Search Publications
Nebular dominated galaxies: insights into the stellar initial mass function at high redshift
Bunker, Andrew J.; Cameron, Alex J.; Saxena, Aayush +3 more
We identify a low-metallicity (
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…
A fast-rotator post-starburst galaxy quenched by supermassive black-hole feedback at z = 3
Pérez-González, Pablo G.; Chevallard, Jacopo; Parlanti, Eleonora +23 more
The most massive galaxies in the Universe stopped forming stars due to the time-integrated feedback from central supermassive black holes (SMBHs). However, the exact quenching mechanism is not yet understood, because local massive galaxies were quenched billions of years ago. Here we present JWST/NIRSpec integral-field spectroscopy observations of…
JADES: The production and escape of ionizing photons from faint Lyman-alpha emitters in the epoch of reionization
Chevallard, Jacopo; Carniani, Stefano; Arribas, Santiago +32 more
We present the properties of 17 faint Lyman-α emitting galaxies (LAEs) at z > 5.8 from the JWST Advanced Deep Extragalactic Survey (JADES) spectroscopic data in the Hubble Ultra Deep Field/GOODS-S. These LAEs span a redshift range z ≈ 5.8 − 8.0 and a UV magnitude range MUV ≈ −17 to −20.6, with the Lyα equivalent width (EW) in the ran…
Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry
Valtchanov, I.; Prusti, T.; Mazeh, T. +413 more
Context. Gravitational waves from black-hole (BH) merging events have revealed a population of extra-galactic BHs residing in short-period binaries with masses that are higher than expected based on most stellar evolution models - and also higher than known stellar-origin black holes in our Galaxy. It has been proposed that those high-mass BHs are…
A lanthanide-rich kilonova in the aftermath of a long gamma-ray burst
Kilpatrick, Charles D.; Lee, Chung-Uk; Im, Myungshin +24 more
Observationally, kilonovae are astrophysical transients powered by the radioactive decay of nuclei heavier than iron, thought to be synthesized in the merger of two compact objects1-4. Over the first few days, the kilonova evolution is dominated by a large number of radioactive isotopes contributing to the heating rate2,5. On…
Accelerated formation of ultra-massive galaxies in the first billion years
Dickinson, Mark; Illingworth, Garth D.; Labbé, Ivo +35 more
Recent James Webb Space Telescope (JWST) observations have revealed an unexpected abundance of massive-galaxy candidates in the early Universe, extending further in redshift and to lower luminosity than what had previously been found by submillimetre surveys1–6. These JWST candidates have been interpreted as challenging the Λ cold dark-…
A parsec-scale Galactic 3D dust map out to 1.25 kpc from the Sun
Speagle, Joshua S.; Zucker, Catherine; Finkbeiner, Douglas +4 more
Context. High-resolution 3D maps of interstellar dust are critical for probing the underlying physics shaping the structure of the interstellar medium, and for foreground correction of astrophysical observations affected by dust.
Aims: We aim to construct a new 3D map of the spatial distribution of interstellar dust extinction out to a distan…