Search Publications
The Fall of a Giant. Chemical evolution of Enceladus, alias the Gaia Sausage
Silva Aguirre, Victor; Matteucci, Francesca; Miglio, Andrea +4 more
We present the first chemical evolution model for Enceladus, alias the Gaia Sausage, to investigate the star formation history of one of the most massive satellites accreted by the Milky Way during a major merger event. Our best chemical evolution model for Enceladus nicely fits the observed stellar [α/Fe]-[Fe/H] chemical abundance trends, and rep…
Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons
Massey, Richard; Jauzac, Mathilde; Harvey, David +5 more
We present BAHAMAS-SIDM, the first large-volume, (400 h^{-1} Mpc)3, cosmological simulations including both self-interacting dark matter (SIDM) and baryonic physics. These simulations are important for two primary reasons: (1) they include the effects of baryons on the dark matter distribution and (2) the baryon particles can be used to…
High Density Reflection Spectroscopy - II. The density of the inner black hole accretion disc in AGN
Fabian, Andrew C.; Reynolds, Christopher S.; Walton, Dominic J. +7 more
We present a high density disc reflection spectral analysis of a sample of 17 Seyfert 1 galaxies to study the inner disc densities at different black hole mass scales and accretion rates. All the available XMM-Newton observations in the archive are used. OM observations in the optical/UV band are used to estimate their accretion rates. We find tha…
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14
Kepler, S. O.; Pelisoli, Ingrid; Romero, Alejandra D. +6 more
White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs provide insight into the early ages of each population. Examining the spectra of all stars with 3σ proper motion in the Sloan Digital Sky Survey Data Release 14, we rep…
Constraining the Milky Way halo potential with the GD-1 stellar stream
Malhan, Khyati; Ibata, Rodrigo A.
We use ESA/Gaia astrometry together with SEGUE and LAMOST measurements of the GD-1 stellar stream to explore the improvement on the Galactic gravitational potential that these new data provide. Assuming a realistic universal model for the dark matter halo together with reasonable models of the baryonic components, we find that the orbital solution…
An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: source catalogue and properties
Thomson, A. P.; Ivison, R. J.; Kocevski, Dale D. +26 more
We present the catalogue and basic properties of sources in AS2UDS, an 870-µm continuum survey with the Atacama Large Millimetre/sub-millimetre Array (ALMA) of 716 single-dish sub-millimetre sources detected in the UKIDSS/UDS field by the SCUBA-2 Cosmology Legacy Survey. In our sensitive ALMA follow-up observations, we detect 708 sub-millime…
The Nucleus of comet 67P/Churyumov-Gerasimenko - Part I: The global view - nucleus mass, mass-loss, porosity, and implications
Tellmann, Silvia; Pätzold, Martin; Häusler, Bernd +7 more
The radio science experiment RSI on-board Rosetta determined the mass of the nucleus of comet 67P/Churyumov-Gerasimenko at the start of the prime mission from 2014 August to November (GM = 666.2 ± 0.2 m3 s-2 or 9982 ± 3 × 1012 kg) and shortly before the end of the mission from 2016 July to September (GM …
Low-mass halo perturbations in strong gravitational lenses at redshift z ∼ 0.5 are consistent with CDM
Vegetti, S.; McKean, J. P.; Auger, M. W. +3 more
We use a sample of 17 strong gravitational lens systems from the BELLS GALLERY survey to quantify the amount of low-mass dark matter haloes within the lensing galaxies and along their lines of sight, and to constrain the properties of dark matter. Based on a detection criterion of 10σ, we report no significant detection in any of the lenses. Using…
Architectures of exoplanetary systems - I. A clustered forward model for exoplanetary systems around Kepler's FGK stars
Ford, Eric B.; Ragozzine, Darin; He, Matthias Y.
Observations of exoplanetary systems provide clues about the intrinsic distribution of planetary systems, their architectures, and how they formed. We develop a forward modelling framework for generating populations of planetary systems and `observed' catalogues by simulating the Kepler detection pipeline (SysSim). We compare our simulated catalog…
Discovery of an equal-mass `twin' binary population reaching 1000 + au separations
Tian, Haijun; Duchêne, Gaspard; Rix, Hans-Walter +2 more
We use a homogeneous catalogue of 42 000 main-sequence wide binaries identified by Gaia to measure the mass ratio distribution, p(q), of binaries with primary masses 0.1 < M1/M⊙ < 2.5, mass ratios 0.1 ≲ q < 1, and separations 50 < s/au < 50 000. A well-understood selection function allows us to constrain p(q) i…