Millisecond variability of Cygnus X-1

Details Millisecond variability of Cygnus X-1 Millisecond variability of Cygnus X-1

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..288m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 1, 1984, p. 288-297.

Astronomy and Astrophysics

Astronomy

40

Accretion Disks, Binary Stars, Black Holes (Astronomy), Cygnus Constellation, Variable Stars, X Ray Sources, Bursts, Heao 1, Shot Noise, Statistical Analysis, Time Measurement

Scientific paper

The May 7, 1978 HEAO 1 spacecraft observations of Cygnus X-1 with a 10 microsec time resolution have revealed 3 ms variability, as well as a 300 ms component and features which extend to 6 s. Emission on time scales shorter than 1 s can be approximately modeled as a superposition of uncorrelated 3 ms and 300 ms shot contributions, both with peak luminosities near 10 to the 37th ergs/s, and with shot rates of about 10/s and 0.2/s, respectively. The 3 ms variability is consistent with the time scales expected for variability near the inner edge of a viscous accretion disk that surrounds a 10-solar mass black hole.

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