NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-18 T09:50:18 PDT
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For refcode 2014MNRAS.443...72J:
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Copyright by Royal Astronomical Society. 2014MNRAS.443...72J Constraining black hole masses in low-accreting active galactic nuclei using X-ray spectra Jang, I.; Gliozzi, M.; Hughes, C.; Titarchuk, L. Abstract. In a recent work we demonstrated that a novel X-ray scaling method, originally introduced for Galactic black holes (BHs), can be reliably extended to estimate the mass of supermassive BHs accreting at a moderate to high level. Here we investigate the limits of applicability of this method to low-accreting active galactic nuclei (AGN), using a control sample with good-quality X-ray data and dynamically measured mass. For low-accreting AGN (L_X_/L_Edd_ <= 10^-4^), because the basic assumption that the photon index positively correlates with the accretion rate no longer holds the X-ray scaling method cannot be used. Nevertheless, the inverse correlation in the Gamma-L_X_/L_Edd_ diagram, found in several low-accreting BHs and confirmed by this sample, can be used to constrain M_BH_ within a factor of ~10 from the dynamically determined values. We provide a simple recipe to determine M_BH_ using solely X-ray spectral data, which can be used as a sanity check for M_BH_ determination based on indirect optical methods. Key words: black hole physics, galaxies: active, X-rays: general
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