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Gaia Reveals a Metal-rich, in situ Component of the Local Stellar Halo
Conroy, Charlie; Bonaca, Ana; Hopkins, Philip F. +2 more
We use the first Gaia data release, combined with the RAVE and APOGEE spectroscopic surveys, to investigate the origin of halo stars within ≲ 3 kpc from the Sun. We identify halo stars kinematically as moving at a relative speed of at least 220 km s-1 with respect to the local standard of rest. These stars are generally less metal-rich …
Planck intermediate results. LI. Features in the cosmic microwave background temperature power spectrum and shifts in cosmological parameters
Kim, J.; Miville-Deschênes, M. -A.; Planck Collaboration +155 more
The six parameters of the standard ΛCDM model have best-fit values derived from the Planck temperature power spectrum that are shifted somewhat from the best-fit values derived from WMAP data. These shifts are driven by features in the Planck temperature power spectrum at angular scales that had never before been measured to cosmic-variance level …
The anatomy of the Orion B giant molecular cloud: A local template for studies of nearby galaxies
Pety, Jérôme; Guzmán, Viviana V.; Öberg, Karin I. +11 more
Context. Molecular lines and line ratios are commonly used to infer properties of extra-galactic star forming regions. The new generation of millimeter receivers almost turns every observation into a line survey. Full exploitation of this technical advancement in extra-galactic study requires detailed bench-marking of available line diagnostics. <…
The VLA-COSMOS 3 GHz Large Project: The infrared-radio correlation of star-forming galaxies and AGN to z ≲ 6
Bondi, M.; Berta, S.; Magnelli, B. +23 more
We examine the behaviour of the infrared-radio correlation (IRRC) over the range 0 <z ≲ 6 using new, highly sensitive 3 GHz observations with the Karl G. Jansky Very Large Array (VLA) and infrared data from the Herschel Space Observatory in the 2 deg2 COSMOS field. We distinguish between objects where emission is believed to arise so…
An improved model of diffuse galactic radio emission from 10 MHz to 5 THz
Reich, W.; Liu, A.; Reich, P. +6 more
We present an improved Global Sky Model (GSM) of diffuse Galactic radio emission from 10 MHz to 5 THz, whose uses include foreground modelling for cosmic microwave background (CMB) and 21 cm cosmology. Our model improves on past work both algorithmically and by adding new data sets such as the Planck maps and the enhanced Haslam map. Our method ge…
PS16dtm: A Tidal Disruption Event in a Narrow-line Seyfert 1 Galaxy
Berger, E.; Chornock, R.; Nicholl, M. +6 more
We present observations of PS16dtm (also known as SN 2016ezh), a luminous transient that occurred at the nucleus of a narrow-line Seyfert 1 galaxy hosting a 106 M ⊙ black hole. The light curve shows that PS16dtm exhibited a plateau phase for ∼100 days, during which it showed no color evolution, maintained a blackbody temperat…
H0LiCOW - IV. Lens mass model of HE 0435-1223 and blind measurement of its time-delay distance for cosmology
Treu, Tommaso; Marshall, Philip J.; Sonnenfeld, Alessandro +13 more
Strong gravitational lenses with measured time delays between the multiple images allow a direct measurement of the time-delay distance to the lens, and thus a measure of cosmological parameters, particularly the Hubble constant, H0. We present a blind lens model analysis of the quadruply imaged quasar lens HE 0435-1223 using deep Hubbl…
Ultraviolet spectra of extreme nearby star-forming regions - approaching a local reference sample for JWST
Feltre, Anna; Charlot, Stéphane; Chevallard, Jacopo +7 more
Nearby dwarf galaxies provide a unique laboratory in which to test stellar population models below Z⊙/2. Such tests are particularly important for interpreting the surprising high-ionization ultraviolet (UV) line emission detected at z > 6 in recent years. We present HST/COS UV spectra of 10 nearby metal-poor star-forming galaxies se…
Deriving a multivariate αCO conversion function using the [C II]/CO (1-0) ratio and its application to molecular gas scaling relations
Genzel, R.; Sturm, E.; Tacconi, L. J. +17 more
We present Herschel PACS observations of the [C II] 158 µm emission line in a sample of 24 intermediate mass (9 < log M*/M⊙ < 10) and low metallicity (0.4 < Z/Z⊙ < 1.0) galaxies from the xCOLD GASS survey. In combination with IRAM CO (1-0) measurements, we establish scaling relations between integ…
Constraints on neutrino masses from Lyman-alpha forest power spectrum with BOSS and XQ-100
Palanque-Delabrouille, Nathalie; Yèche, Christophe; Baur, Julien +1 more
We present constraints on masses of active and sterile neutrinos in the context of the ΛCDMν and ΛWDM models, respectively. We use the one-dimensional Lyα-forest power spectrum from the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey (SDSS-III) measured by Palanque-Delabrouille et al. [1], and from the VLT/XSHOOTER l…