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

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

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..513..373d&link_type=abstract

NUCLEAR AND CONDENSED MATTER PHYSICS: VI Regional Conference. AIP Conference Proceedings, Volume 513, pp. 373-376 (2000).

Physics

Condensed Matter

Black Holes, Accretion And Accretion Disks

Scientific paper

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 ~2.6×1037 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: Rin>200 Rg. .

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