, and why the Big Bang couldn’t have happened, will have to go to the Great Shredder in the Sky (if that’s where it is).

Anyway, to all my correspondents all I can say is that I’ve enjoyed reading your letters – you must be very fond of your old typewriters – and I’m grateful for the time you took to draw the diagrams by hand in so many lovely colours. And I’m impressed by your qualifications as Electrical Engineers. Really. I’m sorry I didn’t reply to you all individually, but I just didn’t have the time. And now it pains me to realise I don’t have the space either…

I still get such things, of course, but they always come by email nowadays and usually end up in the spam folder, where I do not disturb them. I never reply, of course. Life’s too short.

I know I’m not the only one to have noticed the fact that many – indeed most – such correspondents are Electrical Engineers (usually retired). I was delighted therefore to see that there’s now a nice little paper on arXiv by David Garfinkle with the title Relativity for Retired Engineers and the abstract:

We provide some guidance and examples to clear up common misconceptions about special relativity. These misconceptions often come from trying to express the truths of special relativity in Newtonian terms rather than in terms more natural to special relativity itself. This conceptual stance can also help in attaining a better understanding of general relativity.

Readers may consider referring their correspondents to this source…