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New Detections of Radio Minihalos in Cool Cores of Galaxy Clusters
Clarke, Tracy E.; Mazzotta, Pasquale; Giacintucci, Simona +3 more
Cool cores of some galaxy clusters exhibit faint radio "minihalos." Their origin is unclear, and their study has been limited by their small number. We undertook a systematic search for minihalos in a large sample of X-ray luminous clusters with high-quality radio data. In this article, we report four new minihalos (A 478, ZwCl 3146, RXJ 1532.9+30…
The dust budget crisis in high-redshift submillimetre galaxies
Aragón-Salamanca, A.; Dunne, L.; Dye, S. +5 more
We apply a chemical evolution model to investigate the sources and evolution of dust in a sample of 26 high-redshift (z > 1) submillimetre galaxies (SMGs) from the literature, with complete photometry from ultraviolet to the submillimetre. We show that dust produced only by low-intermediate-mass stars falls a factor 240 short of the observed du…
On the origin of near-infrared extragalactic background light anisotropy
Gong, Yan; Cooray, Asantha; Matsuura, Shuji +13 more
Extragalactic background light (EBL) anisotropy traces variations in the total production of photons over cosmic history and may contain faint, extended components missed in galaxy point-source surveys. Infrared EBL fluctuations have been attributed to primordial galaxies and black holes at the epoch of reionization (EOR) or, alternately, intrahal…
HerMES: Candidate High-redshift Galaxies Discovered with Herschel/SPIRE
Aussel, H.; Pérez-Fournon, I.; Valtchanov, I. +63 more
We present a method for selecting z > 4 dusty, star-forming galaxies (DSFGs) using Herschel/Spectral and Photometric Imaging Receiver 250/350/500 µm flux densities to search for red sources. We apply this method to 21 deg2 of data from the HerMES survey to produce a catalog of 38 high-z candidates. Follow-up of the first five o…
Verifying the mass-metallicity relation in damped Lyman α selected galaxies at 0.1 < z < 3.2
Fynbo, J. P. U.; Christensen, L.; Møller, P. +1 more
A scaling relation has recently been suggested to combine the galaxy mass-metallicity (MZ) relation with metallicities of damped Lyman α systems (DLAs) in quasar spectra. Based on this relation the stellar masses of the absorbing galaxies can be predicted. We test this prediction by measuring the stellar masses of 12 galaxies in confirmed DLA abso…
A Map of Dust Reddening to 4.5 kpc from Pan-STARRS1
Price, P. A.; Rix, H. -W.; Chambers, K. C. +17 more
We present a map of the dust reddening to 4.5 kpc derived from Pan-STARRS1 stellar photometry. The map covers almost the entire sky north of declination -30° at a resolution of 7'-14', and is based on the estimated distances and reddenings to more than 500 million stars. The technique is designed to map dust in the Galactic plane, where many other…
Early 56Ni decay gamma rays from SN2014J suggest an unusual explosion
Diehl, Roland; Grebenev, Sergei A.; Greiner, Jochen +7 more
Type Ia supernovae result from binary systems that include a carbon-oxygen white dwarf, and these thermonuclear explosions typically produce 0.5 solar mass of radioactive 56Ni. The 56Ni is commonly believed to be buried deeply in the expanding supernova cloud. In SN2014J, we detected the lines at 158 and 812 kiloelectron volt…
The molecular gas reservoir of 6 low-metallicity galaxies from the Herschel Dwarf Galaxy Survey. A ground-based follow-up survey of CO(1-0), CO(2-1), and CO(3-2)
Lebouteiller, V.; Madden, S. C.; Galliano, F. +14 more
Context. Observations of nearby starburst and spiral galaxies have revealed that molecular gas is the driver of star formation. However, some nearby low-metallicity dwarf galaxies are actively forming stars, but CO, the most common tracer of this reservoir, is faint, leaving us with a puzzle about how star formation proceeds in these environments.…
Isochrones for Old (>5 Gyr) Stars and Stellar Populations. I. Models for -2.4 <= [Fe/H] <=+0.6, 0.25 <= Y <= 0.33, and -0.4 <= [α/Fe] <=+0.4
Edvardsson, Bengt; VandenBerg, Don A.; Ferguson, Jason W. +1 more
Canonical grids of stellar evolutionary sequences have been computed for the helium mass-fraction abundances Y = 0.25, 0.29, and 0.33, and for iron abundances that vary from -2.4 to +0.4 (in 0.2 dex increments) when [α/Fe] =+0.4, or for the ranges -2.0 <= [Fe/H] <=+0.6, -1.8 <= [Fe/H] <=+0.6 when [α/Fe] =0.0 and -0.4, respectively. The…
NuSTAR Discovery of a Luminosity Dependent Cyclotron Line Energy in Vela X-1
Hailey, Charles J.; Fürst, Felix; Pottschmidt, Katja +13 more
We present NuSTAR observations of Vela X-1, a persistent, yet highly variable, neutron star high-mass X-ray binary (HMXB). Two observations were taken at similar orbital phases but separated by nearly a year. They show very different 3-79 keV flux levels as well as strong variability during each observation, covering almost one order of magnitude …