Search Publications
A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies. I. Galaxy Mergers and Quasar Activity
Hernquist, Lars; Cox, Thomas J.; Hopkins, Philip F. +1 more
We develop a model for the cosmological role of mergers in the evolution of starbursts, quasars, and spheroidal galaxies. By combining theoretically well-constrained halo and subhalo mass functions as a function of redshift and environment with empirical halo occupation models, we can estimate where galaxies of given properties live at a particula…
The Chandra Deep Field-South Survey: 2 Ms Source Catalogs
Smail, I.; Finoguenov, A.; Lehmer, B. D. +19 more
We present point-source catalogs for the ≈2 Ms exposure of the Chandra Deep Field-South (CDF-S); this is one of the two most sensitive X-ray surveys ever performed. The survey covers an area of ≈436 arcmin2 and reaches on-axis sensitivity limits of ≈1.9 × 10-17 and ≈1.3 × 10-16 ergs cm-2 s-1 f…
A High-Resolution Survey of Low-Redshift QSO Absorption Lines: Statistics and Physical Conditions of O VI Absorbers
Richter, Philipp; Bowen, David V.; Tripp, Todd M. +4 more
Using high-resolution ultraviolet spectra of 16 low-z QSOs obtained with the E140M echelle mode of the Space Telescope Imaging Spectrograph, we study the physical conditions and statistics of O VI absorption in the intergalactic medium (IGM) at z < 0.5. We identify 51 intervening (zabsll zQSO) O VI systems comprising 77 in…
A Compendium of Far-Infrared Line and Continuum Emission for 227 Galaxies Observed by the Infrared Space Observatory
Dale, Daniel A.; Helou, George; Brauher, James R.
Far-infrared line and continuum fluxes are presented for a sample of 227 galaxies observed with the Long Wavelength Spectrometer on the Infrared Space Observatory. The galaxy sample includes normal star-forming systems, starbursts, and active galactic nuclei covering a wide range of colors and morphologies. The data set spans some 1300 line fluxes…
The Subaru/XMM-Newton Deep Survey (SXDS). III. X-Ray Data
Simpson, Chris; Ueda, Yoshihiro; Carrera, Francisco J. +10 more
We present the X-ray source catalog in the Subaru/XMM-Newton deep survey. A continuous area of 1.14 deg2 centered at R .A . = 02h18m and decl . = - 05° is mapped by seven pointings with XMM-Newton covering the 0.2-10 keV band. From the combined images of the EPIC pn and MOS cameras, we detect 866, 1114, 645, and 13…
A New Method to Separate Star-forming from AGN Galaxies at Intermediate Redshift: The Submillijansky Radio Population in the VLA-COSMOS Survey
Bondi, M.; Aussel, H.; Sanders, D. B. +21 more
We explore the properties of the submillijansky radio population at 20 cm by applying a newly developed optical color-based method to separate star-forming (SF) from active galactic nucleus (AGN) galaxies at intermediate redshifts (zlesssim 1.3). Although optical rest-frame colors are used, our separation method is shown to be efficient and not bi…
Wavelengths and Intensities of Spectral Lines in the 171-211 and 245-291 Å Ranges from Five Solar Regions Recorded by the Extreme-Ultraviolet Imaging Spectrometer (EIS) on Hinode
Brown, C. M.; Hara, H.; Feldman, U. +2 more
We present spectral line wavelengths, identifications, and intensities in the 171-211 and 245-291 Å ranges from five solar plasma regions recorded by the Extreme-Ultraviolet Imaging Spectrometer (EIS) on Hinode. The recorded data were emitted from a quiet region, two active areas on the solar disk, a limb region, and a region 20'' above the limb. …
First Catalog of Strong Lens Candidates in the COSMOS Field
Refregier, Alexandre; Ellis, Richard; Schinnerer, Eva +19 more
We present the first catalog of 67 strong galaxy-galaxy lens candidates discovered in the 1.64 deg2 Hubble Space Telescope COSMOS survey. Twenty of these systems display multiple images or strongly curved large arcs. Our initial search is performed by visual inspection of the data and is restricted, for practical considerations, to mass…
The Far Ultraviolet Spectroscopic Explorer Survey of O VI Absorption in the Disk of the Milky Way
Bowen, David V.; Tripp, Todd M.; Jenkins, Edward B. +12 more
To probe the distribution and physical characteristics of interstellar gas at temperatures T ≈ 3 × 105 K in the disk of the Milky Way, we have used the Far Ultraviolet Spectroscopic Explorer (FUSE) to observe absorption lines of O VI λ1032 toward 148 early-type stars situated at distances >1 kpc. After subtracting off a mild excess o…
Spitzer IRS Spectra and Envelope Models of Class I Protostars in Taurus
Watson, D. M.; Furlan, E.; Sargent, B. +8 more
We present Spitzer Infrared Spectrograph (IRS) spectra of 28 Class I protostars in the Taurus star-forming region. The 5-36 µm spectra reveal excess emission from the inner regions of the envelope and accretion disk surrounding these predecessors of low-mass stars, as well as absorption features due to silicates and ices. Together with short…