Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-23
Astron.Astrophys. 397 (2003) 729-738
Astronomy and Astrophysics
Astrophysics
11 pages, 10 figures. Accepted for publication on Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20021542
We investigated the relation between the centroid frequency of the quasi-periodic oscillation observed in the power density spectra of a sample of galactic black-hole candidates with the power-law photon index obtained from spectral fits. Our aim is to avoid inner accretion disk radius determination directly from spectral fits, given the uncertainties of the absolute values obtained in that way, but to base our analysis on the likely association of QPO frequency to a characteristic radius. We used archival RXTE data of GRS 1915+105 and published parameters for GRO 1655-40, XTE J1550-564, XTE J1748-288 and 4U 1630-47. While for low values of the QPO frequency, the two parameters are clearly correlated for each source, there is evidence for a turnoff in the correlation above a characteristic frequency, different for different sources. We discuss the possible nature of this turnoff.
Belloni Tomaso
Migliari Simone
Psaltis Dimitrios
van der Klis Michiel
Vignarca F.
No associations
LandOfFree
Tracing the power-law component in the energy spectrum of black hole candidates as a function of the QPO frequency does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Tracing the power-law component in the energy spectrum of black hole candidates as a function of the QPO frequency, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tracing the power-law component in the energy spectrum of black hole candidates as a function of the QPO frequency will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-639927