Wilfried Mercier
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View article: Brightest group galaxies in COSMOS-Web: Evolution of the size-mass relation since z = 3.7
Brightest group galaxies in COSMOS-Web: Evolution of the size-mass relation since z = 3.7 Open
We present the first comprehensive study of the structural evolution of brightest group galaxies (BGGs) from redshift z ≃ 0.08 to z = 3.7 using the James Webb Space Telescope ’s 255-hour COSMOS-Web program. This survey provides deep NIRCam…
View article: On Soft Clustering For Correlation Estimators
On Soft Clustering For Correlation Estimators Open
Properly estimating correlations between objects at different spatial scales necessitates distance calculations. For this reason, most widely adopted packages for estimating correlations use clustering algorithms to approximate lo…
View article: Tracing the galaxy-halo connection with galaxy clustering in COSMOS-Web from <i>z</i> = 0.1 to <i>z</i> ∼ 12
Tracing the galaxy-halo connection with galaxy clustering in COSMOS-Web from <i>z</i> = 0.1 to <i>z</i> ∼ 12 Open
We explore the evolving relationship between galaxies and their dark matter halos from z ∼ 0.1 to z ∼ 12 using mass-limited angular clustering measurements in the 0.54 deg 2 of the COSMOS-Web survey, the largest contiguous JWST extragalact…
View article: The COSMOS-Web Lens Survey (COWLS) II: Depth, resolution, and NIR coverage from <i>JWST</i> reveals 17 spectacular lenses
The COSMOS-Web Lens Survey (COWLS) II: Depth, resolution, and NIR coverage from <i>JWST</i> reveals 17 spectacular lenses Open
The COSMOS-Web Lens Survey (COWLS) presents the first systematic search for strong gravitational lenses in the COSMOS-Web field using data from the James Webb Space Telescope (JWST). Using high-resolution NIRCam imaging, we visually inspec…
View article: The COSMOS-Web Lens Survey (COWLS) I: discovery of &gt;100 high redshift strong lenses in contiguous <i>JWST</i> imaging
The COSMOS-Web Lens Survey (COWLS) I: discovery of >100 high redshift strong lenses in contiguous <i>JWST</i> imaging Open
We present the COSMOS-Web Lens Survey (COWLS), a sample of over 100 strong lens candidates from the 0.54 deg$^2$ COSMOS-Web survey, discovered using exquisite James Webb Space Telescope (JWST) imaging across four wavebands. Following two r…
View article: Clumpiness of galaxies revealed in the near-infrared with COSMOS-Web
Clumpiness of galaxies revealed in the near-infrared with COSMOS-Web Open
Clumps in the rest-frame UV emission of galaxies have been observed for decades. Since the launch of the James Webb Space Telescope (JWST), a large population is detected in the rest-frame near-infrared (NIR), raising questions about their…
View article: The Cosmic Owl: Twin Active Collisional Ring Galaxies with Starburst Merging Front at $z=1.14$
The Cosmic Owl: Twin Active Collisional Ring Galaxies with Starburst Merging Front at $z=1.14$ Open
Galaxy mergers play a critical role in driving galaxy evolution, especially by transforming galaxy morphology, redistributing the gas around galaxies, triggering AGN activity and star formation. We present the Cosmic Owl, a galaxy merger a…
View article: COSMOS-Web: Estimating Physical Parameters of Galaxies Using Self-Organizing Maps
COSMOS-Web: Estimating Physical Parameters of Galaxies Using Self-Organizing Maps Open
The COSMOS-Web survey, with its unparalleled combination of multiband data, notably, near-infrared imaging from JWST's NIRCam (F115W, F150W, F277W, and F444W), provides a transformative dataset down to $\sim28$ mag (F444W) for studying gal…
View article: The COSMOS-Web ring: Spectroscopic confirmation of the background source at <i>z</i> = 5.1
The COSMOS-Web ring: Spectroscopic confirmation of the background source at <i>z</i> = 5.1 Open
We report the spectroscopic confirmation of the background source of the most distant Einstein ring known to date, the COSMOS-Web ring. This system consists of a complete Einstein ring at z = 5.1, which is lensed by a massive early-type ga…
View article: COSMOS-Web: A history of galaxy migrations over the stellar mass–star formation rate plane
COSMOS-Web: A history of galaxy migrations over the stellar mass–star formation rate plane Open
Context. The stellar mass-star formation rate ( M ⋆ − SFR) plane is an essential diagnostic to separate galaxy populations. However, we still lack a clear picture of how galaxies move within this plane along cosmic time. Aims. This study a…
