A. Saintonge
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View article: Linking Electron Density with Elevated Star Formation Activity from <i>z</i> = 0 to <i>z</i> = 10
Linking Electron Density with Elevated Star Formation Activity from <i>z</i> = 0 to <i>z</i> = 10 Open
The interstellar medium in high-redshift galaxies exhibits significantly higher electron densities ( n e ) than in the local Universe. To investigate the origin of this trend, we analyze a sample of 9590 centrally star-forming galaxies wit…
View article: A Comprehensive Characterization of Galaxy-cool CGM Connections at <i>z</i> < 0.4 with DESI Year 1 Data
A Comprehensive Characterization of Galaxy-cool CGM Connections at <i>z</i> < 0.4 with DESI Year 1 Data Open
We investigate the relationships between the cool circumgalactic medium (CGM), traced by Ca ii absorption lines, and galaxy properties at z < 0.4 using ∼900,000 galaxy–quasar pairs within 200 kpc from the Year 1 data of the Dark Energy Spe…
View article: What is the True HI Gas Content in Massive Quiescent Galaxies in the Local Universe?
What is the True HI Gas Content in Massive Quiescent Galaxies in the Local Universe? Open
While massive quiescent galaxies are known to be poor in atomic hydrogen (HI), their true HI content remains poorly constrained due to the limited sensitivity and morphological biases of existing surveys. We present deep HI observations us…
View article: MIGHTEE-H <scp>i</scp> : the direct detection of neutral hydrogen in galaxies at <i>z</i> &gt; 0.25
MIGHTEE-H <span>i</span> : the direct detection of neutral hydrogen in galaxies at <i>z</i> > 0.25 Open
Atomic hydrogen constitutes the gas reservoir from which molecular gas and star formation in galaxies emerges. However, the weakness of the line means it has been difficult to directly detect in all but the very local Universe. Here, we pr…
View article: Vz-GAL: Probing Cold Molecular Gas in Dusty Star-forming Galaxies at z=1-6
Vz-GAL: Probing Cold Molecular Gas in Dusty Star-forming Galaxies at z=1-6 Open
We present the first results of Vz-GAL, a high-redshift CO(J=1-0) large survey with the Karl G. Jansky Very Large Array, targeting 92 Herschel-selected, infrared-luminous, dusty star-forming galaxies (DSFGs) at redshifts 1 to 6. These sour…
View article: Dwarf galaxy halo masses from spectroscopic and photometric lensing in DESI and DES
Dwarf galaxy halo masses from spectroscopic and photometric lensing in DESI and DES Open
We present the most precise and lowest-mass weak lensing measurements of dwarf galaxies to date, enabled by spectroscopic lenses from the Dark Energy Spectroscopic Instrument (DESI) and photometric lenses from the Dark Energy Survey (DES) …
View article: Bright [CII]158$μ$m Streamers as a Beacon for Giant Galaxy Formation in SPT2349$-$56 at $z=4.3$
Bright [CII]158$μ$m Streamers as a Beacon for Giant Galaxy Formation in SPT2349$-$56 at $z=4.3$ Open
Observations of extreme starbursts, often located in the cores of protoclusters, challenge the classical bottom-up galaxy formation paradigm. Giant elliptical galaxies at $z=0$ must have assembled rapidly, possibly within few 100 Myr throu…
View article: The MALATANG survey: Dense gas distribution on sub-kiloparsec scales across the disk of M82
The MALATANG survey: Dense gas distribution on sub-kiloparsec scales across the disk of M82 Open
We present observations of HCN J = 4−3 and HCO + J = 4−3 lines obtained with the James Clerk Maxwell Telescope as part of the MALATANG survey, combined with archival HCN J = 1−0 and HCO + J = 1−0 data from the Green Bank Telescope, to stud…
View article: <scp>edge</scp>: the emergence of dwarf galaxy scaling relations from cosmological radiation-hydrodynamics simulations
<span>edge</span>: the emergence of dwarf galaxy scaling relations from cosmological radiation-hydrodynamics simulations Open
We present a new suite of edge (‘Engineering Dwarfs at Galaxy formation’s Edge’) cosmological zoom simulations. The suite includes 15 radiation-hydrodynamical dwarf galaxies covering the ultrafaint to the dwarf irregular regime ($10^4 \le …
View article: Identifying Anomalous DESI Galaxy Spectra with a Variational Autoencoder
Identifying Anomalous DESI Galaxy Spectra with a Variational Autoencoder Open
The tens of millions of spectra being captured by the Dark Energy Spectroscopic Instrument (DESI) provide tremendous discovery potential. In this work we show how Machine Learning, in particular Variational Autoencoders (VAE), can detect a…
