Journal Article

IRAS 13197−1627 has them all: Compton-thin absorption, photoionized gas, thermal plasmas and a broad Fe line*

G. Miniutti, G. Ponti, M. Dadina, M. Cappi and G. Malaguti

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 375, issue 1, pages 227-239
Published in print February 2007 | ISSN: 0035-8711
Published online January 2007 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2006.11291.x
IRAS 13197−1627 has them all: Compton-thin absorption, photoionized gas, thermal plasmas and a broad Fe line*

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We report results from the XMM–Newton observation of IRAS 13197−1627, a luminous infrared (IR) galaxy with a Seyfert 1.8 nucleus. The hard X-ray spectrum is steep (Γ∼ 2.5) and is absorbed by Compton-thin (NH∼ 4 × 1023 cm−2) neutral gas. We detect a Fe Kα emission line at 6.4 keV, consistent with transmission through the absorber. The most striking result of our spectral analysis is the detection of a dominant X-ray reflection component and broad Fe line from the inner accretion disc. The reflection-dominated hard X-ray spectrum is confirmed by the strong Compton hump seen in a previous BeppoSAX observation and could be the sign that most of the primary X-rays are radiated from a compact corona (or base of the jet) within a few gravitational radii from the black hole. We also detect a relatively strong absorption line at 6.81 keV which, if interpreted as Fe xxv resonant absorption, implies an outflow with velocity ∼5 × 103 km s−1. In the soft energy band, the high-resolution gratings and the CCD-resolution data show the presence of both photoionized gas and thermal plasma emission, the latter being most likely associated with a recent starburst of 15–20 M yr−1.

Keywords: galaxies: active; galaxies: individual: IRAS 13197−1627; galaxies: individual: MCG-03-34-64; X-rays: galaxies

Journal Article.  11163 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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