Relativistic smearing detected in the spectrum of Cyg X-1 in hard state

Di Salvo, Tiziana; Burderi, Luciano; Robba, Natale R.; La Barbera, Nino; Done, Chris
April 2000
AIP Conference Proceedings;2000, Vol. 513 Issue 1, p373
Academic Journal
We report on an observation of the black hole candidate Cyg X-1 performed by the Narrow Field Instruments on board BeppoSAX satellite. During the BeppoSAX observation Cyg X-1 was in its usual low (hard) state with a 0.1–200 keV luminosity of ∼2.6×10[sup 37] erg/s, adopting a distance of 2.5 kpc. The broad band spectrum (0.1–30 keV) is well fitted by an absorbed power-law partially reflected by cold matter and a soft excess. The reprocessed component is relativistically smeared and the inferred inner radius of the disc is 20±10 gravitational radii. This inner radius is much smaller than the prediction of the so called Advection Dominated Accretion Flow models: R[sub in]>200 R[sub g]. © 2000 American Institute of Physics.


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