A1 Refereed original research article in a scientific journal

Discovery of correlated optical/X-ray quasi-periodic oscillations in black hole binary SWIFT J1753.5–0127




AuthorsAlexandra Veledina, Mikhail G. Revnivtsev, Martin Durant, Poshak Gandhi, Juri Poutanen

PublisherOxford University Press

Publication year2015

JournalMonthly Notices of the Royal Astronomical Society

Journal acronymMNRAS

Volume454

Issue3

First page 2855

Last page2862

Number of pages8

ISSN0035-8711

DOIhttps://doi.org/10.1093/mnras/stv2201

Web address http://arxiv.org/abs/1509.06768


Abstract

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.




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