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The Dependence of Quenching upon the Inner Structure of Galaxies at 0.5 <= z < 0.8 in the DEEP2/AEGIS Survey
Bell, Eric F.; Kocevski, Dale D.; Koekemoer, Anton M. +25 more
The shutdown of star formation in galaxies is generally termed "quenching." Quenching may occur through a variety of processes, e.g., active galactic nucleus (AGN) feedback, stellar feedback, or the shock heating of gas in the dark matter halo. However, which mechanism(s) is, in fact, responsible for quenching is still in question. This paper addr…
Two stellar-mass black holes in the globular cluster M22
Strader, Jay; Maccarone, Thomas J.; Seth, Anil C. +2 more
Hundreds of stellar-mass black holes probably form in a typical globular star cluster, with all but one predicted to be ejected through dynamical interactions. Some observational support for this idea is provided by the lack of X-ray-emitting binary stars comprising one black hole and one other star (`black-hole/X-ray binaries') in Milky Way globu…
Galaxy properties from the ultraviolet to the far-infrared: Λ cold dark matter models confront observations
Somerville, Rachel S.; Primack, Joel R.; Domínguez, Alberto +1 more
We combine a semi-analytic model of galaxy formation with simple analytic recipes describing the absorption and re-emission of starlight by dust in the interstellar medium of galaxies. We use the resulting models to predict galaxy counts and luminosity functions from the far-ultraviolet (FUV) to the submillimetre, from redshift five to the present…
Understanding Dual Active Galactic Nucleus Activation in the nearby Universe
Koss, Michael; Veilleux, Sylvain; Mushotzky, Richard +3 more
We study the fraction of dual active galactic nuclei (AGNs) in a sample of 167 nearby (z < 0.05), moderate-luminosity, ultra-hard X-ray-selected AGNs from the all-sky Swift Burst Alert Telescope (BAT) survey. Combining new Chandra and Gemini observations together with optical and X-ray observations, we find that the dual AGN frequency at scales…
Large-amplitude Variations of an L/T Transition Brown Dwarf: Multi-wavelength Observations of Patchy, High-contrast Cloud Features
Marley, Mark; Radigan, Jacqueline; Saumon, Didier +3 more
We present multiple-epoch photometric monitoring in the J, H, and Ks bands of the T1.5 dwarf 2MASS J21392676+0220226 (2M2139), revealing persistent, periodic (P = 7.721 ± 0.005 hr) variability with a peak-to-peak amplitude as high as 26% in the J band. The light curve shape varies on a timescale of days, suggesting that evolving atmosph…
Herschel Far-infrared and Submillimeter Photometry for the KINGFISH Sample of nearby Galaxies
Helou, G.; Roussel, H.; Murphy, E. J. +39 more
New far-infrared and submillimeter photometry from the Herschel Space Observatory is presented for 61 nearby galaxies from the Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel (KINGFISH) sample. The spatially integrated fluxes are largely consistent with expectations based on Spitzer far-infrared photometry and extrapolations t…
The Chandra COSMOS Survey. III. Optical and Infrared Identification of X-Ray Point Sources
Salvato, M.; Fiore, F.; Vignali, C. +29 more
The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra program that has imaged the central 0.9 deg2 of the COSMOS field down to limiting depths of 1.9 × 10-16 erg cm-2 s-1 in the soft (0.5-2 keV) band, 7.3 × 10-16 erg cm-2 s-1 in the hard (2-10 keV) band, and 5.…
CAIXA: a catalogue of AGN in the XMM-Newton archive. III. Excess variance analysis
Bianchi, S.; Ponti, G.; Guainazzi, M. +4 more
Context. We report on the results of the first XMM-Newton systematic "excess variance" study of all the radio quiet, X-ray un-obscured AGN. The entire sample consist of 161 sources observed by XMM-Newton for more than 10 ks in pointed observations, which is the largest sample used so far to study AGN X-ray variability on time scales less than a da…
The Tides of Titan
Stevenson, David J.; Iess, Luciano; Jacobson, Robert A. +7 more
We have detected in Cassini spacecraft data the signature of the periodic tidal stresses within Titan, driven by the eccentricity (e = 0.028) of its 16-day orbit around Saturn. Precise measurements of the acceleration of Cassini during six close flybys between 2006 and 2011 have revealed that Titan responds to the variable tidal field exerted by S…
A Radio-selected Sample of Gamma-Ray Burst Afterglows
Chandra, Poonam; Frail, Dale A.
We present a catalog of radio afterglow observations of gamma-ray bursts (GRBs) over a 14 year period from 1997 to 2011. Our sample of 304 afterglows consists of 2995 flux density measurements (including upper limits) at frequencies between 0.6 GHz and 660 GHz, with the majority of data taken at 8.5 GHz frequency band (1539 measurements). We use t…