View article: COSMOS-Web: Stellar mass assembly in relation to dark matter halos across 0.2 < <i>z</i> < 12 of cosmic history
COSMOS-Web: Stellar mass assembly in relation to dark matter halos across 0.2 < <i>z</i> < 12 of cosmic history Open
We study the stellar mass assembly of galaxies via the stellar mass function (SMF) and the coevolution with dark matter halos via abundance matching in the largest redshift range to date, 0.2 < z < 12. We used the 0.53 deg 2 imaged by JWST…
View article: Tracing the galaxy-halo connection with galaxy clustering in COSMOS-Web from z = 0.1 to z ~ 12
Tracing the galaxy-halo connection with galaxy clustering in COSMOS-Web from z = 0.1 to z ~ 12 Open
We explore the evolving relationship between galaxies and their dark matter halos from $z \sim 0.1$ to $z \sim 12$ using mass-limited angular clustering measurements in the 0.54 deg$^2$ of the COSMOS-Web survey. This study provides the fir…
View article: Near-IR clumps and their properties in high-<i>z</i> galaxies with <i>JWST</i>/NIRCam
Near-IR clumps and their properties in high-<i>z</i> galaxies with <i>JWST</i>/NIRCam Open
Resolved stellar morphology of $z\gt 1$ galaxies was inaccessible before JWST. This limitation, due to the impact of dust on rest-frame UV light, had withheld major observational conclusions required to understand the importance of clumps …
View article: Clumps as multiscale structures in cosmic noon galaxies
Clumps as multiscale structures in cosmic noon galaxies Open
Star-forming clumps have been found to significantly influence the star formation of gas-rich $z\gt 1$ galaxies. Using public data from JWST/NIRCam (Cosmic Evolution Survey; COSMOS-Web) and Atacama Large (sub-)Millimeter Array (ALMA; Fiber…
View article: COSMOS-Web: stellar mass assembly in relation to dark matter halos across $0.2
COSMOS-Web: stellar mass assembly in relation to dark matter halos across $0.2 Open
We study the stellar mass function (SMF) and the co-evolution with dark matter halos via abundance matching in the largest redshift range to date $0.25$, we find increased abundances of massive (log$\, M_{\star}/M_{\odot}>10.5$) implying i…
View article: COSMOS-Web: A history of galaxy migrations over the stellar mass-star formation rate plane
COSMOS-Web: A history of galaxy migrations over the stellar mass-star formation rate plane Open
The stellar mass-star formation rate ($\mathrm{M_*}$-$\mathrm{SFR}$) plane is a fundamental diagnostic for distinguishing galaxy populations. However, the evolutionary pathways of galaxies within this plane across cosmic time remain poorly…
View article: Stellar angular momentum of intermediate-redshift galaxies in MUSE surveys
Stellar angular momentum of intermediate-redshift galaxies in MUSE surveys Open
We quantify the stellar rotation of galaxies by computing the λ R parameter, a proxy for the stellar angular momentum in a sample of 106 intermediate-redshift galaxies (0.1 < z < 0.8). The sample is located in the CANDELS/GOODS-S and CANDE…
View article: Stellar angular momentum of intermediate redshift galaxies in MUSE surveys
Stellar angular momentum of intermediate redshift galaxies in MUSE surveys Open
We quantify the stellar rotation of galaxies by computing the $λ_{R}$ parameter, a proxy for the stellar angular momentum in a sample of 106 galaxies with redshift 0.1 $<$ z $<$ 0.8 and stellar masses from $\sim$10$^{7.5}$ to 10$^{11.8}$ M…
View article: Recovery of the low- and high-mass end slopes of the IMF in massive early-type galaxies using detailed elemental abundances
Recovery of the low- and high-mass end slopes of the IMF in massive early-type galaxies using detailed elemental abundances Open
Star formation in the early Universe has left its imprint on the chemistry of observable stars in galaxies. We derive elemental abundances and the slope of the low-mass end of the initial mass function (IMF) for a sample of 25 very massive…
View article: The COSMOS-Web ring: In-depth characterization of an Einstein ring lensing system at <i>z</i> ∼ 2
The COSMOS-Web ring: In-depth characterization of an Einstein ring lensing system at <i>z</i> ∼ 2 Open
Aims. We provide an in-depth analysis of the COSMOS-Web ring, an Einstein ring at z ≈ 2 that we serendipitously discovered during the data reduction of the COSMOS-Web survey and that could be the most distant lens discovered to date. Metho…
View article: Near-IR clumps and their properties in high-z galaxies with JWST/NIRCam
Near-IR clumps and their properties in high-z galaxies with JWST/NIRCam Open
