C. Ledoux
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View article: The cosmic web's Lyman-$α$ glow at $z \approx 2.5$; varying hydrodynamic models, dust, and wide-field, narrow-band imaging detection
The cosmic web's Lyman-$α$ glow at $z \approx 2.5$; varying hydrodynamic models, dust, and wide-field, narrow-band imaging detection Open
The diffuse glow of the cosmic web in Lyman-$α$ emission has long been predicted, yet remained elusive to direct wide field detection. We present theoretical calculations that, when compared with recent observations made using the Condor A…
View article: Spatially Resolved Circumgalactic Medium around a Star-forming Galaxy Driving a Galactic Outflow at <i>z</i> ≈ 0.8
Spatially Resolved Circumgalactic Medium around a Star-forming Galaxy Driving a Galactic Outflow at <i>z</i> ≈ 0.8 Open
We report the small-scale spatial variation in cool ( T ∼ 10 4 K) Mg ii absorption detected in the circumgalactic medium (CGM) of a star-forming galaxy at z ≈ 0.8. The CGM of this galaxy is probed by a spatially extended bright background …
View article: Investigating chemical variations between interstellar gas clouds in the solar neighbourhood
Investigating chemical variations between interstellar gas clouds in the solar neighbourhood Open
The interstellar medium (ISM) is a fundamental component of the Milky Way. Studying its chemical composition and the level of its chemical diversity gives us insight into the evolution of the Milky Way and the role of gas in the Galactic e…
View article: Spatially Resolved Circumgalactic Medium around a Star-Forming Galaxy Driving a Galactic Outflow at $z\approx 0.8$
Spatially Resolved Circumgalactic Medium around a Star-Forming Galaxy Driving a Galactic Outflow at $z\approx 0.8$ Open
We report the small-scale spatial variation in cool ($T\sim 10^4 K$) Mg II absorption detected in the circumgalactic medium (CGM) of a star-forming galaxy at $z\approx 0.8$. The CGM of this galaxy is probed by a spatially extended bright b…
View article: Investigating chemical variations between interstellar gas clouds in the Solar neighbourhood
Investigating chemical variations between interstellar gas clouds in the Solar neighbourhood Open
The interstellar medium (ISM) is a fundamental component of the Milky Way. Studying its chemical composition and the level of its chemical diversity gives us insight into the evolution of the Milky Way and the role of gas in the Galactic e…
View article: Mapping the spatial extent of H I-rich absorbers using Mg II absorption along gravitational arcs
Mapping the spatial extent of H I-rich absorbers using Mg II absorption along gravitational arcs Open
H I -rich absorbers seen within quasar spectra contain the bulk of neutral gas in the Universe. However, the spatial extent of these reservoirs are not extensively studied due to the pencil beam nature of quasar sightlines. Using two giant…
View article: Mapping the spatial extent of HI-rich absorbers using MgII absorption along gravitational arcs
Mapping the spatial extent of HI-rich absorbers using MgII absorption along gravitational arcs Open
HI-rich absorbers seen within quasar spectra contain the bulk of neutral gas in the Universe. However, the spatial extent of these reservoirs are not extensively studied due to the pencil beam nature of quasar sightlines. Using two giant g…
View article: Molecular gas budget of strongly magnified low-mass star-forming galaxies at cosmic noon
Molecular gas budget of strongly magnified low-mass star-forming galaxies at cosmic noon Open
Aims. The aim of this study is to investigate the molecular gas content of strongly magnified low-mass star-forming galaxies (SFGs) around the cosmic noon period ( z ∼ 2) through observations of carbon monoxide (CO) emission lines and dust…
View article: Transverse clues on the kiloparsec-scale structure of the circumgalactic medium as traced by C IV absorption
Transverse clues on the kiloparsec-scale structure of the circumgalactic medium as traced by C IV absorption Open
The kiloparsec-scale kinematics and density structure of the circumgalactic medium (CGM) is still poorly constrained observationally, which poses a problem for understanding the role of the baryon cycle in galaxy evolution. Here we present…
View article: Modelling of long gamma-ray burst host galaxies at cosmic noon from damped Lyman-α absorption statistics
Modelling of long gamma-ray burst host galaxies at cosmic noon from damped Lyman-α absorption statistics Open
