Hard Power-law Components in the Spectra of Z Sources

Details Hard Power-law Components in the Spectra of Z Sources Hard Power-law Components in the Spectra of Z Sources

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.2504d&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #25.04; Bulletin of the American Astronomical Society, Vol. 32, p.1220

Astronomy and Astrophysics

Astronomy

Scientific paper

Recently the broad band capabilities of BeppoSAX have detected the presence of hard excess, above 20 keV, in Low Mass X-ray Binaries of the Z class, that can be fit to power laws. These components are variable and their presence is probably connected to the state of the source. In particular, for every source in which this component has been observed, its intensity seems to be larger at lower accretion rates and seems to decrease at higher accretion rates. Here we review these observations and discuss about the possible origin of these hard tails.

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