Nicolas Laporte
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View article: JWST and ALMA Joint Analysis with [O <scp>II</scp> ] <i>λλ</i> 3726, 3729, [O <scp>III</scp> ] <i>λ</i> 4363, [O <scp>III</scp> ] 88 <i>μ</i> m, and [O <scp>III</scp> ] 52 <i>μ</i> m: Multizone Evolution of Electron Densities at <i>z</i> ∼ 0–14 and its Impact on Metallicity Measurements
JWST and ALMA Joint Analysis with [O <span>II</span> ] <i>λλ</i> 3726, 3729, [O <span>III</span> ] <i>λ</i> 4363, [O <span>III</span> ] 88 <i>μ</i> m, and [O <span>III</span> ] 52 <i>μ</i> m: Multizone Evolution of Electron Densities at <i>z</i> ∼ 0–14 and its Impact on Metallicity Measurements Open
We present a JWST and Atacama Large Millimeter/submillimeter Array (ALMA) detailed study of the interstellar medium properties of high-redshift galaxies. Our JWST/NIRSpec integral field unit spectroscopy targeting three galaxies at z = 6–7…
View article: Glimmers in the Cosmic Dawn. II. A Variability Census of Supermassive Black Holes across the Universe<sup>*</sup>
Glimmers in the Cosmic Dawn. II. A Variability Census of Supermassive Black Holes across the Universe<sup>*</sup> Open
Understanding the origin and evolution of supermassive black holes (SMBHs) stands as one of the most important challenges in astrophysics and cosmology, with little current theoretical consensus. Improved observational constraints on the c…
View article: A direct black hole mass measurement in a Little Red Dot at the Epoch of Reionization
A direct black hole mass measurement in a Little Red Dot at the Epoch of Reionization Open
Recent discoveries of faint active galactic nuclei (AGN) at the redshift frontier have revealed a plethora of broad \Halpha emitters with optically red continua, named Little Red Dots (LRDs), which comprise 15-30\% of the high redshift bro…
View article: Exploring Spatially-Resolved Metallicities, Dynamics and Outflows in Low-Mass Galaxies at $z \sim 7.6$
Exploring Spatially-Resolved Metallicities, Dynamics and Outflows in Low-Mass Galaxies at $z \sim 7.6$ Open
A majority of JWST/NIRSpec/IFU studies at high redshifts to date have focused on UV-bright or massive objects, while our understanding of low-mass galaxies at early cosmic times remains limited. In this work, we present NIRSpec/IFS high-re…
View article: Before its time: a remarkably evolved protocluster core at z=7.88
Before its time: a remarkably evolved protocluster core at z=7.88 Open
Protoclusters represent the most extreme environments in the very early Universe. They form from large-scale dark matter overdensities, harbouring an overabundance of galaxies fed by large gas reservoirs. Their early and accelerated evolut…
View article: A black hole in a near-pristine galaxy 700 million years after the Big Bang
A black hole in a near-pristine galaxy 700 million years after the Big Bang Open
The recent discovery of a large number of massive black holes within the first two billion years after the Big Bang, as well as their peculiar properties, have been largely unexpected based on the extrapolation of the properties of luminou…
View article: JWST & ALMA Joint Analysis with [OII]$λλ$3726,3729, [OIII]$λ$4363, [OIII]88$μ$m, and [OIII]52$μ$m: Multi-Zone Evolution of Electron Densities at $\mathbf{z\sim0-14}$ and Its Impact on Metallicity Measurements
JWST & ALMA Joint Analysis with [OII]$λλ$3726,3729, [OIII]$λ$4363, [OIII]88$μ$m, and [OIII]52$μ$m: Multi-Zone Evolution of Electron Densities at $\mathbf{z\sim0-14}$ and Its Impact on Metallicity Measurements Open
We present a JWST and ALMA detailed study of the ISM properties of high-redshift galaxies. Our JWST/NIRSpec IFU spectroscopy targeting three galaxies at $z=6-7$ detects key rest-frame optical emission lines, allowing us to derive [OII]$λλ$…
View article: JWST, ALMA, and Keck Spectroscopic Constraints on the UV Luminosity Functions at <i>z</i> ∼ 7–14: Clumpiness and Compactness of the Brightest Galaxies in the Early Universe
JWST, ALMA, and Keck Spectroscopic Constraints on the UV Luminosity Functions at <i>z</i> ∼ 7–14: Clumpiness and Compactness of the Brightest Galaxies in the Early Universe Open
We present the number densities and physical properties of the bright galaxies spectroscopically confirmed at z ∼ 7–14. Our sample is composed of 60 galaxies at z spec ∼ 7–14, including recently confirmed galaxies at z spec = 12.34–14.18 w…
View article: Primordial Rotating Disk Composed of ≥15 Star Forming Clumps at Cosmic Dawn
