Detailed Information on Publication Record
2005
QPOs in microquasars and Sgr A*: measuring the black hole spin
TÖRÖK, GabrielBasic information
Original name
QPOs in microquasars and Sgr A*: measuring the black hole spin
Authors
Edition
Astronomische Nachrichten, WEINHEIM, WILEY-V C H VERLAG GMBH, 2005, 0004-6337
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Confidentiality degree
není předmětem státního či obchodního tajemství
Organization unit
Faculty of Philosophy and Science in Opava
UT WoS
000233488500014
Keywords in English
black hole physics; X-ray variability
Tags
Tags
International impact, Reviewed
Změněno: 12/4/2021 14:13, RNDr. Kateřina Klimovičová, Ph.D.
Abstract
V originále
In all four microquasars which show double peak kHz QPOs, the ratio of the two frequencies is 3:2. This strongly supports the suggestion that twin peak kHz QPOs are due to a resonance between some modes of accretion disk oscillations. Here, we stress that fits to observations of the hypothetical resonances between vertical and radial epicyclic frequencies (particularly of the parametric resonance) give an accurate estimate of the spin for the three microquasars with known mass. Measurement of double peak QPOs frequencies in the Galaxy centre seems also to be consistent with the 3:2 ratio established by previous observations in microquasars, however the Sgr A* data are rather difficult for the same exact analysis. If confirmed, the 3:2 ratio of double peak QPOs in Sgr A* would be of a fundamental importance for the black hole accretion theory and the precise measurement could help to solve the question of QPOs nature.