Search Publications
Modelling chemical abundance distributions for dwarf galaxies in the Local Group: the impact of turbulent metal diffusion
Faucher-Giguère, Claude-André; Hopkins, Philip F.; Wetzel, Andrew +6 more
We investigate stellar metallicity distribution functions (MDFs), including Fe and α-element abundances, in dwarf galaxies from the Feedback in Realistic Environment (FIRE) project. We examine both isolated dwarf galaxies and those that are satellites of a Milky Way-mass galaxy. In particular, we study the effects of including a sub-grid turbulent…
Imprints of white dwarf recoil in the separation distribution of Gaia wide binaries
Rix, Hans-Walter; El-Badry, Kareem
We construct from Gaia DR2 an extensive and very pure ({≲ } 0.2{{ per cent}} contamination) catalogue of wide binaries containing main-sequence (MS) and white dwarf (WD) components within 200 pc of the Sun. The public catalogue contains, after removal of clusters and resolved higher order multiples, > 50 000 MS/MS, > 3000 WD/MS, and nearly 4…
Systematic study of magnetar outbursts
Esposito, Paolo; Rea, Nanda; Coti Zelati, Francesco +2 more
We present the results of the systematic study of all magnetar outbursts observed to date, through a reanalysis of data acquired in about 1100 X-ray observations. We track the temporal evolution of the outbursts' soft X-ray spectral properties and the luminosities of the single spectral components as well as of the total emission. We model empiric…
“Super-deblended” Dust Emission in Galaxies. I. The GOODS-North Catalog and the Cosmic Star Formation Rate Density out to Redshift 6
Dickinson, Mark; Inami, Hanae; Daddi, Emanuele +10 more
We present a new technique to measure multi-wavelength “super-deblended” photometry from highly confused images, which we apply to Herschel and ground-based far-infrared (FIR) and (sub-)millimeter (mm) data in the northern field of the Great Observatories Origins Deep Survey. There are two key novelties. First, starting with a large database of de…
The Disk Substructures at High Angular Resolution Project (DSHARP). IX. A High-definition Study of the HD 163296 Planet-forming Disk
Wilner, David J.; Andrews, Sean M.; Guzmán, Viviana V. +11 more
The Atacama Large Millimeter/submillimeter Array observations of protoplanetary disks acquired by the Disk Substructure at High Angular Resolution Project resolve the dust and gas emission on angular scales as small as 3 astronomical units, offering an unprecedented detailed view of the environment where planets form. In this Letter, we present an…
VIRAC: the VVV Infrared Astrometric Catalogue
Minniti, D.; Gromadzki, M.; Marocco, F. +12 more
We present VIRAC version 1, a near-infrared proper motion and parallax catalogue of the VISTA Variables in the Via Lactea (VVV) survey for 312 587 642 unique sources averaged across all overlapping pawprint and tile images covering 560 deg2 of the bulge of the Milky Way and southern disc. The catalogue includes 119 million high-quality …
The Missing Satellites of the Magellanic Clouds? Gaia Proper Motions of the Recently Discovered Ultra-faint Galaxies
van der Marel, Roeland P.; Navarro, Julio F.; Sacchi, Elena +7 more
According to LCDM theory, hierarchical evolution occurs on all mass scales, implying that satellites of the Milky Way should also have companions. The recent discovery of ultra-faint dwarf galaxy candidates in close proximity to the Magellanic Clouds provides an opportunity to test this theory. We present proper motion (PM) measurements for 13 of …
No evidence for a significant AGN contribution to cosmic hydrogen reionization
Dunlop, James S.; McLure, Ross J.; Parsa, Shaghayegh
We reinvestigate a claimed sample of 22 X-ray detected active galactic nuclei (AGN) at redshifts z > 4, which has reignited the debate as to whether young galaxies or AGN reionized the Universe. These sources lie within the Great Observatories Origins Deep Survey-South (GOODS-S)/Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey (CA…
3D shape of Orion A from Gaia DR2
Meingast, Stefan; Alves, João; Bouy, Hervé +16 more
We use the Gaia DR2 distances of about 700 mid-infrared selected young stellar objects in the benchmark giant molecular cloud Orion A to infer its 3D shape and orientation. We find that Orion A is not the fairly straight filamentary cloud that we see in (2D) projection, but instead a cometary-like cloud oriented toward the Galactic plane, with two…
LOFAR/H-ATLAS: the low-frequency radio luminosity-star formation rate relation
Prandoni, I.; Tasse, C.; Hardcastle, M. J. +11 more
Radio emission is a key indicator of star formation activity in galaxies, but the radio luminosity-star formation relation has to date been studied almost exclusively at frequencies of 1.4 GHz or above. At lower radio frequencies, the effects of thermal radio emission are greatly reduced, and so we would expect the radio emission observed to be co…