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The Sloan Digital Sky Survey Quasar Catalog. IV. Fifth Data Release
Castander, Francisco J.; Brandt, W. N.; Shen, Yue +41 more
We present the fourth edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog contains 77,429 objects; this is an increase of over 30,000 entries since the previous edition. The catalog consists of the objects in the SDSS Fifth Data Release that have luminosities larger than Mi=-22.0 (in a cosmology with H0…
Optical Spectroscopy and X-Ray Detections of a Sample of Quasars and Active Galactic Nuclei Selected in the Mid-Infrared from Two Spitzer Space Telescope Wide-Area Surveys
Armus, L.; Canalizo, G.; Sajina, A. +5 more
We present optical spectroscopy of a sample of 77 luminous active galactic nuclei (AGNs) and quasars selected on the basis of their mid-infrared colors. Our objects are selected from the Spitzer Extragalactic First Look Survey and the SWIRE XMM-Newton Large-Scale Structure Survey (XMM-LSS) fields, with a typical 24 µm flux density of 5 mJy. …
XMM-Newton and Chandra Spectroscopy of the Variable High-Energy Absorption of PG 1115+080: Refined Outflow Constraints
Brandt, W. N.; Chartas, G.; Gallagher, S. C. +1 more
We present results from multi-epoch spectral analysis of XMM-Newton and Chandra observations of the mini-broad absorption line (BAL) quasar PG 1115+080. This is one of the few X-ray-detected mini-BAL quasars to date that is bright enough in the X-ray band, mostly due to large gravitational-lensing magnifications, to allow in-depth spectral analysi…
X-Ray Observations of the Young Cluster NGC 2264
Simon, Theodore; Patten, B. M.; Dahm, S. E. +1 more
We present results from an X-ray imaging survey of the young cluster NGC 2264, carried out with the European Photon Imaging Cameras (EPIC) on board the XMM-Newton spacecraft. The X-ray data are merged with extant optical and near-infrared photometry, spectral classifications, Hα emission strengths, and rotation periods to examine the interrelation…
Supernova Remnants in the Magellanic Clouds. IX. Multiwavelength Analysis of the Physical Structure of N49
Gruendl, R. A.; Chu, Y. -H.; Bilikova, J. +2 more
We present a multiwavelength analysis of the supernova remnant N49 in the Large Magellanic Cloud. Using high-resolution Hubble Space Telescope WFPC2 images of Hα, [S II], and [O III] emission, we study the morphology of the remnant and calculate the rms electron densities in different regions. We detect an offset of [O III] and Hα emission peaks o…
Star Formation, Radio Sources, Cooling X-Ray Gas, and Galaxy Interactions in the Brightest Cluster Galaxy in 2A0335+096
O'Dea, Christopher P.; Donahue, Megan; Voit, G. Mark +2 more
We present deep emission-line imaging taken with the new SOAR Optical Imager of the brightest cluster galaxy (BCG) in the nearby (z=0.035) X-ray cluster of galaxies 2A0335+096. We also present our analysis of additional, multiwavelength observations for the BCG, including long-slit optical spectroscopy, archival VLA radio data, Chandra X-ray imagi…
XMM-Newton Observations of the Cataclysmic Variable GW Librae
Hellier, Coel; Szkody, Paula; Mukai, Koji +4 more
XMM-Newton observations of the accreting, pulsating white dwarf in the quiescent dwarf nova GW Librae were conducted to determine whether the nonradial pulsations present in previous UV and optical data affect the X-ray emission. The nonradial pulsations are evident in the simultaneous Optical Monitor data but are not detected in the X-ray with an…
X-Ray Properties of the Quasar HE 0450-2958
Zhou, Xin-Lin; Wang, Jian-Min; Yang, Fang +1 more
We present an XMM-Newton EPIC observation of HE 0450-2958, which may be a ``naked'' quasar as suggested by Magain and coworkers. The XMM-Newton EPIC spectra show a substantial soft X-ray excess and a steep photon index, as well as marginal evidence for a weak Fe Kα line. The X-ray absorption is consistent with the Galactic level. The 0.3-10 keV EP…
Small-Scale Systems of Galaxies. III. X-Ray-detected Elliptical+Spiral Galaxy Pairs in Low-Density Environments
Held, E. V.; Rizzi, L.; Trinchieri, G. +4 more
We present a comprehensive study of the local environments of four elliptical+spiral (E+S) galaxy pairs with the main goal of investigating their formation/evolution histories. We obtained new XMM-Newton data for two pairs (RR 143 and RR 242) that complement existing ROSAT data for the other two (RR 210 and RR 216). The new observations reveal dif…
A Silver Anniversary Observation of the X-Ray-Luminous SN 1978K in NGC 1313
Schlegel, E. M.; Lenz, E.
We describe the results of a 2003 Chandra ACIS-I observation of SN 1978K. The spectrum shows little flux below 0.6 keV, in contrast to the 2002 Chandra ACIS-S observation, which showed flux to 0.4 keV. Fitting the ACIS-I spectrum alone leads to two solutions depending on the value of the column density. A joint fit using a dual thermal plasma mode…