Testing general relativity using quasiperiodic oscillations from Xray black holes: XTE J1550564 and GRO J165540
Abstract
We use the Relativistic Precession Model (RPM) and quasiperiodic oscillation (QPO) observations from the Rossi Xray Timing Explorer to derive constraints on the properties of the black holes that power these sources and to test general relativity (GR) in the strong field regime. We build upon past techniques by using pairs of simultaneously measured QPOs, rather than triplets, and by including characteristic frequencies from the broad noise components of the power spectra in our fits. We find the inclusion of these broad noise components causes an overestimate in masses and underestimate in spins compared to values derived independently from optical spectra. We extend the underlying spacetime metric to constrain potential deviations from the predictions of GR for astrophysical black holes. To do this, we modify the RPM model to a KerrNewmandeSitter spacetime and model changes in the radial, ecliptic, and vertical frequencies. We compare our models with Xray data of XTE J1550564 and GRO J165540 using robust statistical techniques to constrain the parameters of the black holes and the deviations from GR. For both sources, using QPO and characteristic frequency data, we constrain particular deviations from GR to be less than one part per thousand.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 November 2022
 DOI:
 10.1093/mnras/stac2740
 arXiv:
 arXiv:2107.06828
 Bibcode:
 2022MNRAS.517.1389R
 Keywords:

 accretion;
 accretion discs;
 black hole physics;
 gravitation;
 relativistic processes;
 Xrays: GRO J165540;
 Xrays: XTE J1550564;
 Astrophysics  High Energy Astrophysical Phenomena;
 General Relativity and Quantum Cosmology
 EPrint:
 9 pages, 7 figures