X-Ray Quasi-periodic Oscillations in the Lense-Thirring Precession Model. II. Variability of the Relativistic Iron K alpha Line

0537278 - ASÚ 2021 RIV US eng J - Článek v odborném periodiku
You, B. - Zycki, P. - Ingram, A. - Bursa, Michal - Wang, W.
X-Ray Quasi-periodic Oscillations in the Lense-Thirring Precession Model. II. Variability of the Relativistic Iron K alpha Line.
Astrophysical Journal. Roč. 897, č. 1 (2020), č. článku 27. ISSN 0004-637X. E-ISSN 1538-4357
Institucionální podpora: RVO:67985815
Klíčová slova: accretion * black hole physics * compton reflection
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.877, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.3847/1538-4357/ab9838

In the article, in the scenario of the Lense-Thirring precession of the X-ray source, we use a Monte Carlo simulation of radiative transfer to study the irradiation/reflection and the resultant spectral properties including the Fe K alpha line as a function of precession phase (time). We found that the reflection fraction, i.e., the ratio of incident flux toward the disk and the direct flux toward the observer at infinity, is modulated by the precession phase, which depends on the truncation radius (i.e., the spectral state in the truncated disk model) and the inclination angle. The Fe K alpha line profile also changes as the primary X-ray source precesses, with the line luminosity and the flux-weighted centroid energy varying with the precession phase. The periodically modulated 2-10 keV continuum flux could apparently lag the line luminosity in phase, if the truncation radius is small enough for Doppler effects due to disk orbital motion to significantly affect the observed radiation.
Trvalý link: http://hdl.handle.net/11104/0315014