A theoretical study of the time lags due to Comptonization and the constraints on the X-ray corona in AGNs

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00570192" target="_blank" >RIV/67985815:_____/23:00570192 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnras/stac3625" target="_blank" >https://doi.org/10.1093/mnras/stac3625</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stac3625" target="_blank" >10.1093/mnras/stac3625</a>

Result language
angličtina
Original language name
A theoretical study of the time lags due to Comptonization and the constraints on the X-ray corona in AGNs
Original language description
We study the Fourier time lags due to the Comptonization of disc-emitted photons in a spherical, uniform, and stationary X-ray corona, which located on the rotational axis of the black hole. We use MONK, a general relativistic Monte Carlo radiative transfer code, to calculate Compton scattering of photons emitted by a thin disc with a Novikov-Thorne temperature profile. We find that the model time lags due to Comptonization remain constant up to a characteristic frequency and then rapidly decrease to zero at higher frequencies. We provide equations that can be used to determine the time lags and cross-spectra for a wide range of values for the corona radius, temperature, optical depth, height, and for various accretion rates and black hole masses. We also provide an equation for the X-ray luminosity of a single corona, as a function of its characteristics and location above the disc. Remarkably, the observed X-ray time lags of nearby, bright active galaxies can be successfully reproduced by inverse Comptonization process of multiple dynamic coronae.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
<a href="/en/project/GA18-00533S" target="_blank" >GA18-00533S: Reverberation from Black Hole accretion discs</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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