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Michaela Hirschmann

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Publications associées (87)

Unveiling the Dark Side of Ultraviolet/Optical Bright Galaxies: Optically Thick Dust Absorption

Michaela Hirschmann

Over the past decades, a population of galaxies invisible in optical/near-infrared (NIR), but bright at longer wavelengths, have been identified through color selections. These so-called optically faint/dark galaxies are considered to be massive quiescent ...

2025

The Impact of Ram Pressure on Cluster Galaxies, Insights From Gaea and Tng

Michaela Hirschmann

Ram pressure stripping (RPS) has a non-negligible impact on the gas content of cluster galaxies. We used the semi-analytic model GAEA and the hydro-simulation TNG to investigate whether cluster galaxies suffer from strong RPS that is sufficient to remove a ...

EDP SCIENCES S A2025

Characterising the z ≈ 7.66 Type-II AGN candidate SMACS S06355 using BEAGLE-AGN and JWST NIRSpec/NIRCam

Michaela Hirschmann, Adèle Marie Françoise Plat

The presence of Active Galactic Nuclei (AGN) in low mass (M⋆ ≲ 109 M⊙) galaxies at high redshift has been established, and it is important to characterise these objects and the impact of their feedback on the host galaxies. In this paper we apply the Spect ...

Oxford University Press (OUP)2025

RUBIES: JWST/NIRSpec Resolves Evolutionary Phases of Dusty Star-forming Galaxies at z ∼ 2

Michaela Hirschmann

The dearth of high-quality spectroscopy of dusty star-forming galaxies (DSFGs)-the main drivers of the assembly of dust and stellar mass at the peak of activity in the Universe-greatly hinders our ability to interpret their physical processes and evolution ...

IOP Publishing Ltd2025

Euclid I. Overview of the Euclid mission

Yves Revaz, Georges Meylan, Frédéric Courbin, Pascale Jablonka, Jean-Paul Richard Kneib, Austin Chandler Peel, Michaela Hirschmann, Lucie Anemone Scharré

The current standard model of cosmology successfully describes a variety of measurements, but the nature of its main ingredients, dark matter and dark energy, remains unknown. Euclid is a medium-class mission in the Cosmic Vision 2015–2025 programme of the ...

2025

The Ionizing Photon Production Efficiency of Star-forming Galaxies at z ∼ 4-10

Michaela Hirschmann

Context. Investigating the ionizing emission of star-forming galaxies and the escape fraction of ionizing photons is critical to understanding their contribution to reionization and their impact on the surrounding environment. The number of ionizing photon ...

EDP SCIENCES S A2025

A Merging Pair of Massive Quiescent Galaxies at z=3.44 in the Cosmic Vine

Michaela Hirschmann

We report the spectroscopic confirmation of a merging pair of massive quiescent galaxies at z = 3.44. Using JWST observations, we confirm that the two galaxies lie at a projected separation of 4.5 kpc with a velocity offset of similar to 680 km s(-1) (delt ...

EDP SCIENCES S A2025

Magnetic field morphology and evolution in the Central Molecular Zone and its effect on gas dynamics

Michaela Hirschmann, Robin Gopala Tress

The interstellar medium in the Milky Way's Central Molecular Zone (CMZ) is known to be strongly magnetised, but its large-scale morphology and impact on the gas dynamics are not well understood. We explore the impact and properties of magnetic fields in th ...

EDP SCIENCES S A2024

Crimson Behemoth: A massive clumpy structure hosting a dusty AGN at z =4.91

Michaela Hirschmann

The current paradigm for the co-evolution of galaxies and their supermassive black holes postulates that dust-obscured active galactic nuclei (AGNs) represent a transitional phase towards a more luminous and unobscured state. However, our understanding of ...

OXFORD UNIV PRESS2024

ASTRODEEP-JWST: NIRCam-HST multi-band photometry and redshifts for half a million sources in six extragalactic deep fields

Michaela Hirschmann

Aims. We present a set of photometric catalogues primarily aimed at providing the community with a comprehensive database for the study of galaxy populations in the high-redshift Universe. The set gathers data from eight JWST NIRCam observational programs, ...

