Search Publications
HST WFC3/IR Observations of Active Galactic Nucleus Host Galaxies at z ~ 2: Supermassive Black Holes Grow in Disk Galaxies
Schawinski, Kevin; Urry, C. Megan; Treister, Ezequiel +3 more
We present the rest-frame optical morphologies of active galactic nucleus (AGN) host galaxies at 1.5 < z < 3, using near-infrared imaging from the Hubble Space Telescope Wide Field Camera 3, the first such study of AGN host galaxies at these redshifts. The AGNs are X-ray-selected from the Chandra Deep Field South and have typical luminositie…
A Complete Sample of Ultraluminous X-ray Source Host Galaxies
Soria, Roberto; Tennant, Allyn F.; Swartz, Douglas A. +1 more
One hundred seven ultraluminous X-ray sources (ULXs) with 0.3-10.0 keV luminosities in excess of 1039 erg s-1 are identified in a complete sample of 127 nearby galaxies. The sample includes all galaxies within 14.5 Mpc above the completeness limits of both the Uppsala Galaxy Catalogue and the Infrared Astronomical Satellite s…
Exploring the Low-mass End of the M BH-σ* Relation with Active Galaxies
Ho, Luis C.; Barth, Aaron J.; Greene, Jenny E. +4 more
We present new measurements of stellar velocity dispersions, using spectra obtained with the Keck Echellette Spectrograph and Imager (ESI) and the Magellan Echellette (MagE), for 76 Seyfert 1 galaxies from the recent catalog of Greene & Ho. These objects were selected from the Sloan Digital Sky Survey (SDSS) to have estimated black hole (BH) m…
Rapid and Extensive Surface Changes Near Titan’s Equator: Evidence of April Showers
Barnes, J. W.; Lorenz, R. D.; West, R. A. +11 more
Although there is evidence that liquids have flowed on the surface at Titan’s equator in the past, to date, liquids have only been confirmed on the surface at polar latitudes, and the vast expanses of dunes that dominate Titan’s equatorial regions require a predominantly arid climate. We report the detection by Cassini’s Imaging Science Subsystem …
Dynamical masses of early-type galaxies: a comparison to lensing results and implications for the stellar initial mass function and the distribution of dark matter
Saglia, R. P.; Thomas, D.; Thomas, J. +6 more
This work aims to study the distribution of the luminous and dark matter in Coma early-type galaxies. Dynamical masses obtained under the assumption that mass follows light do not match with the masses of strong gravitational lens systems of similar velocity dispersions. Instead, dynamical fits with dark matter haloes are in good agreement with le…
Planck early results. XXIII. The first all-sky survey of Galactic cold clumps
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +202 more
We present the statistical properties of the Cold Clump Catalogue of Planck Objects (C3PO), the first all-sky catalogue of cold objects, in terms of their spatial distribution, dust temperature, distance, mass, and morphology. We have combined Planck and IRAS data to extract 10342 cold sources that stand out against a warmer environment. The sourc…
The HETDEX Pilot Survey. II. The Evolution of the Lyα Escape Fraction from the Ultraviolet Slope and Luminosity Function of 1.9 < z < 3.8 LAEs
Finkelstein, Steven L.; Schneider, Donald P.; Roth, Martin M. +18 more
We study the escape of Lyα photons from Lyα emitting galaxies (LAEs) and the overall galaxy population using a sample of 99 LAEs at 1.9 < z < 3.8 detected through integral-field spectroscopy of blank fields by The Hobby Eberly Telescope Dark Energy Experiment Pilot Survey. For 89 LAEs with broadband counterparts we measure ultraviolet (UV) l…
Families of dynamically hot stellar systems over 10 orders of magnitude in mass
Hilker, M.; Misgeld, I.
Dynamically hot stellar systems, whether star clusters or early-type galaxies, follow well-defined scaling relations over many orders of magnitudes in mass. These Fundamental Plane relations have been subject of several studies, which have been mostly confined to certain types of galaxies and/or star clusters so far. Here, we present a complete pi…
The Distribution of Thermal Pressures in the Diffuse, Cold Neutral Medium of Our Galaxy. II. An Expanded Survey of Interstellar C I Fine-structure Excitations
Tripp, Todd M.; Jenkins, Edward B.
We analyzed absorption features arising from interstellar neutral carbon that appeared in the UV spectra of 89 stars recorded in the highest resolution echelle modes of the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope so that we could determine the relative populations of collisionally excited fine-structure levels in t…
The dependence of star formation activity on environment and stellar mass at z∼ 1 from the HiZELS-Hα survey
Smail, Ian; Sobral, David; Geach, James E. +4 more
This paper presents an environment and stellar mass study of a large sample of star-forming Hα emitters at z= 0.84 from the High-z Emission Line Survey (HiZELS), over 1.3 deg2 split over two fields (COSMOS and UKIDSS UDS). By taking advantage of a truly panoramic coverage of a wide range of environments, from the field to a rich cluster…