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Hossam Khalil

@hossam.bsky.social

astrophysics PhD student at the University of Helsinki studying galaxy clusters and the large-scale structure in X-ray and optical λs hossamkhalilastro.github.io

Posts Replies Media

Hossam Khalil @hossam.bsky.social · 19/08/2026

Paper day! My second 1st-author paper has been accepted for publication in A&A and is now on the arXiv: arxiv.org/abs/2608.17735. We use X-ray data from the first eROSITA-DE all-sky survey (eRASS1) to study the hot gas (baryon) budget of nearby galaxy groups out to the virial radius🧵☄️

arxiv.org

eROSITA cosmology with galaxy groups: hot gas budget out to the virial radius

Non-gravitational processes that expel hot gas beyond the virial regions of groups and clusters of galaxies, known collectively as baryonic feedback, play a key role in reshaping the matter distributi...

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Reposted by Hossam Khalil

Minas Karamanis @minaskar.bsky.social · 30/03/2026

Hey, I wrote a thing about AI in astrophysics ergosphere.blog/posts/the-ma...

ergosphere.blog

The machines are fine. I'm worried about us.

On AI agents, grunt work, and the part of science that isn't replaceable.

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Hossam Khalil @hossam.bsky.social · 05/12/2025

Strong feedback models in hydrodynamical simulations do not reproduce the observed galaxy group X-ray properties. arxiv.org/abs/2512.04203 #astrosci

arxiv.org

The impact of strong feedback on galaxy group scaling relations

Feedback from active supermassive black holes alters the distribution of matter in the Universe by injecting energy in the neighbouring hot gaseous medium, which leads to ejection of gas from the halo...

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Hossam Khalil @hossam.bsky.social · 17/08/2025

Went to a dark-sky location for the Perseids last week. Ended up SATgazing a swarm of stupid starlinks.

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Hossam Khalil @hossam.bsky.social · 27/03/2025

Was a very nice talk. Love seeing X-ray spectral lines that clear for the first time!

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Hossam Khalil @hossam.bsky.social · 12/03/2025

accurate

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Reposted by Hossam Khalil

aaccomazzi.bsky.social @aaccomazzi.bsky.social · 11/02/2025

We are experiencing technical problems which are part of some growing pains (more content, more users, same infrastructure). At the moment there are no funding or programmatic threats to ADS. Thank you for your patience while we sort things out.

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Hossam Khalil @hossam.bsky.social · 14/04/2024

My first first-author paper is out on the arXiv (arxiv.org/abs/2403.170...! A little over a year's work to release AXES-2MRS, an all-sky X-ray galaxy group catalogue based on extended X-ray sources from ROSAT and optical 2MRS galaxies. A thread🧵🔭.

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Hossam Khalil @hossam.bsky.social · 15/09/2023

Just attended one of the nicest talks about NICER (Neutron star Composition explorER). Reminds me of the very first research project at ZC. Really nice to catch up with the pulsars.

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Hossam Khalil @hossam.bsky.social · 11/09/2023

Everyday I ask myself: why did I take an asteroid course this semester? But the answer remains shrouded in the mist

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Hossam Khalil @hossam.bsky.social · 04/09/2023

Room temperature (arXiv) found baryons? Let’s see🔭🧪

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Hossam Khalil @hossam.bsky.social · 28/08/2023

Delayed for the nth time.. Truly cursed

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Hossam Khalil @hossam.bsky.social · 25/08/2023

Doing observational work is so satisfying. You don’t have to worry about right answers. You just get THE right answer.

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