THE X-RAY PROPERTIES OF THE OPTICALLY BRIGHTEST MINI-BAL QUASARS FROM THE SLOAN DIGITAL SKY SURVEY
- Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802 (United States)
- Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States)
- Department of Physics, University of North Texas, Denton, TX 76203 (United States)
We have compiled a sample of 14 of the optically brightest radio-quiet quasars (m{sub i} {<=} 17.5 and z {>=} 1.9) in the Sloan Digital Sky Survey Data Release 5 quasar catalog that have C IV mini-broad absorption lines (mini-BALs) present in their spectra. X-ray data for 12 of the objects were obtained via a Chandra snapshot survey using ACIS-S, while data for the other two quasars were obtained from archival XMM-Newton observations. Joint X-ray spectral analysis shows that the mini-BAL quasars have a similar average power-law photon index ({Gamma} {approx} 1.9) and level of intrinsic absorption (N{sub H} {approx}< 8 x 10{sup 21} cm{sup -2}) as non-BMB (neither BAL nor mini-BAL) quasars. Mini-BAL quasars are more similar to non-BMB quasars than to BAL quasars in their distribution of relative X-ray brightness (assessed with {Delta}{alpha}{sub ox}). Relative colors indicate mild dust reddening in the optical spectra of mini-BAL quasars. Significant correlations between {Delta}{alpha}{sub ox} and UV absorption properties are confirmed for a sample of 56 sources combining mini-BAL and BAL quasars with high signal-to-noise ratio rest-frame UV spectra, which generally supports models in which X-ray absorption is important in enabling driving of the UV absorption-line wind. We also propose alternative parameterizations of the UV absorption properties of mini-BAL and BAL quasars, which may better describe the broad absorption troughs in some respects.
- OSTI ID:
- 21471164
- Journal Information:
- Astrophysical Journal, Vol. 724, Issue 1; Other Information: DOI: 10.1088/0004-637X/724/1/762; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COSMOLOGY AND ASTRONOMY
ABSORPTION
BRIGHTNESS
DUSTS
GALAXY NUCLEI
QUASARS
SIGNAL-TO-NOISE RATIO
ULTRAVIOLET SPECTRA
X RADIATION
X-RAY GALAXIES
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
DIMENSIONLESS NUMBERS
ELECTROMAGNETIC RADIATION
GALAXIES
IONIZING RADIATIONS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SORPTION
SPECTRA