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.

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