We study the properties of long gamma-ray burst (GRB) host galaxies using a statistical modelling framework derived to model damped Lyman-$\alpha$ absorbers (DLAs) in quasar spectra at high redshift. The distribution of $N_{\rm H\, {\small…
View article: DUNE: Dust depletion UNified method across cosmic time and Environments
DUNE: Dust depletion UNified method across cosmic time and Environments Open
We present a novel method to characterize dust depletion, namely, the depletion of metals into dust grains. We used observed correlations among relative abundances combining a total of 17 metals in diverse galactic environments, including …
View article: DUNE: Dust depletion UNified method across cosmic time and Environments
DUNE: Dust depletion UNified method across cosmic time and Environments Open
We present a novel method to characterize dust depletion, namely, the depletion of metals into dust grains. We used observed correlations among relative abundances combining a total of 17 metals in diverse galactic environments, including …
View article: Transverse clues on the kpc-scale structure of the circumgalactic medium as traced by C IV absorption
Transverse clues on the kpc-scale structure of the circumgalactic medium as traced by C IV absorption Open
We present VLT/MUSE integral-field spectroscopy ($R\approx 1\,800$) of four giant gravitational arcs exhibiting strong C IV absorption at 8 intervening redshifts, $z_{abs}\approx 2.0$--$2.5$. We detect C IV absorption in a total of 222 adj…
View article: Molecular gas budget of strongly magnified low-mass star-forming galaxies at cosmic noon
Molecular gas budget of strongly magnified low-mass star-forming galaxies at cosmic noon Open
This study aims to investigate the molecular gas content of strongly magnified low-mass star-forming galaxies around the cosmic noon period ($z\sim2$) through observations of CO emission lines and dust continuum emission, both of which ser…
View article: Astrometric detection of a Neptune-mass candidate planet in the nearest M-dwarf binary system GJ65 with VLTI/GRAVITY
Astrometric detection of a Neptune-mass candidate planet in the nearest M-dwarf binary system GJ65 with VLTI/GRAVITY Open
The detection of low-mass planets orbiting the nearest stars is a central stake of exoplanetary science, as they can be directly characterized much more easily than their distant counterparts. Here, we present the results of our long-term …
View article: Astrometric detection of a Neptune-mass candidate planet in the nearest M-dwarf binary system GJ65 with VLTI/GRAVITY
Astrometric detection of a Neptune-mass candidate planet in the nearest M-dwarf binary system GJ65 with VLTI/GRAVITY Open
The detection of low-mass planets orbiting the nearest stars is a central stake of exoplanetary science, as they can be directly characterized much more easily than their distant counterparts. Here, we present the results of our long-term …
View article: The <i>α</i>-element enrichment of gas in distant galaxies
The <i>α</i>-element enrichment of gas in distant galaxies Open
Context . The chemical evolution of distant galaxies cannot be assessed from observations of individual stars, in contrast to the case of nearby galaxies. On the other hand, the study of the interstellar medium (ISM) offers an alternative …
View article: The α-element enrichment of gas in distant galaxies
The α-element enrichment of gas in distant galaxies Open
The chemical evolution of distant galaxies cannot be assessed from observations of individual stars, in contrast to the case of nearby galaxies. On the other hand, the study of the interstellar medium (ISM) offers an alternative way to rev…
View article: <i>α</i>-element enhancements in the ISM of the LMC and SMC: Evidence of recent star formation
<i>α</i>-element enhancements in the ISM of the LMC and SMC: Evidence of recent star formation Open
Context . Important questions regarding the chemical composition of the neutral interstellar medium (ISM) in the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC) are still open. It is usually assumed that their metallicity is …
View article: A new precise determination of the primordial abundance of deuterium: measurement in the metal-poor sub-DLA system at <i>z</i> = 3.42 towards quasar J 1332+0052
A new precise determination of the primordial abundance of deuterium: measurement in the metal-poor sub-DLA system at <i>z</i> = 3.42 towards quasar J 1332+0052 Open
The theory of Big Bang nucleosynthesis, coupled with an estimate of the primordial deuterium abundance (D/H)pr, offers insights into the baryon density of the Universe. Independently, the baryon density can be constrained during a differen…
