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|Title:||Exploring the complex X-ray spectrum of NGC 4051|
|Authors:||Pounds, Kenneth A.|
King, Andrew R.
Page, Kim L.
|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.|
|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 www.blackwell-synergy.com.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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