Search Publications
An uncontaminated measurement of the escaping Lyman continuum at z 3
Steidel, Charles C.; Reddy, Naveen A.; Shapley, Alice +2 more
Observations of reionization-era analogues at z ~ 3 are a powerful tool for constraining reionization. Rest-ultraviolet observations are particularly useful, in which both direct and indirect tracers of ionizing-photon production and escape can be observed. We analyse a sample of 124 z ~ 3 galaxies from the Keck Lyman Continuum Spectroscopic Surve…
The evolution of the galaxy stellar-mass function over the last 12 billion years from a combination of ground-based and HST surveys
Cullen, F.; McLure, R. J.; Dunlop, J. S. +3 more
We present a new determination of the galaxy stellar-mass function (GSMF) over the redshift interval 0.25 ≤ z ≤ 3.75, derived from a combination of ground-based and Hubble Space Telescope (HST) imaging surveys. Based on a near-IR-selected galaxy sample selected over a raw survey area of 3 deg2 and spanning ≥4 dex in stellar mass, we fit…
Spatially resolved star formation and inside-out quenching in the TNG50 simulation and 3D-HST observations
Mowla, Lamiya; van Dokkum, Pieter; Johnson, Benjamin D. +22 more
We compare the star-forming main sequence (SFMS) of galaxies - both integrated and resolved on 1 kpc scales - between the high-resolution TNG50 simulation of IllustrisTNG and observations from the 3D-HST slitless spectroscopic survey at z ~ 1. Contrasting integrated star formation rates (SFRs), we find that the slope and normalization of the star-…
Discovery and follow-up of ASASSN-19dj: an X-ray and UV luminous TDE in an extreme post-starburst galaxy
Kochanek, C. S.; Foley, R. J.; Stalder, B. +28 more
We present observations of ASASSN-19dj, a nearby tidal disruption event (TDE) discovered in the post-starburst galaxy KUG 0810+227 by the All-Sky Automated Survey for Supernovae (ASAS-SN) at a distance of d ≃ 98 Mpc. We observed ASASSN-19dj from -21 to 392 d relative to peak ultraviolet (UV)/optical emission using high-cadence, multiwavelength spe…
Photoevaporation versus core-powered mass-loss: model comparison with the 3D radius gap
Owen, James E.; Schlichting, Hilke E.; Rogers, James G. +1 more
The extreme ultraviolet (EUV)/X-ray photoevaporation and core-powered mass-loss models are both capable of reproducing the bimodality in the sizes of small, close-in exoplanets observed by the Kepler space mission, often referred to as the 'radius gap'. However, it is unclear which of these two mechanisms dominates the atmospheric mass-loss that i…
Evidence of a population of dark subhaloes from Gaia and Pan-STARRS observations of the GD-1 stream
Bovy, Jo; Erkal, Denis; Bertone, Gianfranco +2 more
New data from the Gaia satellite, when combined with accurate photometry from the Pan-STARRS survey, allow us to accurately estimate the properties of the GD-1 stream. Here, we analyse the stellar density variations in the GD-1 stream and show that they cannot be due to known baryonic structures such as giant molecular clouds, globular clusters, o…
Detection of the LMC-induced sloshing of the Galactic halo
Bird, Sarah A.; Zhao, Gang; Erkal, Denis +8 more
A wealth of recent studies have shown that the LMC is likely massive, with a halo mass >1011 M⊙. One consequence of having such a nearby and massive neighbour is that the inner Milky Way is expected to be accelerated with respect to our Galaxy's outskirts (beyond ~30 kpc). In this work, we compile a sample of ~500 stars wi…
FINK, a new generation of broker for the LSST community
Karpov, Sergey; Savchenko, Volodymyr; Coleiro, Alexis +33 more
FINK is a broker designed to enable science with large time-domain alert streams such as the one from the upcoming Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). It exhibits traditional astronomy broker features such as automatized ingestion, annotation, selection, and redistribution of promising alerts for transient science. It…
Galactic seismology: the evolving 'phase spiral' after the Sagittarius dwarf impact
Bland-Hawthorn, Joss; Tepper-García, Thor
In 2018, the ESA Gaia satellite discovered a remarkable spiral pattern ('phase spiral') in the z - Vz phase plane throughout the solar neighbourhood, where z and Vz are the displacement and velocity of a star perpendicular to the Galactic disc. In response to Binney & Schönrich's analytic model of a disc-crossing satellit…
Resonance sweeping by a decelerating Galactic bar
Schönrich, Ralph; Chiba, Rimpei; Friske, Jennifer K. S.
We provide the first quantitative evidence for the deceleration of the Galactic bar from local stellar kinematics in agreement with dynamical friction by a typical dark matter halo. The kinematic response of the stellar disc to a decelerating bar is studied using secular perturbation theory and test particle simulations. We show that the velocity …