Michaela Hirschmann

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RUBIES Reveals a Massive Quiescent Galaxy at z=7.3

Michaela Hirschmann

We report the spectroscopic discovery of a massive quiescent galaxy at z(spec) = 7.29 +/- 0.01, just similar to 700 Myr after the big bang. RUBIES-UDS-QG-z7 was selected from public JWST/NIRCam and MIRI imaging from the PRIMER survey and observed with JWST ...

IOP Publishing Ltd2025

You Shall Not Pass! The Propagation of Low-/Moderate-powered Jets Through a Turbulent Interstellar Medium

Michaela Hirschmann

Feedback from black-hole-powered jets has been invoked in many cosmological simulations to regulate star formation and quench galaxies. Despite this, observational evidence of how jets might be able to affect their hosts remains scarce, especially for low- ...

IOP Publishing Ltd2025

Gas Outflows in Two Recently Quenched Galaxies at z=4 and 7

Michaela Hirschmann

Outflows are a key element in the baryon cycle of galaxies, impacting their evolution by extracting gas, momentum, and energy and then injecting them into the surrounding medium. The properties of gas outflows provide a fundamental test for our models of h ...

EDP SCIENCES S A2025

Clumps as multiscale structures in cosmic noon galaxies

Michaela Hirschmann

Star-forming clumps have been found to significantly influence the star formation of gas-rich z > 1 galaxies. Using public data from JWST/NIRCam (Cosmic Evolution Survey; COSMOS-Web) and Atacama Large (sub-)Millimeter Array (ALMA; Fiber-Multi Object Spectr ...

OXFORD UNIV PRESS2025

COSMOS-Web: The Role of Galaxy Interactions and Disk Instabilities in Producing Starbursts at z < 4

Pascale Jablonka, Michaela Hirschmann

We study of the role of galaxy-galaxy interactions and disk instabilities in producing starburst activity in galaxies out to z = 4. For this, we use a sample of 387 galaxies with robust total star formation rate measurements from Herschel, gas masses from ...

2025

RUBIES: A complete census of the bright and red distant Universe with JWST/NIRSpec

Michaela Hirschmann

We present the Red Unknowns: Bright Infrared Extragalactic Survey (RUBIES) providing JWST/NIRSpec spectroscopy of red sources selected across ∼150 arcmin2 from public JWST/NIRCam imaging in the UDS and EGS fields. The novel observing strategy of RUBIES off ...

2025

Molecular gas and dust properties in z > 7 quasar hosts

Michaela Hirschmann

Observational campaigns hunting the elusive reservoirs of cold gas in the host galaxies of quasars at the epoch of reionization (EoR) are crucial for studying the formation and evolution of the first massive systems at early epochs. We present new Northern ...

EDP SCIENCES S A2025

The Rise of Faint, Red Active Galactic Nuclei at z > 4: a Sample of Little Red Dots in the Jwst Extragalactic Legacy Fields

Michaela Hirschmann

We present a sample of 341 "little red dots" (LRDs) spanning the redshift range z similar to 2-11 using data from the CEERS, PRIMER, JADES, UNCOVER, and NGDEEP surveys. Unlike past use of color indices to identify LRDs, we employ continuum slope fitting us ...

IOP Publishing Ltd2025

CAPERS Observations of Two UV-bright Galaxies at z > 10. More Evidence for Bursting Star Formation in the Early Universe

Michaela Hirschmann

We present the first results from the CANDELS-Area Prism Epoch of Reionization Survey (CAPERS), utilizing PRISM observations with the JWST/NIRSpec microshutter assembly in the PRIMER-UDS field. With just 14% of the total planned data volume, we spectroscop ...

2025

Here There Be (dusty) Monsters: High-redshift Active Galactic Nuclei Are Dustier Than Their Hosts

Michaela Hirschmann

JWST spectroscopy has discovered a population of z greater than or similar to 3.5 galaxies with broad Balmer emission lines and narrow forbidden lines that are consistent with hosting active galactic nuclei (AGN). Many of these systems, now known as "littl ...

IOP Publishing Ltd2025

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The Rise of Faint, Red Active Galactic Nuclei at z > 4: a Sample of Little Red Dots in the Jwst Extragalactic Legacy Fields

Michaela Hirschmann

IOP Publishing Ltd2025