O'Brien, PT;
Page, K;
Reeves, JN;
Pounds, KA;
Turner, MJL;
Nayakshin, S;
PUCHNAREWICZ, EM;
(2001)
An XMM-Newton observation of the extreme narrow-line Seyfert 1 galaxy, Mrk359.
Monthly Notices of the Royal Astronomical Society
, 327
(4)
L37 - L41.
10.1046/j.1365-8711.2001.05008.x.
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Abstract
We present XMM-Newton observations of Mrk 359, the first narrow-line Seyfert 1 galaxy (NLS1) discovered. Even among NLS1s, Mrk 359 is an extreme case with extraordinarily narrow optical emission lines. The XMM-Newton data show that Mrk 359 has a significant soft X-ray excess which displays only weak absorption and emission features. The continuum, including reflection, is flatter than that of the typical NLS1, with . A strong emission line of equivalent width ≈200 eV is also observed, centred near 6.4 keV. We fit this emission with two line components of approximately equal strength: a broad iron line from an accretion disc and a narrow, unresolved core. The unresolved line core has an equivalent width of ≈120 eV and is consistent with fluorescence from neutral iron in distant reprocessing gas, possibly in the form of a ‘molecular torus’. Comparison of the narrow-line strengths in Mrk 359 and other low–moderate luminosity Seyfert 1 galaxies with those in QSOs suggests that the solid angle subtended by the distant reprocessing gas decreases with increasing active galactic nucleus luminosity.
Type: | Article |
---|---|
Title: | An XMM-Newton observation of the extreme narrow-line Seyfert 1 galaxy, Mrk359 |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1046/j.1365-8711.2001.05008.x |
Publisher version: | http://dx.doi.org/10.1046/j.1365-8711.2001.05008.x |
Language: | English |
Additional information: | © 2001 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org |
Keywords: | Galaxies, Observation |
UCL classification: | UCL |
URI: | https://discovery.ucl.ac.uk/id/eprint/187851 |
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