Christian Kirkham
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1420megahertz.bsky.social
Christian Kirkham
@1420megahertz.bsky.social
61 followers 130 following 1 posts
PhD Student at Cavendish Astrophysics ✨ 21cm Radio Cosmology ✨ REACH 📡 Uni of Cambridge ✨ Sywedydd 🏴󠁧󠁢󠁷󠁬󠁳󠁿

https://astrochristian.github.io
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1420megahertz.bsky.social
New paper on the arXiv today! 😎

In this paper we show the importance of accounting for noise and singularities in your calibrator data when calibrating global 21-cm cosmology experiments with Bayesian methods!

arxiv.org/abs/2412.14023
Summary of the three calibration methods tested on the five mock datasets and the lab dataset. Here we plot the fractional difference between the calculated noise of the calibrated validation source solution and the analytic expected noise of the validation source. It can be seen that while the methods perform equally for the mock datasets, we see the methods presented in this paper outperform the existing conjugate priors method on a lab dataset.
December 19, 2024 at 9:40 AM
Reposted by Christian Kirkham
cambridgeastro.bsky.social
The universe’s light-starved early epochs, as well as the first stars and galaxies, lie beyond the reach of conventional observatories but could be revealed by a new generation of radio telescope arrays!

By IoA Professor Anastasia Fialkov 🔭🧪

www.scientificamerican.com/article/new-...
Astronomers Are Using Ancient Light to Map the ‘Dark Ages’ of the Universe
The universe’s light-starved early epochs, as well as the first stars and galaxies, lie beyond the reach of conventional observatories but could be revealed by a new generation of radio telescope arra...
www.scientificamerican.com
December 17, 2024 at 4:05 PM