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Quasi-Periodic Oscillation Frequency-Color Radius Connection in GRS 1915+105: A Possible Turnover Supporting Accretion-Ejection Instability Predictions

V.J. Mikles P. Varniere 1 S.S. Eikenberry J. Rodriguez 2 D. Rothstein
1 APC-Gravitation - APC - Gravitation
APC (UMR_7164) - AstroParticule et Cosmologie, AEI - Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut )
Abstract : 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.
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http://hal.in2p3.fr/in2p3-00371810
Contributor : Simone Lantz <>
Submitted on : Tuesday, March 31, 2009 - 12:02:02 PM
Last modification on : Friday, November 27, 2020 - 11:24:20 AM

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V.J. Mikles, P. Varniere, S.S. Eikenberry, J. Rodriguez, D. Rothstein. Quasi-Periodic Oscillation Frequency-Color Radius Connection in GRS 1915+105: A Possible Turnover Supporting Accretion-Ejection Instability Predictions. The Astrophysical journal letters, Bristol : IOP Publishing, 2009, 694, pp.L132-L135. ⟨10.1088/0004-637X/694/2/L132⟩. ⟨in2p3-00371810⟩

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