CAOSP abstracts, Volume: 49, No.: 1, year: 2019

Author(s): Huang, C.-Y.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 49, no. 1, p. 7-18.
Date: 2/2019
Title: Estimating the black hole mass of NGC 1313 X-1 based on the spectral and timing properties
Keyword(s): accretion, accretion disks, black hole physics, magnetic fields, stars: individual: NGC 1313 X-1
Pages: 7 -- 18
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: The discovery of 3:2 quasi-periodic oscillations (QPOs) in the ultraluminous X-ray source NGC 1313 X-1 suggests it harbors an intermediate-mass black hole (IMBH). We test this numerically by modelling the 3:2 QPOs and the associated X-ray spectrum based on the epicyclic resonance model and a disk-corona model with large-scale magnetic fields generated by the Cosmic Battery mechanism. The combined QPO-frequency and spectral fitting indicates that the BH mass ranges from 2524M_☉ to 6811M_☉ confirming its IMBH nature, and the BH spin is probably higher than ∼ 0.3.

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