2019MNRAS.487..667C


Query : 2019MNRAS.487..667C

2019MNRAS.487..667C - Mon. Not. R. Astron. Soc., 487, 667-680 (2019/July-3)

X-ray time lags in AGN: inverse-Compton scattering and spherical corona model.

CHAINAKUN P., WATCHARANGKOOL A., YOUNG A.J. and HANCOCK S.

Abstract (from CDS):

We develop a physically motivated, spherical corona model to investigate the frequency-dependent time lags in active galactic nucleus (AGN). The model includes the effects of Compton up-scattering between the disc ultraviolet (UV) photons and coronal electrons, and the subsequent X-ray reverberation from the disc. The time lags are associated with the time required for multiple scatterings to boost UV photons up to soft and hard X-ray energies, and the light crossing time the photons take to reach the observer. This model can reproduce not only low-frequency hard and high-frequency soft lags, but also the clear bumps and wiggles in reverberation profiles, which should explain the wavy residuals currently observed in some AGNs. Our model supports an anti-correlation between the optical depth and coronal temperatures. In case of an optically thin corona, time delays due to propagating fluctuations may be required to reproduce observed time lags. We fit the model to the lag-frequency data of 1H0707-495, Ark 564, NGC 4051, and IRAS 13224-3809 estimated using the minimal bias technique so that the observed lags here are highest-possible quality. We find that their corona size is ∼7-15rg having the constrained optical depth ∼2-10. The coronal temperature is ∼150-300 keV. Finally, we note that the reverberation wiggles may be signatures of repeating scatters inside the corona that control the distribution of X-ray sources.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - black hole physics - galaxies: active - galaxies: individual: 1H0707-495 - galaxies: individual: Ark 564 - galaxies: individual: NGC 4051 - galaxies: individual: IRAS 13224-3809 - X-rays: galaxies

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Mrk 335 Sy1 00 06 19.5371542746 +20 12 10.617456059   14.19 13.85     ~ 1137 0
2 Mrk 1095 Sy1 05 16 11.4093760763 -00 08 59.158774578   14.30 13.92     ~ 809 1
3 4U 0708-49 Sy1 07 08 41.4887418009 -49 33 06.308287663   16.02 15.7 12.7   ~ 447 0
4 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 2042 1
5 2MASX J13251937-3824524 Sy1 13 25 19.3805503234 -38 24 52.611897329   16.64 13.80 15.33   ~ 365 0
6 UGC 12163 Sy1 22 42 39.3364258078 +29 43 31.301194419   14.86 14.16     ~ 637 1

    Equat.    Gal    SGal    Ecl

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2021.07.27-09:48:26

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