Search Publications
A first look at the SMACS0723 JWST ERO: spectroscopic redshifts, stellar masses, and star-formation histories
Cullen, F.; McLure, R. J.; Dunlop, J. S. +9 more
We present a first-look analysis of the JWST ERO data in the SMACS J0723.3-7327 cluster field. We begin by reporting 10 new spectroscopic redshifts from λobs = 1.8-5.2 µm NIRSpec medium-resolution (R = λ/Δλ = 1000) data. These are determined via multiple high-SNR emission line detections with five objects at 1 < z < 3 displa…
Parameters of 220 million stars from Gaia BP/RP spectra
Rix, Hans-Walter; Zhang, Xiangyu; Green, Gregory M.
We develop, validate and apply a forward model to estimate stellar atmospheric parameters (Teff, log g, and [Fe/H]), revised distances and extinctions for 220 million stars with XP spectra from Gaia DR3. Instead of using ab initio stellar models, we develop a data-driven model of Gaia XP spectra as a function of the stellar parameters, …
The ultraviolet continuum slopes (β) of galaxies at z ≃ 8-16 from JWST and ground-based near-infrared imaging
Bowler, R. A. A.; McLure, R. J.; Dunlop, J. S. +7 more
We study the rest-frame ultraviolet (UV) continuum slopes (β) of galaxies at redshifts 8 < z < 16 (⟨z⟩ = 10), using a combination of JWST ERO and ERS NIRCam imaging and ground-based near-infrared imaging of the COSMOS field. The combination of JWST and ground-based imaging provides a wide baseline in both redshift and absolute UV magnitude (…
JWST unveils heavily obscured (active and passive) sources up to z 13
Bisigello, Laura; Grazian, Andrea; Iani, Edoardo +5 more
A wealth of extragalactic populations completely missed at UV-optical wavelengths has been identified in the last decade, combining the deepest HST and Spitzer observations. These dark sources are thought to be dusty and star-forming systems at 3 < z < 5, and major contributors to the stellar mass build up. In this letter, we report an inves…
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…
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…
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…
S 5: Probing the Milky Way and Magellanic Clouds potentials with the 6D map of the Orphan-Chenab stream
Lewis, Geraint F.; Erkal, Denis; Bland-Hawthorn, Joss +12 more
We present a 6D map of the Orphan-Chenab (OC) stream by combining the data from Southern Stellar Stream Spectroscopic Survey (S5) and Gaia. We reconstruct the proper motion, radial velocity, distance, on-sky track, and stellar density along the stream with spline models. The stream has a total luminosity of MV = -8.2 and meta…
On the ages of bright galaxies 500 Myr after the big bang: insights into star formation activity at z ≳ 15 with JWST
Charlot, Stéphane; Chen, Zuyi; Stark, Daniel P. +3 more
With JWST, new opportunities to study the evolution of galaxies in the early Universe are emerging. Spitzer constraints on rest-optical properties of z ≳ 7 galaxies demonstrated the power of using galaxy stellar masses and star formation histories (SFHs) to indirectly infer the cosmic star formation history. However, only the brightest individual …