Discovery of correlated optical/X-ray quasi-periodic oscillations in black hole binary SWIFT J1753.5–0127
: Alexandra Veledina, Mikhail G. Revnivtsev, Martin Durant, Poshak Gandhi, Juri Poutanen
Publisher: Oxford University Press
: 2015
: Monthly Notices of the Royal Astronomical Society
: MNRAS
: 454
: 3
: 2855
: 2862
: 8
: 0035-8711
DOI: https://doi.org/10.1093/mnras/stv2201
: http://arxiv.org/abs/1509.06768
We report the discovery of the correlated optical/X-ray low-frequency quasi-periodic oscillations (QPOs) in black hole binary SWIFT J1753.5-0127. The phase lag between two light-curves at the QPO frequency is close to zero. This result puts strong constraints on the nature of the optical emission in this object and on the origin of the QPOs in general. We demonstrate that the QPO signal and the broadband variability can be explained in terms of the hot accretion flow radiating in both optical and X-ray bands. In this model, the QPO appears due to the Lense-Thirring precession of entire flow, while the broadband variability in the optical is produced by two components: the hot flow and the irradiated disc. Using the phase-lag spectra, we put a lower limit on the orbital inclination i>50 deg, which can be used to constrain the mass of the compact object.