Počet záznamů: 1

Role of emission angular directionality in spin determination of accreting black holes with a broad iron line

  1. 1.
    0332636 - ASU-R 2010 RIV FR eng J - Článek v odborném periodiku
    Svoboda, Jiří - Dovčiak, Michal - Goosmann, René - Karas, Vladimír
    Role of emission angular directionality in spin determination of accreting black holes with a broad iron line.
    Astronomy & Astrophysics. Roč. 507, č. 1 (2009), s. 1-17 ISSN 0004-6361
    Grant CEP: GA ČR GA205/07/0052; GA ČR GD205/09/H033; GA MŠk(CZ) LC06014; GA AV ČR IAA300030510; GA MŠk ME09036
    Grant ostatní: EU(XE) ESA-PECS project No. 98040
    Výzkumný záměr: CEZ:AV0Z10030501
    Klíčová slova: accretion disc * black hole physics * active galaxies
    Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
    Impakt faktor: 4.179, rok: 2009

    We discuss the method to determine the spin of black holes by employing the broad relativistic iron line profiles in the X-ray domain. The precision of the spectral fitting procedure could be compromised by an inappropriate account for the angular distribution of the disc emission. Often a unique profile is assumed, invariable over the entire range of radii in the disc and energy in the spectral band. We study how sensitive the spin determination is to the assumptions about the intrinsic angular distribution of the emitted photons. Based on the radiation transfer computations, we produced a new extension to the KY software package for X-ray spectra fitting of relativistic accretion disc models. We found that, from the commonly used simple profiles, the isotropic distribution of the angular emissivity reproduces our model data to the best precision.
    Trvalý link: http://hdl.handle.net/11104/0177839