Search Publications
A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
Brandt, W. N.; Shen, Yue; Hall, Patrick B. +9 more
We present a catalog of 5039 broad absorption line (BAL) quasars (QSOs) in the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) QSO catalog that have absorption troughs covering a continuous velocity range >=2000 km s-1. We have fitted ultraviolet (UV) continua and line emission in each case, enabling us to report common diagnost…
Supernova Feedback Efficiency and Mass Loading in the Starburst and Galactic Superwind Exemplar M82
Heckman, Timothy M.; Strickland, David K.
We measure the net energy efficiency of supernova (SN) and stellar wind feedback in the starburst galaxy M82 and the degree of mass loading of the hot gas piston driving its superwind by comparing a large suite of one and two-dimensional hydrodynamical models to a set of observational constraints derived from hard X-ray observations of the starbur…
Photometric Redshift and Classification for the XMM-COSMOS Sources
Aussel, H.; Le Floc'h, E.; Sanders, D. B. +40 more
We present photometric redshifts and spectral energy distribution (SED) classifications for a sample of 1542 optically identified sources detected with XMM in the COSMOS field. Our template fitting classifies 46 sources as stars and 464 as nonactive galaxies, while the remaining 1032 require templates with an active galactic nucleus (AGN) contribu…
Radio-Loud Narrow-Line Seyfert 1 as a New Class of Gamma-Ray Active Galactic Nuclei
Maraschi, L.; Caraveo, P. A.; Tagliaferri, G. +147 more
We report the discovery with Fermi/LAT of γ-ray emission from three radio-loud narrow-line Seyfert 1 galaxies: PKS 1502+036 (z = 0.409), 1H 0323+342 (z = 0.061), and PKS 2004 - 447 (z = 0.24). In addition to PMN J0948+0022 (z = 0.585), the first source of this type to be detected in γ rays, they may form an emerging new class of γ-ray active galac…
Stellar-Mass Black Hole Spin Constraints from Disk Reflection and Continuum Modeling
Fabian, A. C.; Miller, J. M.; Reynolds, C. S. +2 more
Accretion disk reflection spectra, including broad iron emission lines, bear the imprints of the strong Doppler shifts and gravitational redshifts close to black holes. The extremity of these shifts depends on the proximity of the innermost stable circular orbit to the black hole, and that orbit is determined by the black hole spin parameter. Mode…
GRB 080913 at Redshift 6.7
Greiner, J.; McBreen, S.; Hartmann, D. H. +44 more
We report on the detection by Swift of GRB 080913, and subsequent optical/near-infrared follow-up observations by GROND, which led to the discovery of its optical/NIR afterglow and the recognition of its high-z nature via the detection of a spectral break between the i' and z' bands. Spectroscopy obtained at the ESO-VLT revealed a continuum extend…
The Infrared Nuclear Emission of Seyfert Galaxies on Parsec Scales: Testing the Clumpy Torus Models
Telesco, C. M.; Fisher, R. S.; Packham, C. +6 more
We present subarcsecond resolution mid-infrared (mid-IR) photometry in the wavelength range from 8 to 20 µm of 18 Seyfert galaxies, reporting high spatial resolution nuclear fluxes for the entire sample. We construct spectral energy distributions (SEDs) that the active galactic nucleus (AGN) dominates, relatively uncontaminated by starlight,…
Evidence for X-Ray Synchrotron Emission from Simultaneous Mid-Infrared to X-Ray Observations of a Strong Sgr A* Flare
Genzel, R.; Rouan, D.; Pantin, E. +22 more
This paper reports measurements of Sgr A* made with NACO in L' band (3.80 µm), Ks band (2.12 µm), and H band (1.66 µm), and with VISIR in N band (11.88 µm) at the ESO VLT, as well as with XMM-Newton at X-ray (2-10 keV) wavelengths. On 2007 April 4, a very bright flare was observed from Sgr A* simultaneously at L' band and X…
A Compton-thick Wind in the High-luminosity Quasar, PDS 456
Behar, E.; Turner, T. J.; Fabian, A. C. +7 more
PDS 456 is a nearby (z = 0.184), luminous (L bol ~ 1047 erg s-1) type I quasar. A deep 190 ks Suzaku observation in 2007 February revealed the complex, broadband X-ray spectrum of PDS 456. The Suzaku spectrum exhibits highly statistically significant absorption features near 9 keV in the quasar rest frame. We show …
Every BCG with a Strong Radio Agn has an X-Ray Cool Core: Is the Cool Core-Noncool Core Dichotomy Too Simple?
Sun, M.
The radio active galactic nucleus (AGN) feedback in X-ray cool cores has been proposed as a crucial ingredient in the evolution of baryonic structures. However, it has long been known that strong radio AGNs also exist in "noncool core" clusters, which brings up the question whether an X-ray cool core is always required for the radio feedback. In t…