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Cosmology Talks: DESI detects BAOs!

Posted in The Universe and Stuff with tags , , , , on May 15, 2023 by telescoper

It’s been too long since I last posted one of the cosmology talks curated on YouTube by Sean Hotchkiss so I will endeavour to put that right by posting one today.

In this video, Jeongin Moon, David Valcin and Christoph Saulder talk about the first cosmologically relevant results from DESI (the Dark Energy Spectroscopic Instrument), including the first detection of the BAOs (Baryon Acoustic Oscillations) therefrom. It’s pretty impressive for a first detection with only two months worth of data, so the final result with the full data set should be spectacular!

You can of course read the paper related to these results (by Moon et al.) on the arXiv here.

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First Light at the Dark Energy Spectroscopic Instrument

Posted in The Universe and Stuff with tags , , , , , , on November 4, 2019 by telescoper

While I was away last week there was quite a lot of press coverage (e.g. here) about the new Dark Energy Spectroscopic Instrument, which has just seen first light. I didn’t have time to mention this until now, and in any case  I have little to add to the coverage that has already appeared, but it does give me the excuse to post this nice video – which features quite a few people I actually know! – to describe  the huge galaxy survey that DESI will perform. It’s hard to believe that when I started in the field in 1985 the largest such survey, which took several years to compile, had only a few thousand galaxies in it. The DESI instrument will be able to determine spectra of more sources than that in a single pointing of the telescope that lasts about 20 minutes. Overall it should determine redshifts of over 35 million galaxies! Vorsprung durch Technik.

 

 

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