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

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

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21540407m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #404.07; Bulletin of the American Astronomical Society, Vol. 42, p.226

Astronomy and Astrophysics

Astronomy

Scientific paper

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 theta-, beta-, and alpha-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.
VJM was supported in part by NSF grant AST-0507547.

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