Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..660n&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Feb. 15, 1990, p. 660-668.
Astronomy and Astrophysics
Astronomy
57
Astronomical Spectroscopy, Seyfert Galaxies, Variability, X Ray Spectra, Astronomical Models, Data Reduction, Spaceborne Astronomy
Scientific paper
Ginga observations of the Seyfert I galaxy MCG-6-30-15 show rapid variability, consistent with that found by Exosat, and the greater sensitivity afforded by the larger detector area and low background of the LAC confirm and extend the spectral detail seen previously. In addition, time-resolved X-ray spectroscopy shows short time-scale variability of the continuum spectrum, primarily at low X-ray energies and in the sense that the softness increases with flux. The X-ray data may be explained by a model in which an accretion disk surrounds the central black hole in MCG-6-30-15, above which exists an optically thin continuum source. Spectral features are introduced into the continuum spectrum, arising from reflection and fluorescence when hard X-rays illuminate the disk. this is seen through an outer photoionized absorbing screen, which further modifies the observed spectrum.
Nandra Kirpal
Pounds Kenneth A.
Stewart Gordon C.
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