Primordial Rotating Disk Composed of ≥15 Star Forming Clumps at Cosmic Dawn Open
Early galaxy formation, initiated by the dark matter and gas assembly, evolves through frequent mergers and feedback processes into dynamically hot, chaotic structures1. In contrast, dynamically cold, smooth rotating disks have been observ…
View article: Glimmers in the Cosmic Dawn. II. A variability census of supermassive black holes across the Universe
Glimmers in the Cosmic Dawn. II. A variability census of supermassive black holes across the Universe Open
Understanding the origin and evolution of supermassive black holes (SMBH) stands as one of the most important challenges in astrophysics and cosmology, with little current theoretical consensus. Improved observational constraints on the co…
View article: Rising from the ashes: evidence of old stellar populations and rejuvenation events in the very early Universe
Rising from the ashes: evidence of old stellar populations and rejuvenation events in the very early Universe Open
While JWST has observed galaxies assembling as early as $z\sim 14$, evidence of galaxies with significant old stellar populations in the Epoch of Reionization (EoR) – the descendants of these earliest galaxies – are few and far between. Bu…
View article: ALMA Lensing Cluster Survey: Dust mass measurements as a function of redshift, stellar mass, and star formation rate from <i>z</i> = 1 to <i>z</i> = 5
ALMA Lensing Cluster Survey: Dust mass measurements as a function of redshift, stellar mass, and star formation rate from <i>z</i> = 1 to <i>z</i> = 5 Open
Context. Understanding the dust content of galaxies, its evolution with redshift and its relation to stars and star formation is fundamental for our understanding of galaxy evolution. Dust acts as a catalyst of star formation and as a shie…
View article: ALMA Lensing Cluster Survey: Dust mass measurements as a function of redshift, stellar-mass and star formation rate, from z=1 to z=5
ALMA Lensing Cluster Survey: Dust mass measurements as a function of redshift, stellar-mass and star formation rate, from z=1 to z=5 Open
Understanding the dust content of galaxies, its evolution with redshift and its relationship to stars and star formation is fundamental for our understanding of galaxy evolution. Using the ALMA Lensing Cluster Survey (ALCS) wide-area band-…
View article: A complex node of the cosmic web associated with the massive galaxy cluster MACS J0600.1-2008
A complex node of the cosmic web associated with the massive galaxy cluster MACS J0600.1-2008 Open
MACS J0600.1-2008 (MACS0600) is an X-ray-luminous, massive galaxy cluster at $z_{\mathrm{d}}=0.43$, studied previously by the REionization LensIng Cluster Survey and ALMA Lensing Cluster Survey projects which revealed a complex, bimodal ma…
View article: Glimmers in the Cosmic Dawn: A Census of the Youngest Supermassive Black Holes by Photometric Variability*
Glimmers in the Cosmic Dawn: A Census of the Youngest Supermassive Black Holes by Photometric Variability* Open
We report the first results from a deep near-infrared campaign with the Hubble Space Telescope to obtain late-epoch images of the Hubble Ultra Deep Field, 10–15 yr after the first epoch data were obtained. The main objectives are to search…
View article: Charting the Lyman-alpha escape fraction in the range 2.9
Charting the Lyman-alpha escape fraction in the range 2.9 Open
The escape of Lyman-alpha photons at redshifts greater than two is an ongoing subject of study and an important quantity to further understanding of Lyman-alpha emitters (LAEs), the transmission of Lyman-alpha photons through the interstel…
View article: MOSAIC at the ELT: a unique instrument for the largest ground-based telescope
MOSAIC at the ELT: a unique instrument for the largest ground-based telescope Open
Pelló, Roser et al.-- Full list of authors: Pelló, Roser; Puech, Mathieu; Prieto, Éric; Rodrigues, Myriam; Sanchez-Janssen, Rubén.; Dalton, Gavin B.; Ducret, Franck; El Hadi, Kacem; García-Vargas, María. L.; Lynn, Jeff; Bharmal, Nazim A.; …
View article: Rising from the ashes: evidence of old stellar populations and rejuvenation events in the very early Universe
Rising from the ashes: evidence of old stellar populations and rejuvenation events in the very early Universe Open
While JWST has observed galaxies assembling as early as $z\sim14$, evidence of galaxies with significant old stellar populations in the Epoch of Reionisation (EoR) -- the descendants of these earliest galaxies -- are few and far between. B…
