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The Pristine survey - VI. The first three years of medium-resolution follow-up spectroscopy of Pristine EMP star candidates
Sestito, Federico; Navarro, Julio F.; Martin, Nicolas +27 more
We present the results of a 3-yr long, medium-resolution spectroscopic campaign aimed at identifying very metal-poor stars from candidates selected with the CaHK, metallicity-sensitive Pristine survey. The catalogue consists of a total of 1007 stars, and includes 146 rediscoveries of metal-poor stars already presented in previous surveys, 707 new …
Dark Energy Surveyed Year 1 results: calibration of cluster mis-centring in the redMaPPer catalogues
Bechtol, K.; Smith, M.; Allam, S. +84 more
The centre determination of a galaxy cluster from an optical cluster finding algorithm can be offset from theoretical prescriptions or N-body definitions of its host halo centre. These offsets impact the recovered cluster statistics, affecting both richness measurements and the weak lensing shear profile around the clusters. This paper models the …
HELP: a catalogue of 170 million objects, selected at 0.36-4.5 µm, from 1270 deg2 of prime extragalactic fields
Oliver, Seb; Vaccari, Mattia; Farrah, Duncan +15 more
We present an optical to near-infrared (NIR) selected astronomical catalogue covering 1270 deg2. This is the first attempt to systematically combine data from 23 of the premier extragalactic survey fields - the product of a vast investment of telescope time. The fields are those imaged by the Herschel Space Observatory that form the Her…
An emission spectrum for WASP-121b measured across the 0.8-1.1 µm wavelength range using the Hubble Space Telescope
Deming, Drake; Nikolov, Nikolay; Carter, Aarynn L. +11 more
WASP-121b is a transiting gas giant exoplanet orbiting close to its Roche limit, with an inflated radius nearly double that of Jupiter and a dayside temperature comparable to a late M dwarf photosphere. Secondary eclipse observations covering the 1.1-1.6 µm wavelength range have revealed an atmospheric thermal inversion on the dayside hemisp…
Probing 3D structure with a large MUSE mosaic: extending the mass model of Frontier Field Abell 370
Carton, David; Mahler, Guillaume; Richard, Johan +12 more
We present an updated strong-lensing analysis of the massive cluster Abell 370 (A370), continuing the work first presented in L17. In this new analysis, we take advantage of the deeper imaging data from the Hubble Space Telescope Frontier Fields programme, as well as a large spectroscopic mosaic obtained with the Multi-Unit Spectroscopic Explorer …
Globular cluster number density profiles using Gaia DR2
Balbinot, E.; Hénault-Brunet, V.; Gieles, M. +4 more
Using data from Gaia DR2, we study the radial number density profiles of the Galactic globular cluster sample. Proper motions are used for accurate membership selection, especially crucial in the cluster outskirts. Due to the severe crowding in the centres, the Gaia data are supplemented by literature data from HST and surface brightness measureme…
Imaging [CI] around HD 131835: reinterpreting young debris discs with protoplanetary disc levels of CO gas as shielded secondary discs
Kral, Quentin; Wyatt, Mark C.; Marino, Sebastian +2 more
Despite being >10 Myr, there are ∼10 debris discs with as much CO gas as in protoplanetary discs. Such discs have been assumed to be 'hybrid', i.e. with secondary dust but primordial gas. Here, we show that both the dust and gas in such systems could instead be secondary, with the high CO content caused by accumulation of neutral carbon (C…
Linking galaxy structural properties and star formation activity to black hole activity with IllustrisTNG
Somerville, Rachel S.; Torrey, Paul; Vogelsberger, Mark +11 more
We study the connection between active galactic nuclei (AGN) and their host galaxies through cosmic time in the large-scale cosmological IllustrisTNG simulations. We first compare BH properties, i.e. the hard X-ray BH luminosity function, AGN galaxy occupation fraction, and distribution of Eddington ratios, to available observational constraints. …
The refractory-to-ice mass ratio in comets
Blum, J.; Gundlach, B.; Mottola, S. +6 more
We review the complex relationship between the dust-to-gas mass ratio usually estimated in the material lost by comets, and the refractory-to-ice mass ratio inside the nucleus, which constrains the origin of comets. Such a relationship is dominated by the mass transfer from the perihelion erosion to fallout over most of the nucleus surface. This m…
A quantitative analysis of systematic differences in the positions and proper motions of Gaia DR2 with respect to VLBI
Petrov, L.; Kovalev, Y. Y.; Plavin, A. V.
We have analysed the differences in positions of 9081 matched sources between the Gaia Data Release 2 (DR2) and very long baseline interferometry (VLBI) catalogues. The median position uncertainty of matched sources in the VLBI catalogue is a factor of two larger than the median position uncertainty in Gaia DR2. There are 9 per cent matched source…