Search Publications
The Sub-mJy Radio Population of the E-CDFS: Optical and Infrared Counterpart Identification
Brandt, W. N.; Tozzi, P.; Balestra, I. +9 more
We study a sample of 883 sources detected in a deep Very Large Array survey at 1.4 GHz in the Extended Chandra Deep Field South. This paper focuses on the identification of their optical and infrared (IR) counterparts. We use a likelihood-ratio technique that is particularly useful when dealing with deep optical images to minimize the number of sp…
Mid-infrared Spectral Variability Atlas of Young Stellar Objects
Ábrahám, P.; Kóspál, Á.; Henning, Th. +6 more
Optical and near-infrared variability is a well-known property of young stellar objects. However, a growing number of recent studies claim that a considerable fraction of them also exhibit mid-infrared flux changes. With the aim of studying and interpreting variability on a decadal timescale, here we present a mid-infrared spectral atlas containin…
Molecular Environments of 51 Planck Cold Clumps in the Orion Complex
Liu, Tie; Wu, Yuefang; Zhang, Huawei
A mapping survey of 51 Planck cold clumps projected on the Orion complex was performed with J = 1-0 lines of 12CO and 13CO with the 13.7 m telescope at the Purple Mountain Observatory. The mean column densities of the Planck gas clumps range from 0.5 to 9.5 × 1021 cm-2, with an average value of (2.9 ± 1.…
Spitzer Search for Dust Disks around Central Stars of Planetary Nebulae
De Marco, Orsola; Chu, You-Hua; Bilíková, Jana +2 more
Two types of dust disks have been discovered around white dwarfs (WDs): small dust disks within the Roche limits of their WDs and large dust disks around hot WDs extending to radial distances of 10-102 AU. The majority of the latter WDs are central stars of planetary nebulae (CSPNs). We have therefore used archival Spitzer Infrared Arra…
OPACOS: OVRO Post-AGB CO (1-0) Emission Survey. I. Data and Derived Nebular Parameters
Sahai, R.; Sánchez Contreras, C.
We have performed interferometric observations of the 12CO (J = 1-0) emission in a sample of 27 objects spanning different evolutionary stages from the late asymptotic giant branch (late-AGB), through the post-AGB (pAGB) phase, and to the planetary nebula (PN) stage, but dominated by pAGB objects and young PNs (>=81%). In this paper …
The Optical and Ultraviolet Emission-line Properties of Bright Quasars with Detailed Spectral Energy Distributions
Gu, Qiusheng; Shang, Zhaohui; Brotherton, Michael S. +2 more
We present measurements and statistical properties of the optical and ultraviolet emission lines present in the spectra of 85 bright quasars which have detailed spectral energy distributions. This heterogeneous sample has redshifts up to z = 1.5 and is comprised of three subsamples that may be of particular utility: ultraviolet excess Palomar-Gree…
The Deep Look at the Hard X-Ray Sky: The Swift-INTEGRAL X-Ray (SIX) Survey
Greiner, Jochen; Ajello, Marco; Bottacini, Eugenio
The supermassive black holes at the center of active galactic nuclei (AGNs) are surrounded by obscuring matter that can block nuclear radiation. Depending on the amount of blocked radiation, the flux from the AGN can be too faint to be detected by currently flying hard X-ray (above 15 keV) missions. At these energies only ~1% of the intensity of t…
A Panchromatic Catalog of Early-type Galaxies at Intermediate Redshift in the Hubble Space Telescope Wide Field Camera 3 Early Release Science Field
Holtzman, J. A.; O'Connell, R. W.; Walker, A. R. +24 more
In the first of a series of forthcoming publications, we present a panchromatic catalog of 102 visually selected early-type galaxies (ETGs) from observations in the Early Release Science (ERS) program with the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) of the Great Observatories Origins Deep Survey-South (GOODS-S) field. Our ET…
Editorial: Interstellar Boundary Explorer (IBEX): Direct Sampling of the Interstellar Medium
McComas, D. J.
This special supplement issue of the Astrophysical Journal comprises six coordinated papers that provide the first detailed analyses of the direct sampling of interstellar neutral atoms by the Interstellar Boundary Explorer (IBEX). Interstellar atoms are the detritus of older stars—their stellar winds, novae, and supernovae—spread across the galax…
A Detailed Far-ultraviolet Spectral Atlas of O-type Stars
Smith, Myron A.
In this paper, we present a spectral atlas covering the wavelength interval 930-1188 Å for O2-O9.5 stars using Far-Ultraviolet Spectroscopic Explorer archival data. The stars selected for the atlas were drawn from three populations: Galactic main-sequence (classes III-V) stars, supergiants, and main-sequence stars in the Magellanic Clouds, which h…