X-ray luminosity and spectral variability of hard X-ray-selected active galactic nuclei

Details X-ray luminosity and spectral variability of hard X-ray-selected active galactic nuclei X-ray luminosity and spectral variability of hard X-ray-selected active galactic nuclei

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...82...93g&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 82, no. 1, Sept. 1992, p. 93-116. Research supported by ASI and M

Astronomy and Astrophysics

Astrophysics

48

Active Galactic Nuclei, Astronomical Spectroscopy, Light Curve, Luminosity, Quasars, X Ray Sources, Emission Spectra, Exosat Satellite, Variability

Scientific paper

Luminosity and spectral variability are analyzed in a sample of AGNs from Exosat data based on the soft (LE: 0.05-2 keV) and hard (ME: 1-8 keV) light curves. Specific attention is given to flux variability noted in the objects that are observed at least twice, and time variations and fast variability are also reported. The 14 sources that show simultaneous long time variations in both light-curve ranges are also investigated in terms of spectral variability. Flux variability is shown to be very common in AGNs, and a subsample of the AGNs demonstrated changes in spectral shape with flux. Variations in the ratio of the hard/soft light curves are found to be present in 63 percent of the objects investigated. The study of X-ray luminosity and spectral variability in hard-X-ray-selected AGNs shows that no unique spectral behavior can be associated with the objects. Source spectra can be dominated by either a soft independent component or by a variable absorber when ME/LE color steepens.

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