Search Publications
COSMOS-Web: Intrinsically Luminous z ≳ 10 Galaxy Candidates Test Early Stellar Mass Assembly
Finkelstein, Steven L.; Casey, Caitlin M.; Kartaltepe, Jeyhan S. +39 more
We report the discovery of 15 exceptionally luminous 10 ≲ z ≲ 14 candidate galaxies discovered in the first 0.28 deg2 of JWST/NIRCam imaging from the COSMOS-Web survey. These sources span rest-frame UV magnitudes of ‑20.5 > M UV > ‑22, and thus constitute the most intrinsically luminous z ≳ 10 candidates identified by J…
JWST Measurements of Neutral Hydrogen Fractions and Ionized Bubble Sizes at z = 7–12 Obtained with Lyα Damping Wing Absorptions in 27 Bright Continuum Galaxies
Ono, Yoshiaki; Ouchi, Masami; Harikane, Yuichi +5 more
We present volume-averaged neutral hydrogen fractions x H I and ionized bubble radii R b measured with Lyα damping wing absorption of galaxies at the epoch of reionization. We combine JWST/NIRSpec spectra taken by the CEERS, GO-1433, DDT-2750, and JADES programs and obtain a sample containing 27 bright UV-continuum (M UV…
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic Star Formation Rate Density 300 Myr after the Big Bang
Pérez-González, Pablo G.; Chevallard, Jacopo; Maseda, Michael V. +33 more
We characterize the earliest galaxy population in the JADES Origins Field, the deepest imaging field observed with JWST. We make use of ancillary Hubble Space Telescope optical images (five filters spanning 0.4–0.9 µm) and novel JWST images with 14 filters spanning 0.8‑5 µm, including seven medium-band filters, and reaching total expos…
ULTRASAT: A Wide-field Time-domain UV Space Telescope
Mazeh, T.; Gal-Yam, A.; Tal-Or, L. +41 more
The Ultraviolet Transient Astronomy Satellite (ULTRASAT) is scheduled to be launched to geostationary orbit in 2027. It will carry a telescope with an unprecedentedly large field of view (204 deg2) and near-ultraviolet (NUV; 230–290 nm) sensitivity (22.5 mag, 5σ, at 900 s). ULTRASAT will conduct the first wide-field survey of transient …
GN-z11 in Context: Possible Signatures of Globular Cluster Precursors at Redshift 10
Charlot, Stéphane; James, Bethan L.; Mingozzi, Matilde +5 more
The first JWST spectroscopy of the luminous galaxy GN-z11 simultaneously established its redshift at z = 10.6 and revealed a rest-ultraviolet spectrum dominated by signatures of highly ionized nitrogen, which has so far defied clear interpretation. We present a reappraisal of this spectrum in the context of both detailed nebular modeling and nearb…
First Detection of an Overmassive Black Hole Galaxy UHZ1: Evidence for Heavy Black Hole Seed Formation from Direct Collapse
Goulding, Andy D.; Natarajan, Priyamvada; Bogdán, Ákos +3 more
The recent Chandra-JWST discovery of a quasar in the z ≈ 10.1 galaxy UHZ1 reveals that accreting supermassive black holes were already in place 470 million years after the Big Bang. The Chandra X-ray source detected in UHZ1 is a Compton-thick quasar with a bolometric luminosity of L bol ~ 5 × 1045 erg s-1, which co…
Enhanced Subkiloparsec-scale Star Formation: Results from a JWST Size Analysis of 341 Galaxies at 5 < z < 14
Stiavelli, Massimo; Treu, Tommaso; Trenti, Michele +7 more
We present a comprehensive search and analysis of high-redshift galaxies in a suite of nine public JWST extragalactic fields taken in Cycle 1, covering a total effective search area of $\sim 358\,{\mathrm{arcmin}}^{2}$ . Through conservative (8σ) photometric selection, we identify 341 galaxies at 5 < z < 14, with 109 having spectroscopic red…
EIGER. V. Characterizing the Host Galaxies of Luminous Quasars at z ≳ 6
Simcoe, Robert A.; Naidu, Rohan P.; Kashino, Daichi +6 more
We report JWST/NIRCam measurements of quasar host galaxy emissions and supermassive black hole (SMBH) masses for six quasars at 5.9 < z < 7.1 in the Emission-line galaxies and Intergalactic Gas in the Epoch of Reionization (EIGER) project. We obtain deep NIRCam imaging in the F115W, F200W, and F356W bands, as well as F356W grism spectroscopy…
Between the Extremes: A JWST Spectroscopic Benchmark for High-redshift Galaxies Using ∼500 Confirmed Sources at z ≥ 5
Castellano, Marco; Fontana, Adriano; Pentericci, Laura +6 more
The exceptional spectra of the most luminous z > 10 sources observed so far have challenged our understanding of early galaxy evolution, requiring a new observational benchmark for meaningful interpretation. As such, we construct spectroscopic templates representative of high-redshift, star-forming populations, using 482 confirmed sources at z …
The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data
Chakrabarty, Deepto; Bogdanov, Slavko; Salmi, Tuomo +14 more
We report an updated analysis of the radius, mass, and heated surface regions of the massive pulsar PSR J0740+6620 using Neutron Star Interior Composition Explorer (NICER) data from 2018 September 21 to 2022 April 21, a substantial increase in data set size compared to previous analyses. Using a tight mass prior from radio-timing measurements and …