XMM-Newton view of the double-peaked Fe K-alpha complex in E1821+643

Details XMM-Newton view of the double-peaked Fe K-alpha complex in E1821+643 XMM-Newton view of the double-peaked Fe K-alpha complex in E1821+643

2006-10-09

arxiv.org/abs/astro-ph/0610233v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A, 7 pages and 7 figures

Scientific paper

10.1051/0004-6361:20065566

We present the results of the analysis of the hard band XMM-Newton spectra of the luminous, L(2-10keV)~3.4E+45 erg/s, radio-quiet quasar, E1821+643. Two emission features were observed in the 6-7 keV rest frame band, confirming previous Chandra detection of these structures. We interpret these features as two single emission lines, one consistent with the neutral Fe K-alpha line at 6.4 keV and the other most likely due to FeXXVI. If related to the quasar, the high-energy emission line should originate in highly ionised matter, i.e. the accretion disc or the clouds of the emission line regions. Alternatively, it may be related to the intergalactic medium of the rich galaxy cluster in which E1821+643 is embedded. A composite broad emission line in combination with an absorption line model, however, also fits the data well. We discuss the possible physical interpretations of the origin of these features.

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