Spectra of puffy accretion discs: the kynbb fit

0575374 - ASÚ 2024 RIV US eng J - Journal Article
Lančová, D. - Yilmaz, Anastasiya - Wielgus, M. - Dovčiak, Michal - Straub, O. - Török, G.
Spectra of puffy accretion discs: the kynbb fit.
Astronomische Nachrichten. Roč. 344, č. 4 (2023), č. článku e20230023. ISSN 0004-6337. E-ISSN 1521-3994
R&D Projects: GA ČR(CZ) GX21-06825X
Institutional support: RVO:67985815
Keywords : astrophysics * high energy astrophysical phenomena
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 0.9, year: 2022
Method of publishing: Limited access
https://doi.org/10.1002/asna.20230023

Puffy disc is a numerical model, expected to capture the properties of the accretion flow in X‑ray black hole (BH) binaries in the luminous, mildly sub‑Eddington state. We fit the kerrbb and kynbb spectral models in XSPEC to synthetic spectra of puffy accretion discs, obtained in general relativistic radiative magnetohydrodynamic simulations, to see if they correctly recover the BH spin and mass accretion rate assumed in the numerical simulation. We conclude that neither of the two models is capable of correctly recovering the puffy disc parameters, which highlights a necessity to develop new, more accurate spectral models for the luminous regime of accretion in X‑ray BH binaries. We propose that such spectral models should be based on the results of numerical simulations of accretion.

Permanent Link: https://hdl.handle.net/11104/0345168