Search Publications
The Pristine dwarf galaxy survey - IV. Probing the outskirts of the dwarf galaxy Boötes I
Sestito, Federico; McConnachie, Alan W.; Navarro, Julio F. +12 more
We present a new spectroscopic study of the dwarf galaxy Boötes I (Boo I) with data from the Anglo-Australian Telescope and its AAOmega spectrograph together with the Two Degree Field multi-object system. We observed 36 high-probability Boo I stars selected using Gaia Early Data Release 3 proper motions and photometric metallicities from the Prist…
Internal kinematics of Gaia eDR3 wide binaries
Hernandez, X.; Cortés, R. A. M.; Cookson, S.
Using the recent Gaia eDR3 catalogue, we construct a sample of solar neighbourhood isolated wide binaries satisfying a series of strict signal-to-noise data cuts, exclusion of random association criteria, and detailed colour-magnitude diagram selections to minimize the presence of any kinematic contaminating effects having been discussed in the li…
How much hydrogen is in Type Ib and IIb supernova progenitors?
Arcavi, Iair; Gilkis, Avishai
Core-collapse supernovae showing little or no hydrogen (denoted by Type IIb and Ib, respectively) are the explosions of massive stars that have lost some or most of their outer envelopes. How they lose their mass is unclear, but it likely involves binary interaction. So far, seven progenitors of such supernovae have been identified in pre-explosio…
Exploring the dependence of hot Jupiter occurrence rates on stellar mass with TESS
Kunimoto, M.; Beleznay, Maya
We present estimates for the occurrence rates of hot Jupiters around dwarf stars based on data from the Transiting Exoplanet Survey Satellite (TESS) Prime Mission. We take 97 hot Jupiters orbiting 198 721 AFG dwarf stars (ranging in mass from 0.8 to $2.3\, {\rm M}_{\odot }$) from an independent search for hot Jupiters using TESS Prime Mission data…
INTEGRAL/IBIS 17-yr hard X-ray all-sky survey
Tsygankov, Sergey S.; Lutovinov, Alexander A.; Krivonos, Roman A. +3 more
The International Gamma-Ray Astrophysics Laboratory (INTEGRAL), launched in 2002, continues its successful work in observing the sky at energies E > 20 keV. The legacy of the mission already includes a large number of discovered or previously poorly studied hard X-ray sources. The growing INTEGRAL archive allows one to conduct an all-sky survey…
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…
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…
H α morphologies of star clusters in 16 LEGUS galaxies: Constraints on H II region evolution time-scales
Boquien, M.; Calzetti, D.; Adamo, A. +14 more
The analysis of star cluster ages in tandem with the morphology of their H II regions can provide insight into the processes that clear a cluster's natal gas, as well as the accuracy of cluster ages and dust reddening derived from Spectral Energy Distribution (SED) fitting. We classify 3757 star clusters in 16 nearby galaxies according to their H …