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Improved Dynamical Constraints on the Masses of the Central Black Holes in Nearby Low-mass Early-type Galactic Nuclei and the First Black Hole Determination for NGC 205
Pechetti, Renuka; Neumayer, Nadine; Strader, Jay +17 more
We improve the dynamical black hole (BH) mass estimates in three nearby low-mass early-type galaxies: NGC 205, NGC 5102, and NGC 5206. We use new Hubble Space Telescope (HST)/STIS spectroscopy to fit the star formation histories of the nuclei in these galaxies, and use these measurements to create local color-mass-to-light ratio (M/L) relations. W…
Refinement of the standard halo model for dark matter searches in light of the Gaia Sausage
Evans, N. Wyn; McCabe, Christopher; O'Hare, Ciaran A. J.
Predicting signals in experiments to directly detect dark matter (DM) requires a form for the local DM velocity distribution. Hitherto, the standard halo model (SHM), in which velocities are isotropic and follow a truncated Gaussian law, has performed this job. New data, however, suggest that a substantial fraction of our stellar halo lies in a st…
On the Measurement of Fundamental Parameters of White Dwarfs in the Gaia Era
Fontaine, G.; Genest-Beaulieu, C.; Bergeron, P. +5 more
We present a critical review of the determination of fundamental parameters of white dwarfs discovered by the Gaia mission. We first reinterpret color-magnitude and color-color diagrams using photometric and spectroscopic information contained in the Montreal White Dwarf Database (MWDD), combined with synthetic magnitudes calculated from a self-co…
Accretion of a giant planet onto a white dwarf star
Gänsicke, Boris T.; Schreiber, Matthias R.; Toloza, Odette +3 more
The detection1 of a dust disk around the white dwarf star G29-38 and transits from debris orbiting the white dwarf WD 1145+017 (ref. 2) confirmed that the photospheric trace metals found in many white dwarfs3 arise from the accretion of tidally disrupted planetesimals4. The composition of these planetesi…
Three-dimensional interstellar dust reddening maps of the Galactic plane
Huang, Y.; Chen, B. -Q.; Wang, C. +6 more
We present new three-dimensional (3D) interstellar dust reddening maps of the Galactic plane in three colours, E(G - KS), E(GBP - GRP), and E(H - KS). The maps have a spatial angular resolution of 6 arcmin and covers over 7000 deg2 of the Galactic plane for Galactic longitude 0° < l < 36…
The Evolution and Origin of Ionized Gas Velocity Dispersion from z ∼ 2.6 to z ∼ 0.6 with KMOS3D
Lutz, D.; Wuyts, S.; Förster Schreiber, N. M. +27 more
We present the 0.6 < z < 2.6 evolution of the ionized gas velocity dispersion in 175 star-forming disk galaxies based on data from the full KMOS3D integral field spectroscopic survey. In a forward-modeling Bayesian framework including instrumental effects and beam-smearing, we fit simultaneously the observed galaxy velocity and ve…
Low-frequency gravity waves in blue supergiants revealed by high-precision space photometry
Bowman, Dominic M.; Pope, Benjamin J. S.; White, Timothy R. +14 more
Almost all massive stars explode as supernovae and form a black hole or neutron star. The remnant mass and the impact of the chemical yield on subsequent star formation and galactic evolution strongly depend on the internal physics of the progenitor star, which is currently not well understood. The theoretical uncertainties of stellar interiors ac…
Distances and parallax bias in Gaia DR2
Schönrich, Ralph; Eyer, Laurent; McMillan, Paul
We derive Bayesian distances for all stars in the radial velocity sample of Gaia DR2, and use the statistical method of Schönrich, Binney & Asplund to validate the distances and test the Gaia parallaxes. In contrast to other methods, which rely on special sources, our method directly tests the distances to all stars in our sample. We find clea…
K2 Rotation Periods for Low-mass Hyads and a Quantitative Comparison of the Distribution of Slow Rotators in the Hyades and Praesepe
Cargile, P. A.; Agüeros, M. A.; Douglas, S. T. +4 more
We analyze K2 light curves for 132 low-mass (1 M ⊙ ≳ M * ≳ 0.1 M ⊙) members of the 600-800 Myr old Hyades cluster and measure rotation periods ({P}rot}) for 116 of these stars. These include 93 stars with no prior {P}rot} measurements; the total number of Hyads with a known {P}rot} …
Short GRB 160821B: A Reverse Shock, a Refreshed Shock, and a Well-sampled Kilonova
Pian, E.; Greiner, J.; Fruchter, A. S. +31 more
We report our identification of the optical afterglow and host galaxy of the short-duration gamma-ray burst sGRB 160821B. The spectroscopic redshift of the host is z = 0.162, making it one of the lowest redshift short-duration gamma-ray bursts (sGRBs) identified by Swift. Our intensive follow-up campaign using a range of ground-based facilities as…