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Titolo:
An XMM-Newton observation of the extreme narrow-line Seyfert 1 galaxy Mrk 359
Autore:
OBrien, PT; Page, K; Reeves, JN; Pounds, K; Turner, MJL; Puchnarewicz, EM;
Indirizzi:
Univ Leicester, Dept Phys & Astron, Xray Astron Grp, Leicester LE1 7RH, Leics, England Univ Leicester Leicester Leics England LE1 7RH er LE1 7RH, Leics, England Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England Univ Coll London Dorking Surrey England RH5 6NT RH5 6NT, Surrey, England
Titolo Testata:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
fascicolo: 4, volume: 327, anno: 2001,
pagine: L37 - L41
SICI:
0035-8711(20011111)327:4<L37:AXOOTE>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVE GALACTIC NUCLEI;
Keywords:
accretion, accretion discs; galaxies : active; galaxies : individual : Mrk 359; X-rays : galaxies;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: O'Brien, PT Univ Leicester, Dept Phys & Astron, Xray Astron Grp, LeicesterLE1 7RH, Leics, England Univ Leicester Leicester Leics England LE1 7RH Leics, England
Citazione:
P.T. O'Brien et al., "An XMM-Newton observation of the extreme narrow-line Seyfert 1 galaxy Mrk 359", M NOT R AST, 327(4), 2001, pp. L37-L41

Abstract

We present XMM-Newton observations of Mrk 359, the first narrow-line Seyfert I galaxy (NLS1) discovered. Even among NLS1s, Mrk 359 is an extreme casewith 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 (2-10)keV continuum, including reflection, is flatter than that of the typical NLS1, with Gamma approximate to1.84. A strong emission line of equivalent width approximate to 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 approximate to 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 otherlow-moderate luminosity Seyfert I galaxies with those in QSOs suggests that the solid angle subtended by the distant reprocessing gas decreases with increasing active galactic nucleus luminosity.

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Documento generato il 18/09/20 alle ore 11:06:29