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Probing the Inner Region of Cygnus X-1 in the Low/hard State through Its X-ray Broadband Spectrum
| Content Provider | Semantic Scholar |
|---|---|
| Author | Salvo, Tiziana Di Done, Chris Burderi, Luciano Robba, N. R. Ycki, P. T. Z. |
| Copyright Year | 2014 |
| Abstract | We present the broadband X-ray spectrum of Cyg X-1 in the low/hard state as observed by the instruments on board BeppoSAX. The spectrum spans from 0.1 to 200 keV, allowing the total accretion luminosity to be observed rather than extrapolated, corresponding to D2% of the Eddington limit for a 10 black hole. The broad bandpass allows us to determine the continuum shape with great accuracy. M _ Simple models of Compton upscattering of seed photons from the accretion disk do not adequately match the spectrum. At low energies an additional continuum component is required, giving a complex soft excess which extends up to D4 keV, in line with previous results from ASCA. Moreover, we clearly detect a reÑected component from the accretion disk that is smeared, probably because of relativistic and Doppler e†ects. The reÑecting material is not strongly ionized and does not subtend a large solid angle as seen from the corona ()/2n D 0.1È0.3). The estimated inner radius of the disk, which depends on the inclination of the system, is most probably between 10 and 70 gravitational radii An unsmeared (R g ). reprocessed component, probably originating from the companion star or the outer disk, could also be present. In this case, the inner radius of the disk, as inferred from the smeared reÑection, is smaller, between and 6R g 20R g . Subject headings : accretion, accretion disks È black hole physics È stars : individual (Cygnus X-1) È X-rays : general È X-rays : stars |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://dro.dur.ac.uk/2040/1/2040.pdf?DDD25+dph0cd |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | ANOVA–simultaneous component analysis Apache Continuum Black Hole CygnusEd Professional Diagnostic radiologic examination Energy, Physics Extrapolation GUCY2C protein, human Genus Asca Inference Instrument - device Kiloelectronvolt Medical Subject Headings Offset binary Photons Rajiformes Reprocess Stars, Celestial antineoplaston A10 |
| Content Type | Text |
| Resource Type | Article |
