The origin of the Fe K features in Markarian 205 and Markarian 509

We examine the 3-10 keV EPIC spectra of Mrk 205 and 509 to investigate their Fe K features. The most significant feature in the spectra of both objects is an emission line at 6.4 keV. The spectra can be adequately modelled with a power law and a relatively narrow (sigma < 0.2 keV) Fe Kalpha emission line. Better fits are obtained when an additional Gaussian emission line, relativistic accretion-disc line, or Compton reflection from cold material, is added to the spectral model. We obtain similar goodness of fit for any of these three models, but the model including Compton reflection from cold material offers the simplest, physically self-consistent solution, because it only requires one reprocessing region. Thus the Fe K spectral features in Mrk 205 and 509 do not present strong evidence for reprocessing in the inner, relativistic parts of accretion discs.

[1]  T. J. Turner,et al.  Physical Diagnostics from a Narrow Fe Kα Emission Line Detected by Chandra in the Seyfert 1 Galaxy NGC 5548 , 2000, astro-ph/0008471.

[2]  Robert Antonucci,et al.  Unified models for active galactic nuclei and quasars , 1993 .

[3]  J. Dickey,et al.  H I in the Galaxy , 1990 .

[4]  P. T. O'Brien,et al.  The first XMM-Newton spectrum of a high redshift quasar - PKS 0537-286 , 2000 .

[5]  H. Netzer,et al.  The emission lines of quasars and similar objects , 1979 .

[6]  G. Ferland,et al.  Optically thin broad-line clouds in active galactic nuclei , 1995 .

[7]  A. Zdziarski,et al.  Angle-dependent Compton reflection of X-rays and gamma-rays , 1995 .

[8]  Nicholas E. White,et al.  X-ray fluorescence from the inner disc in Cygnus X-1 , 1989 .

[9]  H. Kunieda,et al.  Gravitationally redshifted emission implying an accretion disk and massive black hole in the active galaxy MCG–6–30–15 , 1995, Nature.

[10]  D. Leahy,et al.  Monte Carlo simulations of X-ray spectra for internally illuminated spherical matter distributions , 1993 .

[11]  Andrew C. Fabian,et al.  X-ray reflection from cold matter in Active Galactic Nuclei and X-ray binaries , 1991 .

[12]  M. Goad,et al.  Broad Emission Line Variability as a Constraint upon the Physical Conditions within the Broad Emission Line Region of NGC 5548 , 1998 .

[13]  A. Wandel,et al.  Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. I. Comparing the Photoionization and Reverberation Techniques , 1999 .

[14]  C. Reynolds,et al.  An X-ray spectral study of 24 type 1 active galactic nuclei , 1997 .

[15]  Columbia,et al.  Multi-wavelength study of the Seyfert 1 galaxy NGC 3783 with XMM-Newton , 2002, astro-ph/0206316.

[16]  N. Grevesse,et al.  Abundances of the elements: Meteoritic and solar , 1989 .

[17]  P. T. O'Brien,et al.  XMM-Newton observation of an unusual iron line in the quasar Markarian 205 , 2000 .

[18]  K. Nandra,et al.  ASCA Observations of Seyfert 1 Galaxies. II. Relativistic Iron Kα Emission , 1996, astro-ph/9606169.