2009ApJ...694L.132M -
Astrophys. J., 694, L132-L135 (2009/April-1)
Quasi-periodic oscillation frequency-color radius connection in GRS 1915+105: a possible turnover supporting accretion-ejection instability predictions.
MIKLES V.J., VARNIERE P., EIKENBERRY S.S., RODRIGUEZ J. and ROTHSTEIN D.
Abstract (from CDS):
It is widely believed that the low-frequency quasi-periodic X-ray oscillations observed in microquasars are correlated to, but do not originate at, the physical radius of the inner edge of the accretion disk. Models relating the quasi-periodic oscillation (QPO) frequency and color radius are hindered by observations showing contradicting trend correlations between the microquasars GRO 1655-40, XTE J1550-564, and GRS 1915+105. The first shows a negative correlation and the latter two a positive one. By taking into account relativistic rotation in the accretion disk, the accretion-ejection instability (AEI) model predicts a turnover in the frequency-radius relationship, and has been successfully compared with observations of GRO J1655-40 and GRS 1915+105. We present further evidence supporting the AEI model prediction by using observations of the microquasar GRS 1915+105. By combining a data set including θ-, β-, and α-class X-ray light curves, we observe positive, negative, and null correlations in the frequency-radius relationship. This is the first time a single source has shown a possible inversion in the QPO frequency-color radius curve predicted by the AEI model.
Abstract Copyright:
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Journal keyword(s):
accretion, accretion disks - black hole physics - stars: individual: GRS 1915+105 - stars: oscillations
Simbad objects:
3
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