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Hot Stuff for One Year (HSOY). A 583 million star proper motion catalogue derived from Gaia DR1 and PPMXL
Demleitner, M.; Bastian, U.; Altmann, M. +2 more
Context. Recently, the first installment of data from the ESA Gaia astrometric satellite mission (Gaia DR1) was released, containing positions of more than 1 billion stars with unprecedented precision. This release contains the proper motions and parallaxes, however, for only a subset of 2 million objects. The second release will include those qua…
An HST/COS legacy survey of high-velocity ultraviolet absorption in the Milky Way's circumgalactic medium and the Local Group
Wakker, B. P.; Lehner, N.; Muzahid, S. +9 more
Context. The Milky Way is surrounded by large amounts of diffuse gaseous matter that connects the stellar body of our Galaxy with its large-scale Local Group (LG) environment.
Aims: To characterize the absorption properties of this circumgalactic medium (CGM) and its relation to the LG we present the so-far largest survey of metal absorption …
Alma Observations of Massive Molecular Gas Filaments Encasing Radio Bubbles in the Phoenix Cluster
Bayliss, M. B.; Fabian, A. C.; Hlavacek-Larrondo, J. +11 more
We report new ALMA observations of the CO(3-2) line emission from the 2.1+/- 0.3× {10}10 {M}⊙ molecular gas reservoir in the central galaxy of the Phoenix cluster. The cold molecular gas is fueling a vigorous starburst at a rate of 500{--}800 {M}⊙ {{yr}}-1 and powerful black hole activity in the forms …
Determining H0 with Bayesian hyper-parameters
Kunz, Martin; Pettorino, Valeria; Cardona, Wilmar
We re-analyse recent Cepheid data to estimate the Hubble parameter H0 by using Bayesian hyper-parameters (HPs). We consider the two data sets from Riess et al. 2011 and 2016 (labelled R11 and R16, with R11 containing less than half the data of R16) and include the available anchor distances (megamaser system NGC4258, detached eclipsing …
Galaxy Zoo: quantitative visual morphological classifications for 48 000 galaxies from CANDELS
Finkelstein, Steven L.; Barro, Guillermo; Bell, Eric F. +46 more
We present quantified visual morphologies of approximately 48 000 galaxies observed in three Hubble Space Telescope legacy fields by the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and classified by participants in the Galaxy Zoo project. 90 per cent of galaxies have z ≤ 3 and are observed in rest-frame optical wavelen…
The MOSDEF Survey: AGN Multi-wavelength Identification, Selection Biases, and Host Galaxy Properties
Siana, Brian; Azadi, Mojegan; Aird, James +10 more
We present results from the MOSFIRE Deep Evolution Field (MOSDEF) survey on the identification, selection biases, and host galaxy properties of 55 X-ray, IR, and optically selected active galactic nuclei (AGNs) at 1.4< z< 3.8. We obtain rest-frame optical spectra of galaxies and AGNs and use the BPT diagram to identify optical AGNs. We exami…
SPIRITS: Uncovering Unusual Infrared Transients with Spitzer
Van Dyk, Schuyler D.; Tinyanont, Samaporn; Smith, Nathan +44 more
We present an ongoing, five-year systematic search for extragalactic infrared transients, dubbed SPIRITS—SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer/IRAC, we searched 190 nearby galaxies with cadence baselines of one month and six months. We discovered over 1958 variables and 43 transients. Here, we describe the …
Mapping substructure in the HST Frontier Fields cluster lenses and in cosmological simulations
Richard, Johan; Vogelsberger, Mark; Pillepich, Annalisa +14 more
We map the lensing-inferred substructure in the first three clusters observed by the Hubble Space Telescope Frontier Fields (HSTFF) Initiative: Abell 2744 (z = 0.308), MACSJ 0416, (z = 0.396) and MACSJ 1149 (z = 0.543). Statistically resolving dark matter subhaloes down to ∼10^{9.5} M_{⊙}, we compare the derived subhalo mass functions (SHMFs) to t…
VLBI-Gaia offsets favor parsec-scale jet direction in active galactic nuclei
Petrov, L.; Kovalev, Y. Y.; Plavin, A. V.
Context. The data release 1 (DR1) of milliarcsecond-scale accurate optical positions of stars and galaxies was recently published by the space mission Gaia.
Aims: We study the offsets of highly accurate absolute radio (very long baseline interferometry, VLBI) and optical positions of active galactic nuclei (AGN) to see whether or not a signat…
Living on a Flare: Relativistic Reflection in V404 Cyg Observed by NuSTAR during Its Summer 2015 Outburst
Harrison, F. A.; Stern, D.; Fabian, A. C. +19 more
We present first results from a series of NuSTAR observations of the black hole X-ray binary V404 Cyg obtained during its summer 2015 outburst, primarily focusing on observations during the height of this outburst activity. The NuSTAR data show extreme variability in both the flux and spectral properties of the source. This is partly driven by str…