Statistics – Computation
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330...91w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 1, 1988, p. 91-104. Research supported by the University of Calif
Statistics
Computation
8
Active Galactic Nuclei, Black Holes (Astronomy), Light Curve, Molecular Clouds, Seyfert Galaxies, X Ray Sources, Computational Astrophysics, Exosat Satellite, H Beta Line, Line Of Sight
Scientific paper
The intensity of soft X-rays (0.2 - 2 keV) emitted by some active galaxies is observed to vary on short time scales, from tens of minutes to days. In low-luminosity sources, these variations may be due in part to the motions of dense clouds in the broad-line region. The authors derive the autocovariance function of the uncovered area for a model of a circular source region and circular, Poisson-distributed, moving clouds with random directions and a given speed. Comparison of this model with soft X-ray light curves and measurements of the broad-line cloud covering fraction yields estimates of the sizes of the clouds and the source. Electron densities can also be calculated from observations of the flux of the broad component of Hβ, or of the total X-ray flux.
Filippenko Alexei V.
Strauss Michael A.
Wachter Kenneth W.
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