Journal Article

X-ray absorption by broad-line region clouds in Mrk 766

G. Risaliti, E. Nardini, M. Salvati, M. Elvis, G. Fabbiano, R. Maiolino, P. Pietrini and G. Torricelli-Ciamponi

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 2, pages 1027-1035
Published in print January 2011 | ISSN: 0035-8711
Published online December 2010 | e-ISSN: 1365-2966 | DOI:
X-ray absorption by broad-line region clouds in Mrk 766

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We present a new analysis of a 9-d long XMM–Newton monitoring of the narrow-line Seyfert 1 galaxy Mrk 766. We show that the strong changes in the spectral shape, which occurred during this observation, can be interpreted as due to broad-line region clouds crossing the line of sight to the X-ray source. Within the occultation scenario, the spectral and temporal analyses of the eclipses provide precise estimates of the geometrical structure, location and physical properties of the absorbing clouds. In particular, we show that these clouds have cores with column densities of at least a few 1023 cm−2 and velocities in the plane of the sky of the order of thousands of km s−1. The three different eclipses monitored by XMM–Newton suggest a broad range in cloud velocities (by a factor of ∼4–5). Moreover, two iron absorption lines clearly associated with each eclipse suggest the presence of highly ionized gas around the obscuring clouds and an outflow component of the velocity spanning from 3000 to 15 000 km s−1.

Keywords: galaxies: individual: Mrk 766

Journal Article.  7209 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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