Jorryt Matthee
@jorryt.bsky.social
Extragalactic astrophysicist. Assistant Prof @ IST Austria - PI of ERC StG-2022 AGENTS. PhD Leiden 2018, Zwicky fellow @ ETH Zurich,2018-2023.
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/abs/2510.19959
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...
arxiv.org
October 31, 2025 at 10:53 AM
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/abs/2510.19959
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
October 28, 2025 at 11:02 AM
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
Where are you all now?
October 15, 2025 at 5:46 PM
Where are you all now?
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!
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!
October 3, 2025 at 7:54 AM
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!
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!
Reviving Paper Threads: Paper day for my PhD student Ivan Kramarenko at @istaresearch.bsky.social !
"Hydrogen-Alpha as a Tracer of Star Formation in the SPHINX Cosmological Simulations" arxiv.org/abs/2509.05403
1/...
"Hydrogen-Alpha as a Tracer of Star Formation in the SPHINX Cosmological Simulations" arxiv.org/abs/2509.05403
1/...
Hydrogen-Alpha as a Tracer of Star Formation in the SPHINX Cosmological Simulations
The Hydrogen-alpha (Ha) emission line in galaxies is a powerful tracer of their recent star formation activity. With the advent of JWST, we are now able to routinely observe Ha in galaxies at high red...
arxiv.org
September 9, 2025 at 4:05 PM
Reviving Paper Threads: Paper day for my PhD student Ivan Kramarenko at @istaresearch.bsky.social !
"Hydrogen-Alpha as a Tracer of Star Formation in the SPHINX Cosmological Simulations" arxiv.org/abs/2509.05403
1/...
"Hydrogen-Alpha as a Tracer of Star Formation in the SPHINX Cosmological Simulations" arxiv.org/abs/2509.05403
1/...
May 19, 2025 at 6:42 AM
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
arxiv.org/abs/2412.04557
December 9, 2024 at 6:34 PM
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
arxiv.org/abs/2412.04557
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
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
December 6, 2024 at 2:33 PM
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
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
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
phd.pages.ist.ac.at
November 8, 2023 at 8:30 AM
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
phd.pages.ist.ac.at
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. 😬
September 26, 2023 at 6:10 PM
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. 😬
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!
September 4, 2023 at 10:05 AM
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!