David Sobral
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View article: J-HERTz: J-PLUS Heritage Exploration of Radio Targets at <i>z</i> < 5
J-HERTz: J-PLUS Heritage Exploration of Radio Targets at <i>z</i> < 5 Open
We introduce J-HERTz (J-PLUS Heritage Exploration of Radio Targets at z < 5), a new multiwavelength catalog that combines optical narrowband photometry from J-PLUS, infrared observations from the Wide-field Infrared Survey Explorer, and de…
View article: The <i>JWST</i> Emission Line Survey (JELS): the sizes and merger fraction of star-forming galaxies during the Epoch of Reionization
The <i>JWST</i> Emission Line Survey (JELS): the sizes and merger fraction of star-forming galaxies during the Epoch of Reionization Open
We used observations from the JWST Emission Line Survey (JELS) to measure the half-light radii ($r_{e}$) of 23 H$\alpha$-emitting star-forming (SF) galaxies at $z=6.1$ in the PRIMER/COSMOS field. Galaxy sizes were measured in JWST near-inf…
View article: The JWST Emission Line Survey (JELS): The sizes and merger fraction of star-forming galaxies during the Epoch of Reionization
The JWST Emission Line Survey (JELS): The sizes and merger fraction of star-forming galaxies during the Epoch of Reionization Open
We used observations from the JWST Emission Line Survey (JELS) to measure the half-light radii ($r_{e}$) of 23 H$α$-emitting star-forming (SF) galaxies at $z=6.1$ in the PRIMER/COSMOS field. Galaxy sizes were measured in JWST Near-infrared…
View article: The <i>JWST</i> Emission-Line Survey: extending rest-optical narrow-band emission-line selection into the Epoch of Reionization
The <i>JWST</i> Emission-Line Survey: extending rest-optical narrow-band emission-line selection into the Epoch of Reionization Open
We present the JWST Emission-Line Survey (JELS), a JWST imaging programme exploiting the wavelength coverage and sensitivity of the Near-Infrared Camera (NIRCam) to extend narrow-band rest-optical emission-line selection into the Epoch of …
View article: The <i>JWST</i> Emission Line Survey (JELS): an untargeted search for H α emission line galaxies at <i>z</i> &gt; 6 and their physical properties
The <i>JWST</i> Emission Line Survey (JELS): an untargeted search for H α emission line galaxies at <i>z</i> > 6 and their physical properties Open
We present the first results of the JWST Emission Line Survey (JELS). Utilizing the first NIRCam narrow-band imaging at 4.7 $\mu$m, over 63 arcmin$^{2}$ in the PRIMER/COSMOS field, we have identified 609 emission line galaxy candidates. Fr…
View article: A "Black Hole Star" Reveals the Remarkable Gas-Enshrouded Hearts of the Little Red Dots
A "Black Hole Star" Reveals the Remarkable Gas-Enshrouded Hearts of the Little Red Dots Open
The physical processes that led to the formation of billion solar mass black holes within the first 700 million years of cosmic time remain a puzzle. Several theoretical scenarios have been proposed to seed and rapidly grow black holes, bu…
View article: J-PLUS: Spectroscopic validation of H<i>α</i> emission line maps in spatially resolved galaxies
J-PLUS: Spectroscopic validation of H<i>α</i> emission line maps in spatially resolved galaxies Open
Aims . We present a dedicated automated pipeline to construct spatially resolved emission H α +[NII] maps and to derive the spectral energy distributions (SEDs) in 12 optical filters (five broad and seven narrow and medium) of H α emission…
View article: J-PLUS: Spectroscopic validation of H$α$ emission line maps in spatially resolved galaxies
J-PLUS: Spectroscopic validation of H$α$ emission line maps in spatially resolved galaxies Open
We present a dedicated automated pipeline to construct spatially resolved emission H$α$+[NII] maps and to derive the spectral energy distributions (SEDs) in 12 optical filters (five broad and seven narrow/medium) of H$α$ emission line regi…
View article: An unambiguous AGN and a Balmer break in an Ultraluminous Little Red Dot at z=4.47 from Ultradeep UNCOVER and All the Little Things Spectroscopy
An unambiguous AGN and a Balmer break in an Ultraluminous Little Red Dot at z=4.47 from Ultradeep UNCOVER and All the Little Things Spectroscopy Open
We present a detailed exploration of the most optically-luminous Little Red Dot ($L_{Hα}=10^{44}$erg/s, $L_V=10^{45}$erg/s, F444W=22AB) found to date. Located in the Abell 2744 field, source A744-45924 was observed by NIRSpec/PRISM with ul…
View article: Evolution of H α equivalent widths from z ∼ 0.4 - 2.2: implications for star formation and legacy surveys with <i>Roman</i> and <i>Euclid</i>
Evolution of H α equivalent widths from z ∼ 0.4 - 2.2: implications for star formation and legacy surveys with <i>Roman</i> and <i>Euclid</i> Open
