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The VIMOS Ultra-Deep Survey: evidence for AGN feedback in galaxies with CIII]-λ1908 Å emission 10.8 to 12.5 Gyr ago
Maccagni, D.; Cimatti, A.; Schaerer, D. +19 more
We analyze the CIII]-λ1908 Å emission properties in a sample of 3899 star-forming galaxies (SFGs) at 2 < z < 3.8 drawn from the VIMOS Ultra-Deep Survey (VUDS). We find a median rest-frame equivalent width EW(CIII]) = 2.0 ± 0.2 to 2.2 ± 0.2 Å for the whole SFG population at 2 < z < 3 and 3 < z < 4, respectively. About 24% of SFGs …
A multimessenger study of the Milky Way's stellar disc and bulge with LISA, Gaia, and LSST
Korol, Valeriya; Rossi, Elena M.; Barausse, Enrico
The upcoming Laser Interferometer Space Antenna (LISA) mission offers the unique opportunity to study the Milky Way through gravitational wave (GW) radiation from a large population of Galactic binaries. Among the variety of Galactic GW sources, LISA is expected to individually resolve signals from ∼105 ultra-compact double white dwarf …
A Comprehensive Spectroscopic and Photometric Analysis of DA and DB White Dwarfs from SDSS and Gaia
Genest-Beaulieu, C.; Bergeron, P.
We present a detailed spectroscopic and photometric analysis of DA and DB white dwarfs drawn from the Sloan Digital Sky Survey with trigonometric parallax measurements available from the Gaia mission. The temperature and mass scales obtained from fits to ugriz photometry appear reasonable for both DA and DB stars, with almost identical mean masses…
A Survey for New Members of Taurus from Stellar to Planetary Masses
Luhman, K. L.; Esplin, T. L.
We present a large sample of new members of the Taurus star-forming region that extend from stellar to planetary masses. To identify candidate members at substellar masses, we have used color-magnitude diagrams and proper motions measured with several wide-field optical and infrared (IR) surveys. At stellar masses, we have considered the candidate…
Structure, kinematics, and ages of the young stellar populations in the Orion region
Brown, A. G. A.; de Zeeuw, P. T.; Zari, E.
We present a study of the three dimensional structure, kinematics, and age distribution of the Orion OB association, based on the second data release of the Gaia satellite (Gaia DR2). Our goal is to obtain a complete picture of the star formation history of the Orion complex and to relate our findings to theories of sequential and triggered star f…
Space test of the equivalence principle: first results of the MICROSCOPE mission
Bergé, Joel; Chhun, Ratana; Métris, Gilles +31 more
The weak equivalence principle (WEP), stating that two bodies of different compositions and/or mass fall at the same rate in a gravitational field (universality of free fall), is at the very foundation of general relativity. The MICROSCOPE mission aims to test its validity to a precision of 10-15, two orders of magnitude better than cur…
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 …
A loud quasi-periodic oscillation after a star is disrupted by a massive black hole
Steiner, James F.; Remillard, Ronald A.; Homan, Jeroen +9 more
The tidal forces close to massive black holes can rip apart stars that come too close to them. As the resulting stellar debris spirals toward the black hole, the debris heats up and emits x-rays. We report observations of a stable 131-second x-ray quasi-periodic oscillation from the tidal disruption event ASASSN-14li. Assuming the black hole mass …
Praesepe (NGC 2632) and its tidal tails
Röser, Siegfried; Schilbach, Elena
Aims: Within a 400 pc sphere around the Sun, we search for Praesepe's tidal tails in the Gaia Data Release 2 (DR2) data set.
Methods: We used a modified convergent-point method to find stars with space velocities close to the space velocity of the Praesepe cluster.
Results: We find a clear indication for the existence of Praesepe's …
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 …