期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 438, 期 4, 页码 2980-2994出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt2424
关键词
accretion, accretion discs; galaxies: active; galaxies: Seyfert; X-rays: galaxies; X-rays: individual: NGC 4151
资金
- Royal Society
- CITA National Fellowship
- Science and Technology Facilities Council [ST/K000985/1, ST/J001538/1, ST/J001600/1] Funding Source: researchfish
- STFC [ST/J001600/1, ST/J001538/1, ST/K000985/1] Funding Source: UKRI
The recent detection of X-ray reverberation lags, especially in the Fe K alpha line region, around active galactic nuclei (AGN) has opened up the possibility of studying the time-resolved response (reflection) of hard X-rays from the accretion disc around supermassive black holes. Here, we use general relativistic transfer functions for reflection of X-rays from a point source located at some height above the black hole to study the time lags expected as a function of frequency and energy in the Fe K alpha line region. We explore the models and the dependence of the lags on key parameters such as the height of the X-ray source, accretion disc inclination, black hole spin and black hole mass. We then compare these models with the observed frequency- and energy-dependence of the Fe K alpha line lag in NGC 4151. Assuming the optical reverberation mapping mass of 4.6 x 10(7) M-circle dot, we get a best fit to the lag profile across the Fe K alpha line in the frequency range (1-2) x 10(- 5) Hz for an X-ray source located at a height h = 7(-2.6)(+2.9) with a maximally spinning black hole and an inclination i < 30 degrees.
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