Inferring the iron K emissivity profiles of accretion discs irradiated by extended coronae

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00597511" target="_blank" >RIV/67985815:_____/24:00597511 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0355449" target="_blank" >https://hdl.handle.net/11104/0355449</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stae1714" target="_blank" >10.1093/mnras/stae1714</a>

Result language

angličtina

Original language name

Inferring the iron K emissivity profiles of accretion discs irradiated by extended coronae

Original language description

One of the most promising methods to measure the spin of an accreting black hole is fitting the broad iron K alpha line in the X-ray spectrum. The line profile also depends on the geometry of the hard X-ray emitting corona. To put constraints on the black hole spin and corona geometry, it is essential to understand how do they affect the iron K alpha line emissivity profile. In this work, we present calculations of the illumination and the iron K alpha emissivity profiles performed with the Monte Carlo GR radiative transfer code monk. We focus on distinction between the illumination and emissivity profiles, which is in most previous studies neglected. We show that especially for the case of black hole X-ray binaries (BHXRBs), the difference is very large. For active galactic nuclei (AGNs), the emissivity profile has a more similar shape as the illumination profile, but it is notably steeper in the innermost region within a few gravitational radii. We find out that the different behaviour between AGN and BHXRB discs is due to the different energy spectra of the illuminating radiation. This suggests that the emissivity profile of the iron K alpha line cannot be determined by black hole spin and corona geometry alone and the energy spectrum of the illuminating radiation has to be taken into account. We also examined the effect of including the self-irradiation, and find it to be more important than the corona emission in BHXRBs.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GX21-06825X" target="_blank" >GX21-06825X: Accreting Black Holes in the new era of X-ray polarimetry missions</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Volume of the periodical

532

Issue of the periodical within the volume

4

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

3786-3796

UT code for WoS article

001281876300011

EID of the result in the Scopus database

2-s2.0-85199917030