Search Publications
A Survey of Stellar Families: Multiplicity of Solar-type Stars
Gies, Douglas R.; Latham, David W.; Marcy, Geoffrey W. +6 more
We present the results of a comprehensive assessment of companions to solar-type stars. A sample of 454 stars, including the Sun, was selected from the Hipparcos catalog with π>40 mas, σπ/π < 0.05, 0.5 <= B - V <= 1.0 (~F6-K3), and constrained by absolute magnitude and color to exclude evolved stars. These criteria are equiv…
A Library of Theoretical Ultraviolet Spectra of Massive, Hot Stars for Evolutionary Synthesis
Pettini, Max; Leitherer, Claus; Bresolin, Fabio +5 more
We computed a comprehensive set of theoretical ultraviolet spectra of hot, massive stars with the radiation-hydrodynamics code WM-Basic. This model atmosphere and spectral synthesis code is optimized for computing the strong P Cygni type lines originating in the winds of hot stars, which are the strongest features in the ultraviolet spectral regio…
The Fourth IBIS/ISGRI Soft Gamma-ray Survey Catalog
Götz, D.; Hill, A. B.; Rodriguez, J. +19 more
In this paper, we report on the fourth soft gamma-ray source catalog obtained with the IBIS gamma-ray imager on board the INTEGRAL satellite. The scientific data set is based on more than 70 Ms of high-quality observations performed during the first five and a half years of the Core Program and public observations. Compared to previous IBIS survey…
The Taurus Spitzer Survey: New Candidate Taurus Members Selected Using Sensitive Mid-Infrared Photometry
Stapelfeldt, K. R.; Wolf, S.; Audard, M. +31 more
We report on the properties of pre-main-sequence objects in the Taurus molecular clouds as observed in seven mid- and far-infrared bands with the Spitzer Space Telescope. There are 215 previously identified members of the Taurus star-forming region in our ~44 deg2 map these members exhibit a range of Spitzer colors that we take to defin…
Identifications and Photometric Redshifts of the 2 Ms Chandra Deep Field-South Sources
Lehmer, B. D.; Alexander, D. M.; Silverman, J. D. +11 more
We present reliable multiwavelength identifications and high-quality photometric redshifts for the 462 X-ray sources in the ≈2 Ms Chandra Deep Field-South (CDF-S) survey. Source identifications are carried out using deep optical-to-radio multiwavelength catalogs, and are then combined to create lists of primary and secondary counterparts for the X…
The Extended Chandra Deep Field-South Survey: Optical Spectroscopy of Faint X-ray Sources with the VLT and Keck
Finoguenov, A.; Lehmer, B. D.; Alexander, D. M. +26 more
We present the results of a program to acquire high-quality optical spectra of X-ray sources detected in the Extended-Chandra Deep Field-South (E-CDF-S) and its central 2 Ms area. New spectroscopic redshifts, up to z = 4, are measured for 283 counterparts to Chandra sources with deep exposures (t ~ 2-9 hr per pointing) using multi-slit facilities …
The Atacama Cosmology Telescope (ACT): Beam Profiles and First SZ Cluster Maps
Ade, P. A. R.; Bond, J. R.; Hernández-Monteagudo, C. +69 more
The Atacama Cosmology Telescope (ACT) is currently observing the cosmic microwave background with arcminute resolution at 148 GHz, 218 GHz, and 277 GHz. In this paper, we present ACT's first results. Data have been analyzed using a maximum-likelihood map-making method which uses B-splines to model and remove the atmospheric signal. It has been use…
The VLA-COSMOS Perspective on the Infrared-Radio Relation. I. New Constraints on Selection Biases and the Non-Evolution of the Infrared/Radio Properties of Star-Forming and Active Galactic Nucleus Galaxies at Intermediate and High Redshift
Aussel, H.; Le Floc'h, E.; Sanders, D. B. +18 more
VLA 1.4 GHz (σ~ 0.012 mJy) and MIPS 24 and 70 µm (σ~ 0.02 and 1.7 mJy, respectively) observations covering the 2 deg2 COSMOS field are combined with an extensive multiwavelength data set to study the evolution of the infrared (IR)-radio relation at intermediate and high redshift. With ~4500 sources—of which ~30% have spectroscopic…
Ultradeep KS Imaging in the GOODS-N
Wang, Wei-Hao; Cowie, Lennox L.; Barger, Amy J. +2 more
We present an ultradeep KS -band image that covers 0.5 × 0.5 deg2 centered on the Great Observatories Origins Deep Survey-North (GOODS-N). The image reaches a 5σ depth of K_{S,AB}=24.45 in the GOODS-N region, which is as deep as the GOODS-N Spitzer Infrared Array Camera (IRAC) 3.6 µm image. We present a new method of co…
StarCAT: A Catalog of Space Telescope Imaging Spectrograph Ultraviolet Echelle Spectra of Stars
Ayres, Thomas R.
StarCAT is a catalog of high resolution ultraviolet spectra of objects classified as "stars," recorded by Space Telescope Imaging Spectrograph (STIS) during its initial seven years of operations (1997-2004). StarCAT is based on 3184 echelle observations of 545 distinct targets, with a total exposure duration of 5.2 Ms. For many of the objects, bro…