Journal Article

Reflection-dominated X-ray spectra of narrow-line Seyfert 1 galaxies: Mrk 478 and EXO 1346.2+2645

A. Zoghbi, A. C. Fabian and L. C. Gallo

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 4, pages 2003-2008
Published in print December 2008 | ISSN: 0035-8711
Published online December 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14078.x
Reflection-dominated X-ray spectra of narrow-line Seyfert 1 galaxies: Mrk 478 and EXO 1346.2+2645

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Multi-epoch XMM–Newton spectra of the two narrow-line Seyfert 1 (NLS1), Mrk 478 and EXO 1346.2+2645, are presented. The data were fitted with different models, including the relativistically blurred reflection model reflionx, which was found to give a good description of both spectra in all epochs. The two sources are reflection dominated with the illuminating continuum hidden from view. This can be explained in terms of either a corrugated disc or strong gravitational light bending effects. The emission from these two sources comes from a very small region (a few gravitational radii), very close to a rapidly spinning black hole. Spectral variability analysis shows that both sources have constant rms spectra, and constant hardness ratios in all epochs, in agreement with a single spectral component. The constancy spectrum between high and low states rules out alternative models such as partial covering.

Keywords: galaxies: active; galaxies: individual: Mrk 478; galaxies: individual: EXO 1346.2+2645; galaxies: nuclei; galaxies: Seyfert; X-rays: galaxies

Journal Article.  3973 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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