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Radio and far-IR emission associated with a massive star-forming galaxy candidate at z ≃ 6.8: a radio-loud AGN in the reionization era?
Fan, Xiaohui; Stark, Daniel P.; Endsley, Ryan +7 more
We report the identification of radio (0.144-3 GHz) and mid-, far-infrared, and sub-mm (24-850µm) emission at the position of one of 41 UV-bright ($\mathrm{M_{\mathrm{UV}}}^{ }\lesssim -21.25$) z ≃ 6.6-6.9 Lyman-break galaxy candidates in the 1.5 deg2 COSMOS field. This source, COS-87259, exhibits a sharp flux discontinuity (facto…
The Cosmic Ultraviolet Baryon Survey (CUBS) V: on the thermodynamic properties of the cool circumgalactic medium at z ≲ 1
Faucher-Giguère, Claude-André; Johnson, Sean D.; Zahedy, Fakhri S. +11 more
This paper presents a systematic study of the photoionization and thermodynamic properties of the cool circumgalactic medium (CGM) as traced by rest-frame ultraviolet absorption lines around 26 galaxies at redshift z ≲ 1. The study utilizes both high-quality far-ultraviolet and optical spectra of background QSOs and deep galaxy redshift surveys to…
Galaxy luminosity function pipeline for cosmology and astrophysics
Muñoz, Julian B.; Sabti, Nashwan; Blas, Diego
Observations of high-redshift galaxies have provided us with a rich tool to study the physics at play during the epoch of reionization. The luminosity function (LF) of these objects is an indirect tracer of the complex processes that govern galaxy formation, including those of the first dark-matter structures. In this work, we present an extensive…
The ODYSSEUS Survey. Motivation and First Results: Accretion, Ejection, and Disk Irradiation of CVSO 109
Fang, Min; Edwards, Suzan; Banzatti, Andrea +59 more
The Hubble UV Legacy Library of Young Stars as Essential Standards (ULLYSES) Director's Discretionary Program of low-mass pre-main-sequence stars, coupled with forthcoming data from Atacama Large Millimeter/submillimeter Array and James Webb Space Telescope, will provide the foundation to revolutionize our understanding of the relationship between…
The incidence of X-ray selected AGN in nearby galaxies
Birchall, Keir L.; Watson, M. G.; Aird, J. +1 more
We present the identification and analysis of an unbiased sample of active galactic nuclei (AGN) that lie within the local galaxy population. Using the MPA-JHU catalogue (based on SDSS DR8) and 3XMM DR7 we define a parent sample of 25 949 local galaxies (z ≤ 0.33). After confirming that there was strictly no AGN light contaminating stellar mass an…
New constraints on anisotropic expansion from supernovae Type Ia
van Dyk, D. A.; Hudson, M. J.; Trotta, R. +2 more
We re-examine the contentious question of constraints on anisotropic expansion from Type Ia supernovae (SNIa) in the light of a novel determination of peculiar velocities, which are crucial to test isotropy with SNe out to distances ⪝200h-1 Mpc. We re-analyse the Joint Light-Curve Analysis (JLA) Supernovae (SNe) data, improving on previ…
Direct Constraints on the Extremely Metal-poor Massive Stars Underlying Nebular C IV Emission from Ultra-deep HST/COS Ultraviolet Spectroscopy
Charlot, Stéphane; Chevallard, Jacopo; Sanders, Ryan L. +8 more
Metal-poor nearby galaxies hosting massive stars have a fundamental role to play in our understanding of both high-redshift galaxies and low-metallicity stellar populations. But while much attention has been focused on their bright nebular gas emission, the massive stars that power it remain challenging to constrain. Here we present exceptionally …
The Structure of the Large-Scale Heliosphere as Seen by Current Models
Heerikhuisen, Jacob; Fraternale, Federico; Pogorelov, Nikolai +6 more
This review summarizes the current state of research aiming at a description of the global heliosphere using both analytical and numerical modeling efforts, particularly in view of the overall plasma/neutral flow and magnetic field structure, and its relation to energetic neutral atoms. Being part of a larger volume on current heliospheric researc…
The chemical signature of the Galactic spiral arms revealed by Gaia DR3
Schultheis, M.; Recio-Blanco, A.; de Laverny, P. +8 more
Taking advantage of the recent Gaia Data Release 3 (DR3), we mapped chemical inhomogeneities in the Milky Way's disc out to a distance of ∼4 kpc from the Sun, using different samples of bright giant stars. The samples were selected using effective temperatures and surface gravities from the GSP-Spec module, and they are expected to trace stellar p…
HST Strong-lensing Model for the First JWST Galaxy Cluster SMACS J0723.3-7327
Zitrin, Adi; Furtak, Lukas J.; Meena, Ashish K. +1 more
On 2022 July 8, NASA shared (https://www.nasa.gov/feature/goddard/2022/nasa-shares-list-of-cosmic-targets-for-webb-telescope-s-first-images) the list of five public showcase targets that have been observed with the new James Webb Space Telescope (JWST) and whose data-at the time of writing-are expected to be released to the public around Tuesday, …