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Reposted by Jorryt Matthee

Sarah Kendrew @sarahkendrew.bsky.social · 17/08/2026

Astronomers! STScI just advertised vacancies for ESA/AURA Astronomer positions. These are 50/50 mission support/research positions, funded by ESA via an AURA contract (so you don't need to be an ESA member state citizen). Full details here: recruiting2.ultipro.com/SPA1004AURA/...

recruiting2.ultipro.com

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Jorryt Matthee @jorryt.bsky.social · 19/03/2026

Paper Day! You may have heard about these "Little Red Dots" in JWST data. Here we use new high quality spectra to show that the their spectral appearance is primarily determined by the properties of surrounding gas. LRDs are hot engines covered by dense gas arxiv.org/abs/2603.17667

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Jorryt Matthee @jorryt.bsky.social · 06/02/2026

One of the main conclusions so far is that a majority in the room thinks the powering engine in little red dots should be called quasars (and that the class of objects historically known as quasars could perhaps be called DABs; disk accreting black holes).

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Reposted by Jorryt Matthee

Wendy Sun @wendysun.bsky.social · 01/02/2026

Paper day!! Little Red Dots (LRDs) are seen everywhere by JWST, but even after 3 years of relentless effort we are still debating what these things actually are. We decompose LRDs to show LRD - Host Galaxy = Black Hole Star (BH*)! 🧵 arxiv.org/abs/2601.20929 🔭 🧪

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Reposted by Jorryt Matthee

Emily Hunt @emily.space · 05/01/2026

Vienna has a lively astronomy department - consider applying to the below if you'd be interested in a four year (!!) position here: 🔭☄️

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Jorryt Matthee @jorryt.bsky.social · 04/12/2025

Happy to share my introductory review article "JWST provides a new view of cosmic dawn: latest developments in studies of early galaxies" has now been published in Contemporary Physics! www.tandfonline.com/doi/full/10.... arxiv.org/abs/2511.04843

tandfonline.com

JWST provides a new view of cosmic dawn: latest developments in studies of early galaxies

Studies of the distant Universe are providing key insights into our understanding of the formation of galaxies. The advent of the James Webb Space Telescope (JWST) has significantly enhanced our ob...

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Jorryt Matthee @jorryt.bsky.social · 31/10/2025

Time to spotlight the first paper of my PhD student Gauri Kotiwale that appeared on arXiv last week: Rapid, out of equilibrium metal enrichment indicated by a flat mass-metallicity relation at z ∼ 6 from NIRCam grism spectroscopy arxiv.org/abs/2510.19959

arxiv.org

Rapid, out of equilibrium metal enrichment indicated by a flat mass-metallicity relation at z~6 from NIRCam grism spectroscopy

We aim to characterise the mass-metallicity relation (MZR) and the 3D correlation between stellar mass, metallicity and star-formation rate (SFR) known as the fundamental metallicity relation (FMR) fo...

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Jorryt Matthee @jorryt.bsky.social · 28/10/2025

Delayed paper day! In work lead by my postdoc Claudia Di Cesare as part of the ALT survey, we provide a detailed census of the so-called star formation main sequence in the early Universe. arxiv.org/pdf/2510.19044

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Jorryt Matthee @jorryt.bsky.social · 03/10/2025

Delayed paper day! arxiv.org/abs/2510.00103 Led by Alberto Torralba, who is a postdoc in my group, we present the highest quality spectrum of a "Little Red Dot" yet known. This unveils new insights in the warm, dense layer of gas that is key to explain the most unusual spectral features of the LRDs!

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Jorryt Matthee @jorryt.bsky.social · 19/05/2025

We found the most distant confirmed galaxy (some Sergej Boebka vibes 😅) arxiv.org/abs/2505.11263

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Jorryt Matthee @jorryt.bsky.social · 09/12/2024

More exciting measurements on the most luminous little red dot that I know of (F444W=22 at z=4.5!): an unambiguous AGN and a Balmer break in deep UNCOVER and ALT spectroscopy, led by Ivo Labbe arxiv.org/abs/2412.04557

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Jorryt Matthee @jorryt.bsky.social · 06/12/2024

Yesterday was paper day! With deep JWST data from the ALT survey we provide new independent evidence that the new population of faint AGNs in the early Universe seems to have so-called overly massive black holes compared to their stellar mass arxiv.org/abs/2412.02846

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Jorryt Matthee @jorryt.bsky.social · 08/11/2023

My institute ISTA in the nice Viennese forest in Austria now calls for PhD applications, deadline Jan 8 2024. Fully funded ~5 yr US style Grad School. Multiple positions in Astronomy are available. Please distribute and contact me for details! phd.pages.ist.ac.at

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Jorryt Matthee @jorryt.bsky.social · 26/09/2023

If you think MUSE is already oversubscribed, imagine that there will only be one ELT (instead of 4 UTs), which will have various instruments to commission when others can already observe. 😬

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Jorryt Matthee @jorryt.bsky.social · 04/09/2023

Hello Blue Sky! Very happy and grateful to be starting a research group in extragalactic astronomy and contribute to the development of astronomy at ISTA (ista.ac.at) as of this september!

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