Past studies have investigated the evolution in specific star formation rate (sSFR) and its observational proxy (H $\alpha$ equivalent width; EW) up to $z \sim 6$; however, such measurements may overestimate the typical sSFR/EW at a given …
View article: The JWST Emission Line Survey (JELS): An untargeted search for H$α$ emission line galaxies at $z > 6$ and their physical properties
The JWST Emission Line Survey (JELS): An untargeted search for H$α$ emission line galaxies at $z > 6$ and their physical properties Open
We present the first results of the JWST Emission Line Survey (JELS). Utilising the first NIRCam narrow-band imaging at 4.7$μ$m, over 63 arcmin$^{2}$ in the PRIMER/COSMOS field, we identified 609 emission line galaxy candidates. From these…
View article: The JWST Emission Line Survey (JELS): Extending rest-optical narrow-band emission line selection into the Epoch of Reionization
The JWST Emission Line Survey (JELS): Extending rest-optical narrow-band emission line selection into the Epoch of Reionization Open
We present the JWST Emission Line Survey (JELS), a JWST imaging programme exploiting the wavelength coverage and sensitivity of NIRCam to extend narrow-band rest-optical emission line selection into the epoch of reionization (EoR) for the …
View article: All the Little Things in Abell 2744: $>$1000 Gravitationally Lensed Dwarf Galaxies at $z=0-9$ from JWST NIRCam Grism Spectroscopy
All the Little Things in Abell 2744: $>$1000 Gravitationally Lensed Dwarf Galaxies at $z=0-9$ from JWST NIRCam Grism Spectroscopy Open
Dwarf galaxies hold the key to crucial frontiers of astrophysics, however, their faintness renders spectroscopy challenging. Here we present the JWST Cycle 2 survey, All the Little Things (ALT, PID 3516), which is designed to seek late-for…
View article: Anatomy of an ionized bubble: NIRCam grism spectroscopy of the z = 6.6 double-peaked Lyman-α emitter COLA1 and its environment
Anatomy of an ionized bubble: NIRCam grism spectroscopy of the z = 6.6 double-peaked Lyman-α emitter COLA1 and its environment Open
The increasingly neutral intergalactic gas at $z>6$ impacts the Lyman-$α$ flux observed from galaxies. One luminous galaxy, COLA1, stands out because of its unique double-peaked Ly$α$ line at $z=6.6$, unseen in any simulation of reionizati…
View article: An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: an unbiased study of SMG environments measured with narrow-band imaging
An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: an unbiased study of SMG environments measured with narrow-band imaging Open
Submillimetre galaxies (SMGs) are some of the most extreme star-forming systems in the Universe, whose place in the framework of galaxy evolution is as yet uncertain. It has been hypothesized that SMGs are progenitors of local early-type g…
View article: An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: an unbiased study of SMG environments measured with narrowband imaging
An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: an unbiased study of SMG environments measured with narrowband imaging Open
Submillimetre galaxies (SMGs) are some of the most extreme star-forming systems in the Universe, whose place in the framework of galaxy evolution is as yet uncertain. It has been hypothesised that SMGs are progenitors of local early-type g…
View article: Evolution of H$α$ Equivalent Widths from $z \sim 0.4-2.2$: implications for star formation and legacy surveys with Roman and Euclid
Evolution of H$α$ Equivalent Widths from $z \sim 0.4-2.2$: implications for star formation and legacy surveys with Roman and Euclid Open
We investigate the `intrinsic' H$α$ EW distributions of $z \sim 0.4 - 2.2$ narrowband-selected H$α$ samples from HiZELS and DAWN using a forward modeling approach. We find an EW - stellar mass anti-correlation with steepening slopes $-0.18…
View article: Anatomy of an ionized bubble: NIRCam grism spectroscopy of the <i>z</i> = 6.6 double-peaked Lyman-<i>α</i> emitter COLA1 and its environment
Anatomy of an ionized bubble: NIRCam grism spectroscopy of the <i>z</i> = 6.6 double-peaked Lyman-<i>α</i> emitter COLA1 and its environment Open
The increasingly neutral intergalactic gas at z > 6 impacts the Lyman- α (Ly α ) flux observed from galaxies. One luminous galaxy, COLA1, stands out because of its unique double-peaked Ly α line at z = 6.6, unseen in any simulation of reio…
View article: The Large Early Galaxy Astrophysics Census (LEGA-C) Data Release 2: Dynamical and Stellar Population Properties of z ≲ 1 Galaxies in the COSMOS Field
The Large Early Galaxy Astrophysics Census (LEGA-C) Data Release 2: Dynamical and Stellar Population Properties of z ≲ 1 Galaxies in the COSMOS Field Open
We present the second data release of the Large Early Galaxy Astrophysics Census (LEGA-C), an ESO 130-night public spectroscopic survey conducted with VIMOS on the Very Large Telescope. We release 1988 spectra with typical continuum S/N si…
