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Rapid X-ray variability in Cygnus X-l
Department of Astronomy, Stockholm University.ORCID-id: 0000-0003-4378-8785
2008 (engelsk)Inngår i: Cool Discs, Hot Flows: The Varying Faces of Accreting Compact Objects, 2008, Vol. 1054, s. 135-141Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

In this paper, results from temporal analysis of RXTE observations of the black hole binary Cygnus X-l are reviewed. By tapping into the large amount of archival data available, a systematic study of the variability, in the form of the power spectrum, is conducted. It is clear that timing studies can give valuable information on the emission mechanisms and accretion geometry. Tying characteristic frequencies to effects predicted by general relativity directly gives information about the parameters of the compact object. The results show that the characteristic frequencies seen in the power spectrum follow the relation predicted for the nodal and periastron precessional frequencies of relativistic precession. From this relation, the spin of the black hole is determined to a*=0.48±0.01 for a mass of 9 M⊙. During times of high hardness, the hardness-flux correlation seen in the hard state of the source disappears on short timescales. Together with the variable characteristic frequencies, this is interpreted as support for the truncated disk scenario.

sted, utgiver, år, opplag, sider
2008. Vol. 1054, s. 135-141
Serie
AIP Conference Proceedings, ISSN 0094-243X ; 1054
Emneord [en]
Accretion, accretion disks, X-rays: binaries, X-rays: individual: Cyg X-1
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-84610DOI: 10.1063/1.3002496Scopus ID: 2-s2.0-55549129967OAI: oai:DiVA.org:kth-84610DiVA, id: diva2:499425
Konferanse
Cool Discs, Hot Flows: The Varying Faces of Accreting Compact Objects. Funasdalen. 25 March 2008 - 30 March 2008
Merknad

QC 20120510

Tilgjengelig fra: 2012-02-13 Laget: 2012-02-13 Sist oppdatert: 2020-05-11bibliografisk kontrollert

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