Statistics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4805p&link_type=abstract
American Astronomical Society, AAS Meeting #211, #48.05; Bulletin of the American Astronomical Society, Vol. 39, p.809
Statistics
Scientific paper
We analyzed XMM-Newton observations of three black hole candidates in their quiescent states. Our goal was to shed light on the origin of X-ray emission in case of extremely low accretion rates. It has been proposed that below a critical X-ray luminosity (LX, crit 10-5.5 LEdd) the X-ray emission will be dominated by the contribution of the jet (Yuan & Cui 2005). One of the consequences of this is that even at the lowest accretion levels the spectrum has power-law shape as opposed to a curved shape in log-log plot, that one would expect from inverse-Compton scattering by hot accretion flows.
All three sources are well below the supposed critical X-ray luminosity (LX} 1.4 × 10-7 LEdd, 6.7 × 10-7 LEdd, 2 × 10-7 LEdd for GRO J1655-40, V404 Cyg, and XTE J1550-564 respectively).
Analyzing observations on GRO J1655-40 (185 ks) and on V404 Cyg (40 ks) we conclude that the X-ray emission indeed comes mainly from a jet in these systems, while the situation is ambiguous, limited by statistics in the case of XTE J1550-564 (59 ks), because most of the data was compromised by strong solar activity.
Cui Wei-Wei
Pszota Gabor
Yuan Fang-Fang
Zhang Huazhong
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