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Title:
X-ray absorption by ionized oxygen in ASCA spectra of the infrared quasar IRAS 13349+2438
Authors:
Brandt, W. N.; Mathur, S.; Reynolds, C. S.; Elvis, M.
Affiliation:
AA(Pennsylvania State Univ., University Park), AB(Pennsylvania State Univ., University Park), AC(Colorado, Univ., Boulder), AD(Harvard-Smithsonian Center for Astrophysics)
Publication:
Royal Astronomical Society, Monthly Notices, vol. 292, p. 407 (MNRAS Homepage)
Publication Date:
12/1997
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
QUASARS, X RAY ABSORPTION, IONIZED GASES, OXYGEN SPECTRA, INFRARED ASTRONOMY SATELLITE, X RAY SOURCES, NEAR INFRARED RADIATION, ASTRONOMICAL POLARIMETRY, ROSAT MISSION, ULTRAVIOLET ABSORPTION, LINE SPECTRA
Bibliographic Code:
1997MNRAS.292..407B

Abstract

We present evidence for X-ray absorption by ionized oxygen in ASCA spectra of the prototype IR quasar IRAS 13349+2438. This powerful quasar was studied in detail with ROSAT, and the combination of the X-ray data and optical/NIR spectropolarimetry strongly suggested the presence of a dusty ionized ('warm') absorber along the line of sight to the central X-ray source. The ASCA spectra, in contrast to an earlier claim, show evidence for ionized oxygen edges, and the presence of such edges appears to provide the most physically plausible interpretation of the data. Thus, the ASCA spectra support the dusty warm absorber hypothesis. The ASCA data also allow the physical properties of the warm absorber to be constrained far better than before. Based on the ASCA fitting, we suggest that UV absorption lines from the warm absorber may be detectable, and discuss how they can be used to further constrain the warm absorber properties. We compare and contrast the X-ray properties of IRAS 13349+2438 with those of broad absorption line quasars.

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