The variability of X-ray emission from active galaxies

Details The variability of X-ray emission from active galaxies The variability of X-ray emission from active galaxies

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..987m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 194, Mar. 1981, p. 987-1002.

Astronomy and Astrophysics

Astronomy

143

Active Galaxies, Galactic Radiation, Variability, X Ray Sources, Ariel 5 Satellite, Bl Lacertae Objects, Light Curve, Proportional Counters, Quasars, Red Shift, Seyfert Galaxies, Sky Surveys (Astronomy)

Scientific paper

Observations by the Ariel V Sky Survey Instrument extending over a 5-yr period were used to investigate the variability of the X-ray emission from 28 active galaxies. There is evidence for variability by a factor of up to 2 on time-scales of not more than 1 yr in about 50 per cent of the sources. X-ray flux variations on a time-scale of 0.5-5 day are reported for a number of sources including the QSOs 0241 + 622 and 3C 273. In some cases these variations take the form of short outbursts with an implied 2-10 keV energy content of 10 to the 47th to 10 to the 50th erg. No clear distinction is found in the X-ray variability of active galaxies with differing morphology or X-ray luminosity.

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