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DC Field | Value | Language |
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dc.contributor.author | Mohan, Prashanth | - |
dc.contributor.author | Mangalam, A | - |
dc.date.accessioned | 2014-07-31T05:57:09Z | - |
dc.date.available | 2014-07-31T05:57:09Z | - |
dc.date.issued | 2014-08-20 | - |
dc.identifier.citation | The Astrophysical Journal, Vol. 791, No. 2, 74 | en |
dc.identifier.issn | 0004-637X | - |
dc.identifier.uri | http://hdl.handle.net/2248/6641 | - |
dc.description | Restricted Access | en |
dc.description.abstract | We present theoretical models of X-ray variability attributable to orbital signatures from an accretion disk including emission region size, quasi-periodic oscillations (QPOs), and its quality factor Q, and the emergence of a break frequency in the power spectral density shape. We find a fractional variability amplitude of $F_{{\rm var}}\propto M^{-0.4}_{\bullet }$. We conduct a time series analysis on X-ray light curves (0.3-10 keV) of a sample of active galactic nuclei (AGNs). A statistically significant bend frequency is inferred in 9 of 58 light curves (16%) from 3 AGNs for which the break timescale is consistent with the reported BH spin but not with the reported BH mass. Upper limits of 2.85 × 107 M ☉ in NGC 4051, 8.02 × 107 M ☉ in MRK 766, and 4.68 × 107 M ☉ in MCG-6-30-15 are inferred for maximally spinning BHs. For REJ 1034+396 where a QPO at 3733 s was reported, we obtain an emission region size of (6-6.5) M and a BH spin of a lsim 0.08. The relativistic inner region of a thin disk, dominated by radiation pressure and electron scattering, is likely to host the orbital features as the simulated Q ranges from 6.3 × 10–2 to 4.25 × 106, containing the observed Q. The derived value of Q ~ 32 for REJ 1034+396 therefore suggests that the AGN hosts a thin disk. | en |
dc.language.iso | en | en |
dc.publisher | IOP Publishing | en |
dc.relation.uri | http://dx.doi.org/10.1088/0004-637X/791/2/74 | en |
dc.rights | © IOP Publishing | en |
dc.subject | Accretion, accretion disks | en |
dc.subject | Black hole physics | en |
dc.subject | Galaxies: active | en |
dc.subject | Galaxies: Seyfert | en |
dc.subject | Methods: statistical | en |
dc.title | X-ray variability and the inner region in active galactic nuclei | en |
dc.type | Article | en |
Appears in Collections: | IIAP Publications |
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X-ray variability and the inner region in active galactic nuclei.pdf Restricted Access | Restricted Access | 6.62 MB | Adobe PDF | View/Open Request a copy |
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