View article: α-element enhancements in the Magellanic Interstellar Medium: evidence for recent star formation
α-element enhancements in the Magellanic Interstellar Medium: evidence for recent star formation Open
Important questions on the chemical composition of the neutral ISM in the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC) are still open. It is usually assumed that their metallicity is uniform and equal to that measured in h…
View article: Dust depletion of metals from local to distant galaxies
Dust depletion of metals from local to distant galaxies Open
The evolution of cosmic dust content and the cycle between metals and dust in the interstellar medium (ISM) play a fundamental role in galaxy evolution. The chemical enrichment of the Universe can be traced through the evolution of the dus…
View article: Directly constraining the spatial coherence of the<i>z</i>∼ 1 circumgalactic medium
Directly constraining the spatial coherence of the<i>z</i>∼ 1 circumgalactic medium Open
One of the biggest puzzles regarding the circumgalactic medium (CGM) is the structure of its cool ( T ∼ 10 4 K) gas phase. While the kinematics of quasar absorption systems suggests the CGM is composed of a population of different clouds, …
View article: Directly constraining the spatial coherence of the $z\sim1$ circumgalactic medium
Directly constraining the spatial coherence of the $z\sim1$ circumgalactic medium Open
One of the biggest puzzles regarding the circumgalactic medium (CGM) is the structure of its cool ($T\sim10^4$ K) gas phase. While the kinematics of quasar absorption systems suggests the CGM is composed of a population of different clouds…
View article: Dust depletion of of metals from local to distant galaxies II: Cosmic dust-to-metal ratio and dust composition
Dust depletion of of metals from local to distant galaxies II: Cosmic dust-to-metal ratio and dust composition Open
The evolution of the cosmic dust content and the cycle between metals and dust in the interstellar medium (ISM) play a fundamental role in galaxy evolution. The chemical enrichment of the Universe can be traced through the evolution of the…
View article: Dissecting a 30 kpc galactic outflow at <i>z</i> ~ 1.7
Dissecting a 30 kpc galactic outflow at <i>z</i> ~ 1.7 Open
We present the spatially resolved measurements of a cool galactic outflow in the gravitationally lensed galaxy RCS0327 at z ≈ 1.703 using VLT/MUSE IFU observations. We probe the cool outflowing gas, traced by blueshifted Mg ii and Fe ii ab…
View article: The galaxy counterpart and environment of the dusty damped Lyman-<i>α</i>absorber at<i>z</i>= 2.226 towards Q 1218+0832
The galaxy counterpart and environment of the dusty damped Lyman-<i>α</i>absorber at<i>z</i>= 2.226 towards Q 1218+0832 Open
We report on further observations of the field of the quasar Q 1218+0832. Geier et al. (2019, A&A, 625, L9) presented the discovery of the quasar resulting from a search for quasars reddened and dimmed by dust in foreground damped Lyman- α…
View article: The galaxy counterpart and environment of the dusty Damped Lyman-alpha Absorber at z=2.226 towards Q1218+0832
The galaxy counterpart and environment of the dusty Damped Lyman-alpha Absorber at z=2.226 towards Q1218+0832 Open
We report on further observations of the field of the quasar Q1218+0832. Geier et al. 2019 presented the discovery of the quasar resulting from a search for quasars reddened and dimmed by dust in foreground damped Lyman-alpha absorbers (DL…
View article: Low-ionization iron-rich broad absorption-line quasar SDSS J 1652+2650: physical conditions in the ejected gas from excited Fe <scp>ii</scp> and metastable He <scp>i</scp>
Low-ionization iron-rich broad absorption-line quasar SDSS J 1652+2650: physical conditions in the ejected gas from excited Fe <span>ii</span> and metastable He <span>i</span> Open
We present high-resolution VLT/UVES spectroscopy and a detailed analysis of the unique broad absorption-line system towards the quasar SDSS J 165252.67+265001.96. This system exhibits low-ionization metal absorption lines from the ground s…
View article: Low-ionization iron-rich Broad Absorption-Line Quasar SDSS J1652+2650: Physical conditions in the ejected gas from excited FeII and metastable HeI
Low-ionization iron-rich Broad Absorption-Line Quasar SDSS J1652+2650: Physical conditions in the ejected gas from excited FeII and metastable HeI Open
We present high-resolution VLT/UVES spectroscopy and a detailed analysis of the unique Broad Absorption-Line system towards the quasar SDSS J165252.67+265001.96. This system exhibits low-ionization metal absorption lines from the ground st…