Measurement of Mass and Spin of Black Holes with QPOs

Details Measurement of Mass and Spin of Black Holes with QPOs Measurement of Mass and Spin of Black Holes with QPOs

2007-10-18

arxiv.org/abs/0710.3454v1

Astronomy and Astrophysics

Astrophysics

7 pages, talk given at the 2007 Frascati workshop, acc. for publication in the Chin. J. Astron. Astrophys

Scientific paper

There are now four low mass X-ray binaries with black holes which show twin resonant-like HFQPOs. Similar QPOs might have been found in Sgr A*. I review the power spectral density distributions of the three X-ray flares and the six NIR flares published for Sgr A* so far, in order to look for more similarities than just the frequencies between the microquasar black holes and Sgr A*. The three X-ray flares of Sgr A* are re-analysed in an identical way and white noise probabilities from their power density distributions are given for the periods reported around 1100 s. Progress of the resonant theory using the anomalous orbital velocity effect is summarized.

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