Spectra of puffy accretion discs: the kynbb fit

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 relativisti...

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Bibliographic Details
Published inAstronomische Nachrichten Vol. 344; no. 4
Main Authors Lančová, Debora, Yilmaz, Anastasiya, Wielgus, Maciek, Dovčiak, Michal, Straub, Odele, Török, Gabriel
Format Journal Article
LanguageEnglish
Published Weinheim WILEY‐VCH Verlag GmbH & Co. KGaA 01.05.2023
Wiley Subscription Services, Inc
Subjects
accretion
accretion discs
Accretion disks
black hole physics
Black holes
Deposition
Magnetohydrodynamic simulation
magnetohydrodynamics (MHD)
Mathematical models
Numerical models
radiative transfer
scattering
Spectra
X‐ray: Binaries
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Summary: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.
ISSN:0004-6337
1521-3994
DOI:10.1002/asna.20230023