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XMM-Newton observation of an unusual iron line in the quasar Markarian 205

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posted on 24.10.2012, 09:22 by J. N. Reeves, M. J. L. Turner, K. A. Pounds, P. T. O'Brien, T. Boller, P. Ferrando, E. Kendziorra, S. Vercellone
XMM-Newton observations of the low luminosity, radio-quiet quasar Markarian 205 have revealed a unique iron K emission line profile. In marked contrast to the broad and redshifted iron K line commonly seen in ASCA observations of Seyfert 1 galaxies, we find that a substantial amount of the line flux in Mrk 205 occurs above the neutral line energy of 6.4 keV. Furthermore, we find that the iron line emission has two distinct components, a narrow, unresolved neutral line at 6.4 keV and a broadened line centred at 6.7 keV. We suggest that the most likely origin of the 6.7 keV line is from X-ray reflection off the surface of a highly ionised accretion disk, whilst the 6.4 keV component may arise from neutral matter distant from the black hole, quite possibly in the putative molecular torus. Overall this observation underlines the potential of XMM-Newton for using the iron K line as a diagnostic of matter in the innermost regions of AGN.

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Citation

Astronomy & Astrophysics, 2001, 365 (1)

Version

VoR (Version of Record)

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Astronomy & Astrophysics

Publisher

EDP Sciences for European Southern Observatory (ESO)

issn

0004-6361

Copyright date

2001

Available date

24/10/2012

Publisher version

http://www.aanda.org/articles/aa/abs/2001/01/aaxmm06/aaxmm06.html

Language

en

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