View article: The Velocity Dispersion Function for Massive Quiescent and Star-forming Galaxies at 0.6 < z ≤ 1.0
The Velocity Dispersion Function for Massive Quiescent and Star-forming Galaxies at 0.6 < z ≤ 1.0 Open
We present the first direct spectroscopic measurement of the stellar velocity dispersion function (VDF) for massive quiescent and star-forming galaxies at 0.6 < z ≤ 1.0. For this analysis we use individual measurements of stellar velocity …
View article: The Velocity Dispersion Function for Massive Quiescent and Star-Forming Galaxies at 0.6 $<$ z $\leq$ 1.0
The Velocity Dispersion Function for Massive Quiescent and Star-Forming Galaxies at 0.6 $<$ z $\leq$ 1.0 Open
We present the first direct spectroscopic measurement of the stellar velocity dispersion function (VDF) for massive quiescent and star-forming galaxies at $0.6 < z \leq 1.0$. For this analysis we use individual measurements of stellar velo…
View article: Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at <i>z</i> = 2.16
Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at <i>z</i> = 2.16 Open
We use multi-object near-infrared spectroscopy with VLT/KMOS to investigate the role of the environment in the evolution of the ionized gas properties of narrow-band-selected H α emitters (HAEs) in the Spiderweb protocluster at z = 2.16. B…
View article: Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at z=2.16
Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at z=2.16 Open
We use multi-object near-infrared (NIR) spectroscopy with VLT/KMOS to investigate the role of the environment in the evolution of the ionized gas properties of narrow-band selected H$α$ emitters (HAEs) in the Spiderweb protocluster at $z=2…
View article: J-PLUS: Uncovering a large population of extreme [OIII] emitters in the local Universe
J-PLUS: Uncovering a large population of extreme [OIII] emitters in the local Universe Open
Context. Over the past decades, several studies have discovered a population of galaxies that undergo very strong star formation events. They are called extreme emission line galaxies (EELGs). Aims. We exploit the capabilities of the Javal…
View article: The miniJPAS survey: A search for extreme emission-line galaxies
The miniJPAS survey: A search for extreme emission-line galaxies Open
Context. Galaxies with extreme emission lines (EELGs) may play a key role in the evolution of the Universe, as well as in our understanding of the star formation process itself. For this reason an accurate determination of their spatial de…
View article: The miniJPAS survey: Identification and characterization of the emission line galaxies down to<i>z</i>< 0.35 in the AEGIS field
The miniJPAS survey: Identification and characterization of the emission line galaxies down to<i>z</i>< 0.35 in the AEGIS field Open
The Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS) is expected to map thousands of square degrees of the northern sky with 56 narrowband filters (spectral resolution of R ∼ 60) in the upcoming years. This reso…
View article: LEGA-C: Analysis of Dynamical Masses from Ionized Gas and Stellar Kinematics at z ∼ 0.8
LEGA-C: Analysis of Dynamical Masses from Ionized Gas and Stellar Kinematics at z ∼ 0.8 Open
We compare dynamical mass estimates based on spatially extended stellar and ionized gas kinematics ( M dyn,* and M dyn,eml , respectively) of 157 star-forming galaxies at 0.6 ≤ z < 1. Compared with z ∼ 0, these galaxies have enhanced star …
View article: The LEGA-C and SAMI galaxy surveys: quiescent stellar populations and the mass–size plane across 6 Gyr
The LEGA-C and SAMI galaxy surveys: quiescent stellar populations and the mass–size plane across 6 Gyr Open
We investigate changes in stellar population age and metallicity ([Z/H]) scaling relations for quiescent galaxies from intermediate redshift (0.60 ≤ $z$ ≤ 0.76) using the LEGA-C Survey to low redshift (0.014 ≤ $z$ ≤ 0.10) using the SAMI Ga…
View article: (Re)Solving reionization with Lyα: how bright Lyα Emitters account for the <i>z</i> ≈ 2–8 cosmic ionizing background
(Re)Solving reionization with Lyα: how bright Lyα Emitters account for the <i>z</i> ≈ 2–8 cosmic ionizing background Open
The cosmic ionizing emissivity from star-forming galaxies has long been anchored to UV luminosity functions. Here, we introduce an emissivity framework based on Lyα emitters (LAEs), which naturally hones in on the subset of galaxies respon…
View article: Black hole virial masses from single-epoch photometry
Black hole virial masses from single-epoch photometry Open
Context. Precise measurements of black hole masses are essential to understanding the coevolution of these sources and their host galaxies. Aims. We develop a novel approach for computing black hole virial masses using measurements of cont…