The variable X-ray absorption and soft X-ray excess of the QSO MR2251 - 178

Details The variable X-ray absorption and soft X-ray excess of the QSO MR2251 - 178 The variable X-ray absorption and soft X-ray excess of the QSO MR2251 - 178

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..177p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 15, 1990, p. 177-187.

Astronomy and Astrophysics

Astronomy

63

Absorption Spectra, Quasars, Spectral Energy Distribution, X Ray Spectra, Active Galactic Nuclei, Exosat Satellite, H Ii Regions, Luminosity

Scientific paper

QSO MR2251 - 178, the subject of 15 Exosat observations, was found to undergo a factor-of-2 X-ray flux variation from October 1983 to December 1984; the pattern of variability is noted to be such that it cannot be described by simple intensity, absorption, or slope variations. It is presently found possible to account for all observed features through the adoption of the 'warm' absorber model, in which the absorbing material is partially ionized by the flux of extreme UV and X-ray photons from the central continuum source; the opacity profile of the absorbing material is then a function of source luminosity. The observed correlation of opacity with source luminosity is reproducible through the use of a photoionization code.

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