View article: JWST, ALMA, and Keck Spectroscopic Constraints on the UV Luminosity Functions at z~7-14: Clumpiness and Compactness of the Brightest Galaxies in the Early Universe
JWST, ALMA, and Keck Spectroscopic Constraints on the UV Luminosity Functions at z~7-14: Clumpiness and Compactness of the Brightest Galaxies in the Early Universe Open
We present the number densities and physical properties of the bright galaxies spectroscopically confirmed at $z\sim7-14$. Our sample is composed of 60 galaxies at $z_\mathrm{spec}\sim7-14$, including recently-confirmed galaxies at $z_\mat…
View article: Nebular dominated galaxies: insights into the stellar initial mass function at high redshift
Nebular dominated galaxies: insights into the stellar initial mass function at high redshift Open
We identify a low-metallicity ($12+\log ({\rm O}/{\rm H})=7.59$) Ly $\alpha$-emitting galaxy at $z=5.943$ with evidence of a strong Balmer jump, arising from nebular continuum. While Balmer jumps are sometimes observed in low-redshift star…
View article: GA-NIFS: <i>JWST</i> discovers an offset AGN 740 million years after the big bang
GA-NIFS: <i>JWST</i> discovers an offset AGN 740 million years after the big bang Open
A surprising finding of recent studies is the large number of Active Galactic Nuclei (AGN) associated with moderately massive black holes ($\rm \log (M_\bullet /M_\odot)\sim 6-8$), in the first billion years after the big bang (z > 5). …
View article: GN-z11: The environment of an active galactic nucleus at<i>z</i> = 10.603
GN-z11: The environment of an active galactic nucleus at<i>z</i> = 10.603 Open
Recent observations with the James Webb Space Telescope (JWST) have further refined the spectroscopic redshift of GN-z11, one of the most distant galaxies identified with the Hubble Space Telescope, at z = 10.603. The presence of extremely…
View article: A complex node of the cosmic web associated with the massive galaxy cluster MACS J0600.1-2008
A complex node of the cosmic web associated with the massive galaxy cluster MACS J0600.1-2008 Open
MACS J0600.1-2008 (MACS0600) is an X-ray luminous, massive galaxy cluster at $z_{\mathrm{d}}=0.43$, studied previously by the REionization LensIng Cluster Survey (RELICS) and ALMA Lensing Cluster Survey (ALCS) projects which revealed a com…
View article: JADES
JADES Open
Finding the first generation of stars formed out of pristine gas in the early Universe, known as Population III (PopIII) stars, is one of the most important goals of modern astrophysics. Recent models have suggested that PopIII stars may f…
View article: Glimmers in the Cosmic Dawn: A Census of the Youngest Supermassive Black Holes by Photometric Variability
Glimmers in the Cosmic Dawn: A Census of the Youngest Supermassive Black Holes by Photometric Variability Open
We report first results from a deep near infrared campaign with the Hubble Space Telescope to obtain late-epoch images of the Hubble Ultra-Deep Field (HUDF), 10-15 years after the first epoch data were obtained. The main objectives are to …
View article: Outshining in the spatially resolved analysis of a strongly lensed galaxy at <i>z</i> = 6.072 with JWST NIRCam
Outshining in the spatially resolved analysis of a strongly lensed galaxy at <i>z</i> = 6.072 with JWST NIRCam Open
We present JWST/NIRCam observations of a strongly lensed, sub- L * , multiply imaged galaxy at z = 6.072, with magnification factors μ ≳ 20 across the galaxy. The galaxy has rich HST, MUSE, and ALMA ancillary observations across a broad wa…
View article: Primordial Rotating Disk Composed of $\geq$15 Dense Star-Forming Clumps at Cosmic Dawn
Primordial Rotating Disk Composed of $\geq$15 Dense Star-Forming Clumps at Cosmic Dawn Open
Early galaxy formation, initiated by the dark matter and gas assembly, evolves through frequent mergers and feedback processes into dynamically hot, chaotic structures. In contrast, dynamically cold, smooth rotating disks have been observe…
View article: Galaxy main sequence and properties of low-mass Lyman-<i>α</i> emitters towards reionisation as viewed by VLT/MUSE and JWST/NIRCam
Galaxy main sequence and properties of low-mass Lyman-<i>α</i> emitters towards reionisation as viewed by VLT/MUSE and JWST/NIRCam Open
Context. Faint, star-forming galaxies are likely to play a dominant role in cosmic reionisation. Great strides have been made in recent years to characterise these populations at high redshifts ( z > 3). Now, for the first time, with JWST …