Search Publications
Chasing the Identification of ASCA Galactic Objects (ChIcAGO): An X-Ray Survey of Unidentified Sources in the Galactic Plane. I. Source Sample and Initial Results
Drake, Jeremy J.; Chakrabarty, Deepto; Lee, Julia C. +18 more
We present the Chasing the Identification of ASCA Galactic Objects (ChIcAGO) survey, which is designed to identify the unknown X-ray sources discovered during the ASCA Galactic Plane Survey (AGPS). Little is known about most of the AGPS sources, especially those that emit primarily in hard X-rays (2-10 keV) within the Fx ~ 10-13
K-shell Photoabsorption of Magnesium Ions
García, J.; Kallman, T. R.; Gatuzz, E. +4 more
X-ray photoabsorption cross sections have been computed for all magnesium ions with three or more electrons using the R-matrix method. A comparison with other available data for Mg II-Mg X shows good qualitative agreement in the resultant resonance shapes. However, for the lower ionization stages, and for singly ionized Mg II in particular, the pr…
Infrared Spectra of Acetylene Diluted in Solid Nitrogen upon Irradiation with Vacuum Ultraviolet Light and Electrons
Chen, Sian-Cong; Huang, Tzu-Ping; Wu, Yu-Jong +1 more
Infrared spectra and chemical reactions of acetylene diluted in solid nitrogen at 10 K upon irradiation with vacuum ultraviolet (VUV) light and energetic electrons were investigated in separate experiments. Irradiation of the matrix sample with VUV light peaking at 160 and 121.6 nm yielded simple products, including C2H, CN, and isomers…
Herschel and Spitzer Observations of Slowly Rotating, Nearby Isolated Neutron Stars
Pavlov, G. G.; Wachter, S.; Posselt, B. +1 more
Supernova fallback disks around neutron stars have been suspected to influence the evolution of the diverse neutron star populations. Slowly rotating neutron stars are the most promising places to find such disks. Searching for the cold and warm debris of old fallback disks, we carried out Herschel PACS (70 µm, 160 µm) and Spitzer IRAC…
A Photon-dominated Region Model for the FIR Mid-J CO Ladder with Universal Rotational Temperature in Star Forming Regions
Lee, Jeong-Eun; Bergin, Edwin A.; Lee, Seokho +1 more
A photon-dominated region (PDR) is one of the leading candidate mechanisms for the origin of warm CO gas with near universal ~300 K rotational temperature inferred from the CO emission detected toward embedded protostars by Herschel/PACS. We have developed a PDR model in general coordinates, where we can use the most adequate coordinate system for…
Observed Relationship between CO 2-1 and Dust Emission during the Post-asymptotic-giant-branch Phase
Szczerba, R.; He, J. H.; Schmidt, M. R. +1 more
A CO 2-1 line survey is performed toward a sample of 58 high Galactic latitude post-asymptotic-giant-branch (pAGB) stars. To complement the observations, a compilation of literature CO 2-1 line data of known pAGB stars is done. After combining the data sets, CO 2-1 line data are available for 133 pAGB stars (about 34% of known pAGB stars) among wh…
An Atlas of Far-ultraviolet Spectra of the Zeta Aurigae Binary 31 Cygni with Line Identifications
Bennett, Philip D.; Hagen Bauer, Wendy
The ζ Aurigae system 31 Cygni (K4 Ib + B4 V) was observed by the FUSE satellite during total eclipse and at three phases during chromospheric eclipse. We present the coadded, calibrated spectra and atlases with line identifications. During total eclipse, emission from high ionization states (e.g., Fe III and Cr III) shows asymmetric profiles redsh…
The ACS Survey of Globular Clusters. XIII. Photometric Calibration in Comparison with Stetson Standards
Anderson, Jay; Majewski, Steven R.; Sarajedini, Ata +11 more
In this study we compare the photometric data of 34 Milky Way globular clusters, observed within the Advanced Camera for Surveys (ACS) Treasury Program (PI: A. Sarajedini) with the corresponding ground-based data, provided by the Photometric Standard Field Catalogs of Stetson. We focus on the transformation between the Hubble Space Telescope/ACS F…
A Deep Chandra Observation of the Giant H II Region N11. I. X-Ray Sources in the Field
Nazé, Yaël; Chu, You-Hua; Wang, Q. Daniel +2 more
A very sensitive X-ray investigation of the giant H II region N11 in the Large Megallanic Cloud was performed using the Chandra X-ray Observatory. The 300 ks observation reveals X-ray sources with luminosities down to 1032 erg s-1, increasing the number of known point sources in the field by more than a factor of five. Among …
The Second Fermi Large Area Telescope Catalog of Gamma-Ray Pulsars
Troja, E.; Caraveo, P. A.; Orlando, E. +208 more
This catalog summarizes 117 high-confidence >=0.1 GeV gamma-ray pulsar detections using three years of data acquired by the Large Area Telescope (LAT) on the Fermi satellite. Half are neutron stars discovered using LAT data through periodicity searches in gamma-ray and radio data around LAT unassociated source positions. The 117 pulsars are eve…