View article: MIGHTEE-HI: The direct detection of neutral hydrogen in galaxies at $z>0.25$
MIGHTEE-HI: The direct detection of neutral hydrogen in galaxies at $z>0.25$ Open
Atomic hydrogen constitutes the gas reservoir from which molecular gas and star formation in galaxies emerges. However, the weakness of the line means it has been difficult to directly detect in all but the very local Universe. Here we pre…
View article: Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Resolving the hot and ionized Universe through the Sunyaev-Zeldovich effect
Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Resolving the hot and ionized Universe through the Sunyaev-Zeldovich effect Open
An omnipresent feature of the multi-phase “cosmic web” — the large-scale filamentary backbone of the Universe — is that warm/hot (≳ 105 K) ionized gas pervades it. This gas constitutes a relevant contribution to the overall universal matte…
View article: Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Gas and dust in nearby galaxies
Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Gas and dust in nearby galaxies Open
Understanding the physical processes that regulate star formation and galaxy evolution are major areas of activity in modern astrophysics. Nearby galaxies offer unique opportunities to inspect interstellar medium (ISM), star formation (SF)…
View article: The molecular gas content throughout the low-z merger sequence
The molecular gas content throughout the low-z merger sequence Open
Exploiting IRAM 30 m CO spectroscopy, we find that SDSS post-merger galaxies display gas fractions and depletion times enhanced by 25-50%, a mildly increased CO excitation, and standard molecular-to-atomic gas ratios, compared to non-inter…
View article: The HASHTAG project II. Giant molecular cloud properties across the M31 disc
The HASHTAG project II. Giant molecular cloud properties across the M31 disc Open
We present a study of giant molecular cloud (GMC) properties in the Andromeda galaxy (M31) using CO(3-2) data from the James Clerk Maxwell Telescope (JCMT) in selected regions across the disc and in the nuclear ring, and comparing them wit…
View article: Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Our Galaxy
Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Our Galaxy Open
As we learn more about the multi-scale interstellar medium (ISM) of our Galaxy, we develop a greater understanding for the complex relationships between the large-scale diffuse gas and dust in Giant Molecular Clouds (GMCs), how it moves, h…
View article: Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Probing the transient and time-variable sky
Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Probing the transient and time-variable sky Open
The study of transient and variable events, including novae, active galactic nuclei, and black hole binaries, has historically been a fruitful path for elucidating the evolutionary mechanisms of our universe. The study of such events in th…
View article: Atacama Large Aperture Submillimeter Telescope (AtLAST) Science: Planetary and Cometary Atmospheres
Atacama Large Aperture Submillimeter Telescope (AtLAST) Science: Planetary and Cometary Atmospheres Open
The study of planets and small bodies within our Solar System is fundamental for understanding the formation and evolution of the Earth and other planets. Compositional and meteorological studies of the giant planets provide a foundation f…
View article: Science development study for the Atacama Large Aperture Submillimeter Telescope (AtLAST): Solar and stellar observations
Science development study for the Atacama Large Aperture Submillimeter Telescope (AtLAST): Solar and stellar observations Open
Observations at (sub-)millimeter wavelengths offer a complementary perspective on our Sun and other stars, offering significant insights into both the thermal and magnetic composition of their chromospheres. Despite the fundamental progres…
View article: The atomic gas sequence and mass–metallicity relation from dwarfs to massive galaxies
The atomic gas sequence and mass–metallicity relation from dwarfs to massive galaxies Open
Galaxy scaling relations provide insights into the processes that drive galaxy evolution. The extension of these scaling relations into the dwarf galaxy regime is of particular interest. This is because dwarf galaxies represent a crucial s…