EDP SCIENCES S A2024

On the origin of globular clusters in a hierarchical universe

Michaela Hirschmann

We present an end-to-end description of the formation of globular clusters (GCs) combining a treatment for their formation and dynamical evolution within galaxy haloes with a state-of-the-art semi-analytic simulation of galaxy formation. Our approach allow ...

2024

Evidence for a Shallow Evolution in the Volume Densities of Massive Galaxies at z = 4-8 from CEERS

Michaela Hirschmann

We analyze the evolution of massive (log10[M ⋆/M ⊙] > 10) galaxies at z ∼ 4-8 selected from JWST Cosmic Evolution Early Release Survey (CEERS). We infer the physical properties of all galaxies in the CEERS NIRCam imaging through spectral energy distributio ...

2024

Efficient NIRCam Selection of Quiescent Galaxies at 3 < z < 6 in CEERS

Michaela Hirschmann

Substantial populations of massive quiescent galaxies at z ≥ 3 challenge our understanding of rapid galaxy growth and quenching over short timescales. In order to piece together this evolutionary puzzle, more statistical samples of these objects are requir ...

2024

What Are the Pillars of Reionization? Revising the AGN Luminosity Function at z ∼ 5

Michaela Hirschmann

In the past, high-z active galactic nuclei (AGNs) were given a minor role as possible drivers of reionization, despite initial evidence in favor of their large space densities at low luminosities by Chandra and the Hubble Space Telescope. Recent observatio ...

IOP Publishing Ltd2024

Physical properties of extreme emission-line galaxies at z~4-9 from the JWST CEERS survey

Michaela Hirschmann

Context. Extreme emission line galaxies (EELGs) are typically characterized by high equivalent widths (EWs) which are driven by elevated specific star formation rates (sSFRs) in low-mass galaxies with subsolar metallicities and little dust. Such extreme sy ...

2024

On the origin of star formation quenching in massive galaxies at z ≳ 3 in the cosmological simulations Illustris TNG

Michaela Hirschmann

Using the cosmological simulations IllustrisTNG, we perform a comprehensive analysis of quiescent, massive galaxies at z ≳ 3. The goal is to understand what suppresses their star formation so early in cosmic time, and how other similar mass galaxies remain ...

2024

Evolution of the star formation rate and ΣSFR of galaxies at cosmic morning (4 < z < 10)

Michaela Hirschmann

The galaxy-integrated star formation rate (SFR) surface density measurement (ΣSFR) has been proposed as a valuable diagnostic of the mass accumulation in galaxies given it is more tightly related to the physics of star formation and stellar feedback than o ...

2024

CEERS: Diversity of Lyα Emitters during the Epoch of Reionization

Michaela Hirschmann

We analyze rest-frame ultraviolet to optical spectra of three z similar or equal to 7.47-7.75 galaxies whose Ly alpha emission lines were previously detected with Keck/MOSFIRE observations, using the JWST/NIRSpec observations from the Cosmic Evolution Earl ...

Iop Publishing Ltd2024

A Census from JWST of Extreme Emission-line Galaxies Spanning the Epoch of Reionization in CEERS

Michaela Hirschmann

We present a sample of 1165 extreme emission-line galaxies (EELGs) at 4 < z < 9 selected using James Webb Space Telescope (JWST) NIRCam photometry in the Cosmic Evolution Early Release Science (CEERS) program. We use a simple method to photometrically iden ...

2024

The Complete CEERS Early Universe Galaxy Sample: A Surprisingly Slow Evolution of the Space Density of Bright Galaxies at z ∼ 8.5-14.5

Michaela Hirschmann

We present a sample of 88 candidate z similar to 8.5-14.5 galaxies selected from the completed NIRCam imaging from the Cosmic Evolution Early Release Science survey. These data cover similar to 90 arcmin2 (10 NIRCam pointings) in six broadband imaging filt ...

Iop Publishing Ltd2024

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