Search Publications
The synchrony of production and escape: half the bright Lyα emitters at z ≈ 2 have Lyman continuum escape fractions ≈50 per cent
Hayes, Matthew; Conroy, Charlie; Schaerer, Daniel +14 more
The ionizing photon escape fraction [Lyman continuum (LyC) fesc] of star-forming galaxies is the single greatest unknown in the reionization budget. Stochastic sightline effects prohibit the direct separation of LyC leakers from non-leakers at significant redshifts. Here we circumvent this uncertainty by inferring fesc using …
A classifier for spurious astrometric solutions in Gaia eDR3
Rix, Hans-Walter; Udalski, Andrzej; Gould, Andrew +6 more
The Gaia early Data Release 3 has delivered exquisite astrometric data for 1.47 billion sources, which is revolutionizing many fields in astronomy. For a small fraction of these sources, the astrometric solutions are poor, and the reported values and uncertainties may not apply. Before any analysis, it is important to recognize and excise these sp…
The ALMA REBELS Survey: dust continuum detections at z > 6.5
Inami, Hanae; Nanayakkara, Themiya; Ferrara, Andrea +25 more
We report 18 dust continuum detections (≥3.3σ) at ~88 and 158 $\mu{\rm m}$ out of 49 ultraviolet (UV)-bright galaxies (MUV < -21.3 mag) at $z$ > 6.5, observed by the Cycle-7 Atacama Large Millimeter/submillimeter Array (ALMA) Large Program, Reionization-Era Bright Emission Line Survey (REBELS) and its pilot programs. This has more…
The GALAH Survey: chemical tagging and chrono-chemodynamics of accreted halo stars with GALAH+ DR3 and Gaia eDR3
Lewis, Geraint F.; Ting, Yuan-Sen; Feuillet, Diane K. +27 more
Since the advent of Gaia astrometry, it is possible to identify massive accreted systems within the Galaxy through their unique dynamical signatures. One such system, Gaia-Sausage-Enceladus (GSE), appears to be an early 'building block' given its virial mass $\gt 10^{10}\, \mathrm{M_\odot }$ at infall (z ~ 1-3). In order to separate the progenitor…
A stringent upper limit on dark matter self-interaction cross-section from cluster strong lensing
Andrade, Kevin E.; Fuson, Jackson; Gad-Nasr, Sophia +4 more
We analyse strongly lensed images in eight galaxy clusters to measure their dark matter density profiles in the radial region between 10 kpc and 150 kpc, and use this to constrain the self-interaction cross-section of dark matter (DM) particles. We infer the mass profiles of the central DM haloes, bright central galaxies, key member galaxies, and …
Constraining the evolution of cataclysmic variables via the masses and accretion rates of their underlying white dwarfs
Reichart, D. E.; Knigge, C.; Gänsicke, B. T. +28 more
We report on the masses (MWD), effective temperatures ($\rm{T_\mathrm{eff}}$), and secular mean accretion rates ($\langle \dot{M} \rangle$) of 43 cataclysmic variable (CV) white dwarfs, 42 of which were obtained from the combined analysis of their Hubble Space Telescope ultraviolet data with the parallaxes provided by the Early Third Da…
ARIADNE: measuring accurate and precise stellar parameters through SED fitting
Jenkins, James S.; Vines, Jose I.
Accurately measuring stellar parameters is a key goal to increase our understanding of the observable Universe. However, current methods are limited by many factors, in particular, the biases and physical assumptions that are the basis for the underlying evolutionary or atmospheric models, those that these methods rely upon. Here, we introduce our…
The eccentricity distribution of wide binaries and their individual measurements
Ting, Yuan-Sen; Zakamska, Nadia L.; Hwang, Hsiang-Chih
Eccentricity of wide binaries is difficult to measure due to their long orbital periods. With Gaia's high-precision astrometric measurements, eccentricity of a wide binary can be constrained by the angle between the separation vector and the relative velocity vector (the v-r angle). In this paper, by using the v-r angles of wide binaries in Gaia E…
Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using PYCHEOPS
Guterman, P.; Alonso, R.; Deleuil, M. +77 more
CHEOPS (CHaracterising ExOPlanet Satellite) is an ESA S-class mission that observes bright stars at high cadence from low-Earth orbit. The main aim of the mission is to characterize exoplanets that transit nearby stars using ultrahigh precision photometry. Here, we report the analysis of transits observed by CHEOPS during its Early Science observi…
The chemo-dynamical groups of Galactic globular clusters
Grand, Robert J. J.; Marinacci, Federico; Deason, Alis J. +3 more
We introduce a multicomponent chemo-dynamical method for splitting the Galactic population of globular clusters (GCs) into three distinct constituents: bulge, disc, and stellar halo. The latter is further decomposed into the individual large accretion events that built up the Galactic stellar halo: the Gaia-Enceladus-Sausage, Kraken and Sequoia st…