Query : 2002A&A...387..487R

2002A&A...387..487R - Astronomy and Astrophysics, volume 387, 487-496 (2002/5-4)

Accretion-ejection instability and QPO in black hole binaries. I. Observations.


Abstract (from CDS):

This is the first of two papers in which we address the physics of the low-frequency Quasi-Periodic Oscillation (QPO) of X-ray binaries, in particular those hosting a black hole. We discuss and repeat the recent analysis and spectral modelling of the micro-quasar GRO J1655-40by Sobczak et al. (2000ApJ...531..537S, hereafter SMR), and compare it with GRS 1915+105; this leads us to confirm and analyze in more detail the different behavior noted by SMR, between GRS 1915+105and other sources, when comparing the correlation between the QPO frequency and the disk inner radius. In a companion paper (Varniere et al., 2002A&A...387..497V, hereafter Paper II) we will show that these opposite behaviors can be explained in the context of the Accretion-Ejection Instability recently presented by Tagger & Pellat (1999A&A...349.1003T). We thus propose that the difference between GRS 1915+105 and other sources comes from the fact that in the former, observed in a very high state, the disk inner radius always stays close to the Last Stable Orbit. In the course of this analysis, we also indicate interesting differences between the source properties, when the spectral fits give an anomalously low inner disk radius. This might indicate the presence of a spiral shock or a hot point in the disk.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - X-rays: binaries - stars: individual: GRS 1915+105, GRO J1655-40

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000   17.95 16.6     K3III 1135 0
2 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1837 1
3 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2530 0
4 GRO J1955-40 gam ~ ~           ~ 1 0

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