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Title: Exploring the complex X-ray spectrum of NGC 4051
Authors: Pounds, Kenneth A.
Reeves, J.N.
King, Andrew R.
Page, Kim L.
First Published: May-2004
Publisher: Blackwell
Citation: Monthly Notices of the Royal Astronomical Society, 2004, 350, pp.10-20
Abstract: Archival XMM–Newton data on the nearby Seyfert galaxy NGC 4051, taken in relatively high- and low-flux states, offer a unique opportunity to explore the complexity of its X-ray spectrum. We find the hard X-ray band to be significantly affected by reflection from cold matter, which can also explain a non-varying, narrow Fe K fluorescent line. We interpret major differences between the high- and low-flux hard X-ray spectra in terms of the varying ionization (opacity) of a substantial column of outflowing gas. An emission-line spectrum in the low-flux state indicates an extended region of photoionized gas. A high-velocity, highly ionized outflow seen in the high-flux state spectrum can replenish the gas in the extended emission region over 103 yr, while having sufficient kinetic energy to contribute significantly to the hard X-ray continuum.
DOI Link: 10.1111/j.1365-2966.2004.07639.x
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher PDF
Status: Peer-reviewed
Type: Article
Rights: © 2004 Royal Astronomical Society (RAS). Deposited with reference to the publisher's policy available on the journal's website.
Description: The definitive version is available at
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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