Investigating the origin of the Fe emission lines of the Seyfert 1 galaxy Mrk~205

Abstract

We have investigated the nature and origin of the Fe K emission lines in Mrk~205 using observations with {\it Suzaku} and {\it XMM-Newton}, aiming to resolve the ambiguity between a broad emission line and multiple unresolved lines of higher ionization. We detect the presence of a narrow Fe K$\alpha$ emission line along with a broad band Compton reflection hump at energies $E>10\mathrm{keV}$. These are consistent with reflected emission of hard X-ray photons off a Compton thick material of $N_{\mathrm{H}}\ge 2.15\times 10^{24}\mathrm{c}{\mathrm{m}}^{-2}$. In addition we detect a partially covering ionized absorption with ionization parameter $\log (\xi /\mathrm{erg}\mathrm{cm}{\mathrm{s}}^{-1})=1.9_{-0.5}^{+0.1}$, column density $N_{\mathrm{H}}=(5.6_{-1.9}^{+2.0})\times 10^{22}\mathrm{c}{\mathrm{m}}^{-2}$ and a covering factor of $0.22_{-0.06}^{+0.09}$. We detect the presence of emission arising out of ionized disk reflection contributing in the soft and the hard X-rays consistently in all the observations. We however, could not definitely ascertain the presence of a relativistically broadened Fe line in the X-ray spectra. Using relativistic reflection model, we found that the data are unable to statistically distinguish between the scenarios when the super-massive black hole is non-rotating and when it is maximally spinning. Using the disk reflection model we also find that the accretion disk of the AGN may be truncated at a distance $6R_{\mathrm{G}}<R<12R_{\mathrm{G}}$, which may suggest why there may not be any broad Fe line. The Eddington rate of the source is low (${\lambda }_{\mathrm{Edd}}=0.03$), which points to an inefficient accretion, possibly due to a truncated disk.

Accepted for publication in MNRAS

References in corpus (5)

• Piecing Together the X-ray Background: Bolometric Corrections for Active Galactic Nuclei
• An absorption origin for the X-ray spectral variability of MCG-6-30-15
• X-ray Absorption and Reflection in Active Galactic Nuclei
• The narrow Fe K$\alpha$ line and the molecular torus in active galactic nuclei - an IR/X-ray view
• An X-ray look at the Seyfert 1 Galaxy Mrk 590: XMM-Newton and Chandra reveal complexity in circumnuclear gas

Cited by in corpus (4)

• An X-ray spectral study of the origin of reflection features in bare Seyfert 1 galaxy ESO 511--G030
• The origin of the vanishing soft X-ray excess in the changing-look Active Galactic Nucleus Mrk 590
• A weakening Compton hump and soft X-ray excess detected in the Seyfert-1 galaxy MCG-02-58-22
• A radio, optical, UV and X-ray view of the enigmatic changing look Active Galactic Nucleus 1ES~1927+654 from its pre- to post-flare states