Search Publications
Star formation at the smallest scales: a JWST study of the clump populations in SMACS0723
Mahler, Guillaume; Richard, Johan; Adamo, Angela +3 more
We present the clump populations detected in 18 lensed galaxies at redshifts 1--8.5 within the lensing cluster field SMACS0723. The recent JWST Early Release Observations of this poorly known region of the sky have revealed numerous point-like sources within and surrounding their host galaxies, undetected in the shallower Hubble Space Telescope im…
galstreams: A library of Milky Way stellar stream footprints and tracks
Mateu, Cecilia
Nearly a hundred stellar streams have been found to date around the Milky Way and the number keeps growing at an ever faster pace. Here we present the galstreams library, a compendium of angular position, distance, proper motion, and radial velocity track data for nearly a hundred (95) Galactic stellar streams. The information published in the lit…
First Sample of Hα+[O III]λ5007 Line Emitters at z > 6 Through JWST/NIRCam Slitless Spectroscopy: Physical Properties and Line-luminosity Functions
Koekemoer, Anton M.; Pirzkal, Nor; Gennaro, Mario +26 more
We present a sample of four emission-line galaxies at z = 6.11-6.35 that were serendipitously discovered using the commissioning data for the James Webb Space Telescope (JWST)/NIRCam wide-field slitless spectroscopy mode. One of them (at z = 6.11) has been reported previously, while the others are new discoveries. These sources are selected by the…
UNCOVERing the extended strong lensing structures of Abell 2744 with the deepest JWST imaging
Franx, Marijn; Labbé, Ivo; van Dokkum, Pieter +18 more
We present a new parametric lens model for the massive galaxy cluster Abell 2744 based on new ultra-deep JWST imaging taken in the framework of the UNCOVER program. These observations constitute the deepest JWST images of a lensing cluster to date, adding to existing deep Hubble Space Telescope (HST) images and the recent JWST Early Release Scienc…
Detection of stellar light from quasar host galaxies at redshifts above 6
Baba, Shunsuke; Treu, Tommaso; Fujimoto, Seiji +41 more
The detection of starlight from the host galaxies of quasars during the reionization epoch (z > 6) has been elusive, even with deep Hubble Space Telescope observations1,2. The current highest redshift quasar host detected3, at z = 4.5, required the magnifying effect of a foreground lensing galaxy. Low-luminosity quasars
A rich hydrocarbon chemistry and high C to O ratio in the inner disk around a very low-mass star
Waters, L. B. F. M.; Olofsson, G.; Abergel, A. +43 more
Carbon is an essential element for life but how much can be delivered to young planets is still an open question. The chemical characterization of planet-forming disks is a crucial step in our understanding of the diversity and habitability of exoplanets. Very low-mass stars (less than 0.2 M⊙) are interesting targets because they host a…
The nature of an ultra-faint galaxy in the cosmic dark ages seen with JWST
Santini, Paola; Castellano, Marco; Fontana, Adriano +44 more
In the first billion years after the Big Bang, sources of ultraviolet (UV) photons are believed to have ionized intergalactic hydrogen, rendering the Universe transparent to UV radiation. Galaxies brighter than the characteristic luminosity L* (refs. 1,2) do not provide enough ionizing photons to drive this cosmic reionization. Fainter …
High-z galaxies with JWST and local analogues - it is not only star formation
Brinchmann, Jarle
I present an analysis of the JWST NIRSpec data of SMACS 0723 released as Early Release Observations. As part of this three new redshifts are provided, bringing the total of reliable redshifts to 14. I propose a modification to the direct abundance determination method that reduces sensitivity to flux calibration uncertainties by a factor of ~3 and…
Morphologies of Galaxies at z ≳ 9 Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at z 12
Ono, Yoshiaki; Ouchi, Masami; Harikane, Yuichi +8 more
We present morphologies of galaxies at z ≳ 9 resolved by JWST/NIRCam 2-5 µm imaging. Our sample consists of 22 galaxy candidates identified by stringent dropout and photo-z criteria in GLASS, CEERS, SMACS J0723, and Stephan's Quintet flanking fields, one of which has been spectroscopically identified at z = 11.44. We perform surface brightne…
Gaia Data Release 3. All-sky classification of 12.4 million variable sources into 25 classes
Gavras, Panagiotis; Ábrahám, Péter; Gomel, Roy +31 more
Context. Gaia DR3 contains 1.8 billion sources with G-band photometry, 1.5 billion of which with GBP and GRP photometry, complemented by positions on the sky, parallax, and proper motion. The median number of field-of-view transits in the three photometric bands is between 40 and 44 measurements per source and covers 34 month…