Matthieu Béthermin's Avatar

Matthieu Béthermin

@matbethermin.bsky.social

Faculty astronomer at Strasbourg observatory. Star formation in high-z galaxies from sub-galactic scales to large-scale structures. Long distance triathlete when I am not nerding on my laptop. Husband of @karinavoggel.bsky.social.

500 Followers  |  344 Following  |  56 Posts  |  Joined: 22.08.2023  |  2.2345

Latest posts by matbethermin.bsky.social on Bluesky

And is "pedagogy" is the new excuse for bold unfounded claims after "we need to catch the interest of the public"?

17.07.2025 08:46 — 👍 2    🔁 0    💬 0    📌 0

3 problems here:
- you assume that a person who was a very productive researcher on one field can be relevant in another
- you assume that "brillant" people remains "brillant", but people sometimes lose their skills/sanity for various reasons
- you assume citation metric correlates with quality

17.07.2025 08:44 — 👍 6    🔁 0    💬 1    📌 0

Bravo à la collaboration lauréate!

02.06.2025 08:37 — 👍 1    🔁 0    💬 0    📌 0

📢 Une fois de plus, les femmes astronomes sont effacées de l’histoire : le hors-série Ciel & Espace sur les “découvreurs de l’Univers” n’en mentionne qu’une seule.

✊ Pour que les filles d’aujourd’hui aient des modèles.
📄 sf2a.eu/website2023/...

#FemmesEnScience #Astronomie #MatildaEffect

12.05.2025 07:01 — 👍 33    🔁 13    💬 1    📌 4
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I was searching for the cat. There was a strange bump on the guest bed. I looked under and clearly disturbed someone's nap.

24.04.2025 18:37 — 👍 3    🔁 0    💬 0    📌 0

Bravo Jonathan !!!

14.04.2025 07:55 — 👍 7    🔁 3    💬 0    📌 0

PRIX DE THESE #SF2A 2025: Le conseil de la SF2A a l'honneur de décerner le prix de thèse 2025 à Giulia Pagnini pour sa thèse: "L'évolution précoce et tardive de notre Galaxie à travers la lentille des amas globulaires", au laboratoire GEPI, observatoire de Paris, sous la direction de P. Di Matteo.

12.04.2025 06:58 — 👍 10    🔁 7    💬 1    📌 0
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PRIX JEUNE CHERCHEUR 2025 DE LA #SF2A
Le conseil de la SF2A a l'honneur de décerner le prix jeune chercheur - jeune chercheuse 2025 à Jonathan Freundlich, maître de conférence à l'observatoire astronomique de Strasbourg @obsstrasbourg.bsky.social pour ses recherches sur l'évolution des galaxies.

12.04.2025 06:52 — 👍 13    🔁 6    💬 1    📌 1

Same Grey weather in Strasbourg...

29.03.2025 11:48 — 👍 0    🔁 0    💬 0    📌 0
ESASky 7.3.1 ESASky is an application that allows you to visualise and download public astronomical data from space-based missions.

Direct links to #Euclid #ESASky:

Euclid Deep Field South: sky.esa.int/esasky/?hide...

Euclid Deep Field North: sky.esa.int/esasky/?hide...

Euclid Deep Field Fornax: sky.esa.int/esasky/?targ...

#astronomy #space @esa.int

2/2

19.03.2025 12:06 — 👍 23    🔁 13    💬 1    📌 2
Preview
Q1 Day – Euclid’s First ‘Quick’ Data Release Today is Q1 Day! This means the first public release of data from the full Euclid Survey. It's only a very small portion (0.4%) of the survey - just 63 square degrees on the sky, while the full survey will be over 14,000 square degrees - but in contrast to earlier data releases, this has been passed through the full Euclid Ground Segment so it represents the true quality of the data we can expect for the rest of the mission.

Q1 Day – Euclid’s First ‘Quick’ Data Release

Today is Q1 Day! This means the first public release of data from the full Euclid Survey. It's only a very small portion (0.4%) of the survey - just 63 square degrees on the sky, while the full survey will be over 14,000 square degrees - but in contrast…

19.03.2025 11:05 — 👍 12    🔁 5    💬 0    📌 0

No MJD?

