An extended X-ray low state from Hercules X-1

Details An extended X-ray low state from Hercules X-1 An extended X-ray low state from Hercules X-1

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.313..119p&link_type=abstract

Nature (ISSN 0028-0836), vol. 313, Jan. 10, 1985, p. 119-121.

Astronomy and Astrophysics

Astronomy

59

Accretion Disks, Light Curve, Pulsars, Spaceborne Astronomy, X Ray Sources, Crab Nebula, Degrees Of Freedom, European Space Agency, Exosat Satellite

Scientific paper

Observations of Hercules X-1 made with the EXOSAT Observatory between June and August 1983 are reported that failed to detect the expected 35-day variation in X-ray intensity, although low-level extended X-ray emission was seen. The duration of the X-ray eclipse ingress or egress gives a radius for the occulted low-state X-ray emission region of about 5 x 10 to the 10th cm. This figure is comparable to estimates for the radius of the accretion disk and confirms the suggestion that the majority of the low-state X-ray emission comes from X-rays scattered by an accretion disk corona from the central source to the observer around the occulting disk. The results indicate that a temporary change in the disk structure may have occurred such that the disk was in the line of sight throughout.

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