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Matthieu Béthermin

@matbethermin.bsky.social
536 followers 354 following 58 posts

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.

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Reposted by Matthieu Béthermin
SF2A @sf2a.bsky.social · 25/05/2026
Suite aux délibérations du jury, nous avons le plaisir d’annoncer l’attribution du prix Gemini 2026 au projet BSN : « Binary Systems of South and North ». Cette collaboration internationale est portée par Atila Poro et par Patrick Wullaert. Le prix sera décerné lors des journées de la SF2A 2026.
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Matthieu Béthermin @matbethermin.bsky.social · 15/04/2026
C'est une Otto?
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Reposted by Matthieu Béthermin
SF2A @sf2a.bsky.social · 26/02/2026
Suite aux attaques et menaces dont a été victime notre collègue Éric Lagadec @ericlagadec.bsky.social, la SF2A réaffirme son attachement indéfectible à la liberté d’expression et aux libertés académiques, valeurs essentielles à l’exercice de la science et au débat démocratique. buff.ly/g1ZEJnH
sf2a.eu
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Société Astronomique de France @safastrofrance.bsky.social · 09/02/2026
📣 Appel à candidature pour le Prix Gemini 2026 ! La Société Astronomique de France (SAF) et la Société Française d’Astronomie et d’Astrophysique @sf2a.bsky.social lancent l’appel à candidature pour le #PrixGemini 2026 qui récompense les collaborations pro-am en #astronomie🔭* 👉🏻 tinyurl.com/k4nk7rhh
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Matthieu Béthermin @matbethermin.bsky.social · 04/12/2025
Je connaissais Karim depuis que je l'avais eu comme prof en M2 en 2007. C'était une figure de la cosmologie en France que je recroisais régulièrement. C'est tellement soudain et aléatoire. Mes pensées vont à ses proches dans cette terrible épreuve.
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Matthieu Béthermin @matbethermin.bsky.social · 17/07/2025
And is "pedagogy" is the new excuse for bold unfounded claims after "we need to catch the interest of the public"?
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Matthieu Béthermin @matbethermin.bsky.social · 17/07/2025
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
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Matthieu Béthermin @matbethermin.bsky.social · 02/06/2025
Bravo à la collaboration lauréate!
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Reposted by Matthieu Béthermin
SF2A @sf2a.bsky.social · 12/05/2025
📢 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
sf2a.eu
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Matthieu Béthermin @matbethermin.bsky.social · 24/04/2025
I was searching for the cat. There was a strange bump on the guest bed. I looked under and clearly disturbed someone's nap.
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Observatoire astronomique de Strasbourg @obsstrasbourg.bsky.social · 14/04/2025
Bravo Jonathan !!!
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SF2A @sf2a.bsky.social · 12/04/2025
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.
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SF2A @sf2a.bsky.social · 12/04/2025
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.
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Matthieu Béthermin @matbethermin.bsky.social · 29/03/2025
Same Grey weather in Strasbourg...
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Reposted by Matthieu Béthermin
Euclid Consortium @ec-euclid.bsky.social · 19/03/2025
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
sky.esa.int
ESASky 7.3.1
ESASky is an application that allows you to visualise and download public astronomical data from space-based missions.
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Reposted by Matthieu Béthermin
Peter Coles 🏳️‍🌈 🏳️‍⚧️ 🇮🇪 @telescoper.bsky.social · 19/03/2025
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…
telescoper.blog
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.
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Matthieu Béthermin @matbethermin.bsky.social · 13/03/2025
No MJD?
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Matthieu Béthermin @matbethermin.bsky.social · 26/02/2025
This little cute ball of fur has managed to cure my super high level of stress in half an hour... Cats are the best!
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Reposted by Matthieu Béthermin
SF2A @sf2a.bsky.social · 06/02/2025
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 !
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Matthieu Béthermin @matbethermin.bsky.social · 06/02/2025
Bonjour @sf2a.bsky.social!
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Matthieu Béthermin @matbethermin.bsky.social · 07/12/2024
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!
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Matthieu Béthermin @matbethermin.bsky.social · 02/12/2024
10 min ;)
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Matthieu Béthermin @matbethermin.bsky.social · 02/12/2024
It was a z<6 astronomer. So, it works 😬
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Matthieu Béthermin @matbethermin.bsky.social · 02/12/2024
C'était la seconde, mais le train du matin était quand même plein de costards-cravates.
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Matthieu Béthermin @matbethermin.bsky.social · 02/12/2024
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.
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Matthieu Béthermin @matbethermin.bsky.social · 24/11/2024
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...
