Journal Article

Broad iron L line and X-ray reverberation in 1H0707-495

A. Zoghbi, A. C. Fabian, P. Uttley, G. Miniutti, L. C. Gallo, C. S. Reynolds, J. M. Miller and G. Ponti

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 401, issue 4, pages 2419-2432
Published in print February 2010 | ISSN: 0035-8711
Published online January 2010 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2009.15816.x
Broad iron L line and X-ray reverberation in 1H0707-495

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A detailed analysis of a long XMM–Newton observation of the narrow-line type 1 Seyfert galaxy 1H0707-495 is presented, including spectral fitting, spectral variability and timing studies. The two main features in the spectrum are the drop at ∼7 keV and a complex excess below 1 keV. These are well described by two broad, K and L, iron lines. Alternative models based on absorption, although they may fit the high-energy drop, cannot account for the 1 keV complexity and the spectrum as a whole. Spectral variability shows that the spectrum is composed of at least two components, which are interpreted as a power law dominating between 1–4 keV and a reflection component outside this range. The high count rate at the iron L energies has enabled us to measure a significant soft lag of ∼30 s between 0.3–1 and 1–4 keV, meaning that the direct hard emission leads the reflected emissions. We interpret the lag as a reverberation signal originating within a few gravitational radii of the black hole.

Keywords: galaxies: active; galaxies: individual: 1H0707-495; galaxies: nuclei; galaxies: Seyfert; X-rays: galaxies

Journal Article.  11524 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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