Resolved stellar morphology of $z>1$ galaxies was inaccessible before JWST. This limitation, due to the impact of dust on rest-frame UV light, had withheld major observational conclusions required to understand the importance of clumps in …
View article: MAGIC: MUSE gAlaxy Groups In COSMOS – A survey to probe the impact of environment on galaxy evolution over the last 8 Gyr
MAGIC: MUSE gAlaxy Groups In COSMOS – A survey to probe the impact of environment on galaxy evolution over the last 8 Gyr Open
Context. Galaxies migrate along filaments of the cosmic web from small groups to clusters, which creates the appearance that the evolution of their properties speeds up as environments get denser. Aims. We introduce the M USE gAlaxy Groups…
View article: MusE GAs FLOw and Wind (MEGAFLOW) X. The cool gas and covering fraction of Mg <scp>ii</scp> in galaxy groups
MusE GAs FLOw and Wind (MEGAFLOW) X. The cool gas and covering fraction of Mg <span>ii</span> in galaxy groups Open
We present a study of the cool gas (≈104 K) traced by Mg ii absorptions around groups of galaxies in the MEGAFLOW (MusE GAs FLOw and Wind) survey. Using a combination of two algorithms, we blindly identify 32 groups of more than 5 galaxies…
View article: MusE GAs FLOw and Wind (MEGAFLOW) X. The cool gas and covering fraction of MgII in galaxy groups
MusE GAs FLOw and Wind (MEGAFLOW) X. The cool gas and covering fraction of MgII in galaxy groups Open
We present a study of the cool gas ($\approx 10^4$ K) traced by MgII absorptions around groups of galaxies in the MEGAFLOW survey. Using a combination of two algorithms we blindly identify 32 groups of more than 5 galaxies at $0.3 < z < 1.…
View article: MAGIC: Muse gAlaxy Groups In Cosmos -- A survey to probe the impact of environment on galaxy evolution over the last 8 Gyr
MAGIC: Muse gAlaxy Groups In Cosmos -- A survey to probe the impact of environment on galaxy evolution over the last 8 Gyr Open
We introduce the MUSE gAlaxy Groups in COSMOS (MAGIC) survey, which was built to study the impact of environment on galaxy evolution over the last 8 Gyr. It consists of 17 MUSE fields targeting 14 massive structures at intermediate redshif…
View article: The COSMOS-Web ring: in-depth characterization of an Einstein ring lensing system at z~2
The COSMOS-Web ring: in-depth characterization of an Einstein ring lensing system at z~2 Open
Aims. We provide an in-depth analysis of the COSMOS-Web ring, an Einstein ring at z=2 that we serendipitously discovered in the COSMOS-Web survey and possibly the most distant lens discovered to date. Methods. We extract the visible and NI…
View article: Stellar angular momentum of disk galaxies at <i>z</i> ≈ 0.7 in the MAGIC survey
Stellar angular momentum of disk galaxies at <i>z</i> ≈ 0.7 in the MAGIC survey Open
Aims. At intermediate redshift, galaxy groups and clusters are thought to impact galaxy properties such as their angular momentum. We investigate whether the environment has an impact on the galaxies’ stellar angular momentum and identify …
View article: Stellar angular momentum of disk galaxies at z = 0.7 in the MAGIC survey I. Impact of the environment
Stellar angular momentum of disk galaxies at z = 0.7 in the MAGIC survey I. Impact of the environment Open
Aims: At intermediate redshift, galaxy groups/clusters are thought to impact galaxies (e.g. their angular momentum). We investigate whether the environment has an impact on the galaxies' angular momentum and identify underlying driving phy…
View article: MusE GAs FLOw and Wind (MEGAFLOW) IX. The impact of gas flows on the relations between the mass, star formation rate, and metallicity of galaxies
MusE GAs FLOw and Wind (MEGAFLOW) IX. The impact of gas flows on the relations between the mass, star formation rate, and metallicity of galaxies Open
We study the link between gas flow events and key galaxy scaling relations: the relations between star formation rate (SFR) and stellar mass (the main sequence, MS); gas metallicity and stellar mass (the mass–metallicity relation, MZR); an…
View article: Scaling relations of<i>z</i>∼ 0.25–1.5 galaxies in various environments from the morpho-kinematics analysis of the MAGIC sample
Scaling relations of<i>z</i>∼ 0.25–1.5 galaxies in various environments from the morpho-kinematics analysis of the MAGIC sample Open
Context. The evolution of galaxies is influenced by many physical processes, which may vary depending on their environment. Aims. We combine Hubble Space Telescope (HST) and Multi-Unit Spectroscopic Explorer (MUSE) data of galaxies at 0.25…