Relationship between X-ray spectral index and X-ray Eddington ratio for Mrk 335 and Ark 564

We present a comprehensive flux-resolved spectral analysis of the bright narrow-line Seyfert 1 AGNs, Mrk 335 and Ark 564 using observations by XMM–Newton satellite. The mean and the flux-resolved spectra are fitted by an empirical model consisting of two Comptonization components, one for the low-en...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2015-04, Vol.448 (2), p.1541-1550
Main Authors: Sarma, R., Tripathi, S., Misra, R., Dewangan, G., Pathak, A., Sarma, J. K.
Format: Article
Language:English
Subjects:
Astronomy
Empirical analysis
Geometry
Iron
Low energy
Luminosity
Mathematical models
Power law
Spectra
Spectrum analysis
X-ray astronomy
X-rays
XMM (spacecraft)
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Summary:We present a comprehensive flux-resolved spectral analysis of the bright narrow-line Seyfert 1 AGNs, Mrk 335 and Ark 564 using observations by XMM–Newton satellite. The mean and the flux-resolved spectra are fitted by an empirical model consisting of two Comptonization components, one for the low-energy soft excess and the other for the high-energy power law. A broad iron line and a couple of low-energy edges are required to explain the spectra. For Mrk 335, the 0.3–10 keV luminosity relative to the Eddington value, L X/L Edd, varied from 0.002 to 0.06. The index variation can be empirically described as Γ = 0.6 log10 L X/L Edd + 3.0 for 0.005 
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stv005