Other
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........1t&link_type=abstract
Ph.D. Thesis - Maryland Univ. National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, MD.
Other
2
Active Galaxies, Galactic Nuclei, Seyfert Galaxies, Sidereal Time, Variations, X Ray Sources, Heao 1, Instrument Errors, Radiation Detectors, Xenon
Scientific paper
Variations on time scales ranging from minutes to several hours in the X-ray flux from 54 observations of 38 active galaxies are identified. The sample is composed mostly of Seyfert I galaxies but also includes radio galaxies, NELG's BL Lacs and 3C 273. Only NGC 6814 varied on time scales as short as 100 sec. No other source was observed to vary with a time scale of less than 12 hours. Large amplitude short term variations are not a characteristic of the X-ray emission from active galaxies. Upper limits on sigmaI/I ranged from 2% for Cen A, 5% for NGC 4151, to approximately 20% for sources giving 1 ct/sec in the detector. Three objects NGC 3227, NGC 4151 and MCG 5-23-16 show variability consistent with a time scale of approximately 1 day. Ways to reconcile the rapid variability seen for NGC 6814 (and NGC 4051) with the general stability observed for the other objects are considered.
Mushotzky Richard F.
Tennant Allyn F.
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