2003A&A...397..729V


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET04:22:59

2003A&A...397..729V - Astronomy and Astrophysics, volume 397, 729-738 (2003/1-2)

Tracing the power-law component in the energy spectrum of black hole candidates as a function of the QPO frequency.

VIGNARCA F., MIGLIARI S., BELLONI T., PSALTIS D. and VAN DER KLIS M.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): accretion: accretion disks - black hole physics - stars: oscillations - X-rays: stars

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1056 0
2 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 435 0
3 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1741 1
4 AX J1748.0-2829 LXB 17 48 05.060 -28 28 25.80     13.60     ~ 174 0
5 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2346 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-04:22:59

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