View article: Value-added catalog of physical properties for more than 1.3 million galaxies from the DESI survey
Value-added catalog of physical properties for more than 1.3 million galaxies from the DESI survey Open
Aims. We present an extensive catalog of the physical properties of more than a million galaxies investigated with the Dark Energy Spectroscopic Instrument (DESI), one of the largest spectroscopic surveys to date. Spanning a full range of …
View article: A Break in the Size–Stellar Mass Relation: Evidence for Quenching and Feedback in Dwarf Galaxies
A Break in the Size–Stellar Mass Relation: Evidence for Quenching and Feedback in Dwarf Galaxies Open
Mapping stars and gas in nearby galaxies is fundamental for understanding their growth and the impact of their environment. This issue is addressed by comparing the stellar “edges” of galaxies D stellar , defined as the outermost diameter …
View article: Value Added Catalog of physical properties of more than 1.3 million galaxies from the DESI Survey
Value Added Catalog of physical properties of more than 1.3 million galaxies from the DESI Survey Open
Aims. We present an extensive catalog of the physical properties of more than a million galaxies within the Dark Energy Spectroscopic Instrument (DESI), one of the largest spectroscopic surveys to date. Spanning over a full variety of targ…
View article: The molecular gas content throughout the low-z merger sequence
The molecular gas content throughout the low-z merger sequence Open
Exploiting IRAM 30m CO spectroscopy, we find that SDSS post-merger galaxies display gas fractions and depletion times enhanced by 25-50%, a mildly higher CO excitation, and standard molecular-to-atomic gas ratios, compared to non-interacti…
View article: JWST MIRI and NIRCam observations of NGC 891 and its circumgalactic medium
JWST MIRI and NIRCam observations of NGC 891 and its circumgalactic medium Open
We present new JWST observations of the nearby, prototypical edge-on, spiral galaxy NGC 891. The northern half of the disk was observed with NIRCam in its F150W and F277W filters. Absorption is clearly visible in the mid-plane of the F150W…
View article: A Break In the Size-Stellar Mass Relation: Evidence for Quenching and Feedback in Dwarf Galaxies
A Break In the Size-Stellar Mass Relation: Evidence for Quenching and Feedback in Dwarf Galaxies Open
Mapping stars and gas in nearby galaxies is fundamental for understanding their growth and the impact of their environment. This issue is addressed by comparing the stellar "edges" of galaxies $D_{\rm stellar}$, defined as the outermost di…
View article: The key science drivers for the Atacama Large Aperture Submillimeter Telescope (AtLAST)
The key science drivers for the Atacama Large Aperture Submillimeter Telescope (AtLAST) Open
Sub-mm and mm wavelengths provide a unique view of the Universe, from the gas and dust that fills and surrounds galaxies to the chromosphere of our own Sun. Current single-dish facilities have presented a tantalising view of the brightest …
View article: The atomic gas sequence and mass-metallicity relation from dwarfs to massive galaxies
The atomic gas sequence and mass-metallicity relation from dwarfs to massive galaxies Open
Galaxy scaling relations provide insights into the processes that drive galaxy evolution. The extension of these scaling relations into the dwarf galaxy regime is of particular interest. This is because dwarf galaxies represent a crucial s…
View article: Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Gas and dust in nearby galaxies
Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Gas and dust in nearby galaxies Open
Understanding the physical processes that regulate star formation and galaxy evolution are major areas of activity in modern astrophysics. Nearby galaxies offer unique opportunities to inspect interstellar medium (ISM), star formation (SF…
View article: Science development study for the Atacama Large Aperture Submillimeter Telescope (AtLAST): Solar and stellar observations
Science development study for the Atacama Large Aperture Submillimeter Telescope (AtLAST): Solar and stellar observations Open
Observations at (sub-)millimeter wavelengths offer a complementary perspective on our Sun and other stars, offering significant insights into both the thermal and magnetic composition of their chromospheres. Despite the fundamental progres…