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Matthieu Béthermin @matbethermin.bsky.social · 24/11/2024
Thanks for this list. Can you add me?
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Matthieu Béthermin @matbethermin.bsky.social · 29/11/2023
The CONCERTO twin doctors were amazing 👏 It was so great to work with them and witness them growing as scientists.
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Matthieu Béthermin @matbethermin.bsky.social · 21/11/2023
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...
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Matthieu Béthermin @matbethermin.bsky.social · 21/11/2023
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!
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Matthieu Béthermin @matbethermin.bsky.social · 21/11/2023
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?
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Matthieu Béthermin @matbethermin.bsky.social · 21/11/2023
This involves a couple of technicallities concerning the uncertainties. Please read the paper for more details...
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Matthieu Béthermin @matbethermin.bsky.social · 21/11/2023
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.
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Matthieu Béthermin @matbethermin.bsky.social · 21/11/2023
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.
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Matthieu Béthermin @matbethermin.bsky.social · 21/11/2023
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.
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Matthieu Béthermin @matbethermin.bsky.social · 21/11/2023
For the star formation rates, we combine the ALMA dust continuum (obscured SFR) and the rest-frame UV from Hubble conveniently redshifted in the F814W filter (unobscured UV). With that in hand, we can study the relation between the gas and the SFR surface density.
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Matthieu Béthermin @matbethermin.bsky.social · 21/11/2023
During their first-year 20-day master project, I suggested to Claire and Cédric to attempt to measure the Kennicutt-Schmidt relation in 3 objects observed by ALMA at high z. We chose to use [CII] as a gas tracer (too long debate for twitter).
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Matthieu Béthermin @matbethermin.bsky.social · 21/11/2023
Last week, our paper on the Kennicutt-Schmidt relation in normal star-forming galaxies has been accepted by A&A and posted on arxiv (arxiv.org/abs/2311.08474). I finally found the time for a thread. In collaboration with Cédric Accard, Claire Guillaume, and the ALPINE team!
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Matthieu Béthermin @matbethermin.bsky.social · 31/10/2023
Thanks for sharing. I am starting to wonder how often galaxies hide a faint radio AGN, which cannot be detected but bias the radio flux high. It would not be a good news for SKA... Anyway, soon we will be in the same situation for SFR as we are with cold gas estimates: MANY unreliable tracers. Yeah!
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Matthieu Béthermin @matbethermin.bsky.social · 30/10/2023
It was the end of à great season with a PR on the Strasbourg half marathon in May, 3 L distance triathlon (Obernai, Geneva, and Gerardmer) over the summer, and a marathon PR yesterday. Time to rest a bit and focus on the first Euclid spectra!
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Matthieu Béthermin @matbethermin.bsky.social · 26/10/2023
Wait! There are more complicated spectro surveys to reduce than the Euclid slitless cosmo survey? Good luck... It sounds VERY hard.
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Matthieu Béthermin @matbethermin.bsky.social · 25/10/2023
Congratulation! You really look like a Parisian intellectual on this picture.
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Matthieu Béthermin @matbethermin.bsky.social · 25/10/2023
Is it a Tour de France stage or a wine connoisseur pilgrimage?
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Reposted by Matthieu Béthermin
Karina Voggel @karinavoggel.bsky.social · 24/10/2023
The cat has reached new levels of cute, but the big black doll eyes are deceiving because she was hunting and ready to attack.
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Matthieu Béthermin @matbethermin.bsky.social · 18/10/2023
It went from maximizing the surface of exchange to minimizing it quickly. Winter is coming!
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Matthieu Béthermin @matbethermin.bsky.social · 08/10/2023
This Portugal-Fidji is such a great way to end the group stage of the rugby world cup. Who could have even thought about this possibility a month ago? 😳
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Matthieu Béthermin @matbethermin.bsky.social · 15/09/2023
I just tried hakarl (icelandic fermented shark). As a fench used to very strong and mature cheese, I felt that it was not so strong but very tasty. Am I weird?
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Matthieu Béthermin @matbethermin.bsky.social · 15/09/2023
I was expecting a Gaussian, but it looks more like a Lorentzian...
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Matthieu Béthermin @matbethermin.bsky.social · 15/09/2023
It is third indeed but autocorrect and frozen hands are a bad combo...
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Matthieu Béthermin @matbethermin.bsky.social · 14/09/2023
Thirty day in a row. It looks very strang with partial cloud coverage.
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