Romain A. Meyer
@astro_rameyer
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Maître-Assistant @obsge - Studying the Universe in the 1st Gyr: Galaxies, SMBH, Reionisation - All views are my own. (he/him) @astrorameyer.bsky.social
Joined April 2019
Well, I'm leaving. See you on blue sky or in real life!.
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RT @Introspect_Rych: Just wanted to quickly advertise a really exciting new result just obtained by ALMA involving the detection (6.6 sigma….
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RT @astrodomjt: The #ALMABO24 conference in Bologna kickstarts with a Local Galaxies session in the Giorgio Prodi lecture hall and just tak….
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RT @astro_rameyer: Are you an ECR? Do you like #JWST ? High-z galaxies/SMBHs? Skiing/curling/ice-skating in the Swiss Alps?. Applications a….
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RT @cadc_meetbot: 54th Saas-Fee Advanced Course: “Galaxies and Black Holes in the First Billion Years as seen with the JWST”: Date. Monday….
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Are you an ECR? Do you like #JWST ? High-z galaxies/SMBHs? Skiing/curling/ice-skating in the Swiss Alps?. Applications are now open for the 54th Saas-Fee Course on "Galaxies and Black Holes in the 1 Gyr as seen with the JWST" - Jan 27-31, 2025 - more info:
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Grant rejection, observing proposal rejections, and the childcare place suddenly closing down for good. And it's only Wednesday! 😭😭.
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Never complain again about JWST/ALMA being oversubscribed: "The number of hours requested by proposals in period 114 on UT4 amounted to 28.7 the available time" 🤯🤯🤯.
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RT @claudiacicone: A&A letter led by @aliceschimek: we explored FIR line ratios involving [CII]158, [OIII]88, [OIII]52, [NII].122 and [NIII….
arxiv.org
Optical emission line diagnostics, which are a common tool to constrain the properties of the interstellar medium (ISM) of galaxies, become progressively inaccessible at higher redshifts for...
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RT @NotaAntonella: Dropped on arXiv today "The First Billion Years, according to JWST" a snapshot of the great progress made by JWST in th….
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RT @AllPlanets: Io, satellite of Jupiter, seen in visible band with an adaptive optics system on the Large Binocular Telescope located in A….
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RT @ESA_Webb: 🆕 Webb has found a galaxy observed just 290 million years after the Big Bang! 💥 .Read more: or 🧵👇 htt….
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Tagging some of the FRESCO team members I could still find here: @Introspect_Rych @Rohan_Naidu @jorryt_m @DrJMatharu @OeschPascal @gbrammer @Thomerard.
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Let me finish this thread by thanking the FRESCO team without which this would not be possible, as well as everyone who has contributed and/or contributes to making JWST a phenomenal observatory for high-redshift science.
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With a nominal escape fraction of ionising photons of 10%, we find that FRESCO detects (with spectroscopic redshifts!) galaxies accounting for ~10% of budget of reionisation. We are very close to finding the sources of reionisation!
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There are many more things to discuss, but let's finish with a pet peeve of mine - reionisation. With the [OIII] and the negligible dust attenuation, we can compute directly the ionising emissivity of [OIII] detected by FRESCO. This bypasses the usual UVLF+xi_ion approach.
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Another cool result comes when combining the slitless spectroscopy of FRESCO (F444W) with CONGRESS (F356) in GN. This gives the median-stacked rest-frame optical spectrum of these objects. We infer low metallicities, medium-high ionisation, and negligible dust attenuation.
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