13.03.2025 20:26 — 👍 0    🔁 0    💬 2    📌 0
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This little cute ball of fur has managed to cure my super high level of stress in half an hour... Cats are the best!

26.02.2025 19:52 — 👍 15    🔁 0    💬 0    📌 0

Bonjour tout le monde, ceci est le tout nouveau compte de la Société Française d'Astronomie et d'Astrophysique. Nous espérons vous retrouver nombreux ici !

06.02.2025 16:26 — 👍 18    🔁 6    💬 5    📌 2

Bonjour @sf2a.bsky.social!

06.02.2025 16:24 — 👍 1    🔁 0    💬 2    📌 0

Thanks for co-organizing this workshop. Lots of interesting discussion, a very collaborative spirit, and lots of scientific puzzles to solve together. Science should always be like this!

07.12.2024 10:45 — 👍 3    🔁 0    💬 0    📌 0

10 min ;)

02.12.2024 12:19 — 👍 1    🔁 0    💬 0    📌 0

It was a z<6 astronomer. So, it works 😬

02.12.2024 08:18 — 👍 1    🔁 0    💬 1    📌 0

C'était la seconde, mais le train du matin était quand même plein de costards-cravates.

02.12.2024 07:08 — 👍 0    🔁 0    💬 0    📌 0

A businessman is seated next to a scientist. Another businessman comes claiming it is its seat. While the scientist checks the ticket again, the seated business makes a remark about people seated at the wrong spot... before realizing he was on the wrong spot. 2 jobs with different cultures of doubt.

02.12.2024 06:30 — 👍 2    🔁 0    💬 2    📌 0
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Quelqu'un s'est fait plaisir en écrivant la notice décrivant les exclusion de garantie d'une assurance. En tant que physicien, je ne suis pas trop inquiet...

24.11.2024 17:08 — 👍 2    🔁 0    💬 0    📌 0

Thanks for this list. Can you add me?

24.11.2024 08:31 — 👍 1    🔁 0    💬 1    📌 0

The CONCERTO twin doctors were amazing 👏 It was so great to work with them and witness them growing as scientists.

29.11.2023 22:27 — 👍 0    🔁 0    💬 0    📌 0

And thanks again to the ALMA observatory for the beautiful data. These are only partially observed programs (~20%). Imagine what we could do at full depth! I really hope that we will ultimately be lucky and that one day the 500pc observations of VC875 will be completed...

21.11.2023 16:08 — 👍 4    🔁 0    💬 0    📌 0

Lots of thing could happen (starbursts timescale shorter than the mergers, inefficient of mergers to trigger starbursts, selection effect...). A lot more needs to be done both on the observational and simulation side... Stay tuned!

21.11.2023 16:07 — 👍 2    🔁 0    💬 1    📌 0
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The final result is there. Our object lies on the high-end of the relation found at lower redshift, but well-below high-z starbursts (red, brown). Despite their morpho-kinematics, our sample is thus not behaving as the extreme bursts studied before at this z. Why?

21.11.2023 16:06 — 👍 3    🔁 0    💬 1    📌 0

This involves a couple of technicallities concerning the uncertainties. Please read the paper for more details...

21.11.2023 16:06 — 👍 2    🔁 0    💬 1    📌 0
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So far, it sounds great, but there is still a step. In many pixels, the SNR of the IR+UV SFR measurements is pretty bad. There is thus a flattening in KS relation at the low end in some object. It is artificial. To correct for it, we used averaged values per regions.

21.11.2023 16:06 — 👍 2    🔁 0    💬 1    📌 0

We can remark that most of these sources are clearly not nice smooth disks as our star-forming spirals in the local Universe. You can also see that the UV and the IR does not see the same regions, since dust attenuation is varying a lot in these systems.

21.11.2023 16:05 — 👍 2    🔁 0    💬 1    📌 0
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Before discussing the astrophysics, I would just like to show our images. We see literally how the gas is distributed in galaxies 1 billions of years after the recombination. In bonus, I added VC875 observation at intermediate resolution observed after the master project.

21.11.2023 16:05 — 👍 2    🔁 0    💬 1    📌 0

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