X-ray variability of quasars

Details X-ray variability of quasars X-ray variability of quasars

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278...28z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 1, 1984, p. 28-36. Research supported by the Consiglio Nazionale

Astronomy and Astrophysics

Astrophysics

67

Quasars, X Ray Sources, Heao 2, Statistical Analysis, Variability

Scientific paper

Fifty-one previously known quasars observed with the Einstein Observatory have been analyzed for intensity variations on time scales ranging from a few hundred seconds to 18 months. While none of them has shown variability on a very short time scale, four of the quasars have been seen to vary on a time scale of about 1 day. As about 30 objects could be analyzed on this time scale, it is concluded that 1 day appears to be a relatively common time scale for variability. On longer time scales (6-18 months), nine out of 12 quasars which could be analyzed show variability. However, in contrast to results previously reported for BL Lac objects, no variation in quasar luminosity larger than a factor of 2 has been observed.

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