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An extended XMM-Newton observation of the Seyfert galaxy NGC 4051 II. Soft X-ray emission from a limb-brightened shell of post-shock gas

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journal contribution
posted on 08.02.2016, 11:43 by Kenneth Alwyne Pounds, Simon Vaughan
An extended XMM–Newton observation of the Seyfert 1 galaxy NGC 4051 in 2009 revealed a complex absorption spectrum, with a wide range of outflow velocities and ionization states. The main velocity and ionization structure was interpreted in Paper I in terms of a decelerating, recombining flow resulting from the shocking of a still higher velocity wind colliding with the interstellar medium or slower moving ejecta. The high sensitivity of the XMM–Newton observation also revealed a number of broad emission lines, all showing evidence of self-absorption near the line cores. The line profiles are found here to be consistent with emission from a limb-brightened shell of post-shock gas building up ahead of the contact discontinuity. While the broad emission lines remain quasi-constant as the continuum flux changes by an order of magnitude, recombination continua of several H- and He-like ions are found to vary in response to the continuum, providing an important key to scaling the ionized flow.

History

Citation

Monthly Notices of the Royal Astronomical Society, 2011, 415, pp. 2379-2389 (11)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Wiley-Blackwell

issn

0035-8711

eissn

1365-2966

Acceptance date

06/02/2011

Copyright date

2011

Available date

08/02/2016

Publisher version

http://mnras.oxfordjournals.org/content/415/3/2379

Language

en