UNSPECIFIED. (2004) Iron line spectroscopy of NGC 4593 with XMM-Newton: where is the black hole accretion disc? MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 352 (1). pp. 205-210. ISSN 0035-8711

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Abstract

We present an analysis of the 2-10 keV XMM-Newton/EPIC-pn spectrum of the Seyfert-1 galaxy NGC 4593. Apart from the presence of two narrow emission lines corresponding to the K lines of cold and hydrogen-like iron, this spectrum possesses a power-law form to within similar to3-5 per cent. There is a marked lack of spectral features from the relativistic regions of the black hole accretion disc. We show that the data are, however, consistent with the presence of a radiatively efficient accretion disc extending right down to the radius of marginal stability if it possesses low iron abundance, an appropriately ionized surface, a very high inclination, or a very centrally concentrated emission pattern (as has been observed during the deep minimum state of the Seyfert galaxy MCG-6-30-15). Deeper observations of this source are required in order to validate or reject these models.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Journal or Publication Title:	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Publisher:	BLACKWELL PUBLISHING LTD
ISSN:	0035-8711
Date:	21 July 2004
Volume:	352
Number:	1
Number of Pages:	6
Page Range:	pp. 205-210
Identification Number:	10.1111/j.1365-2966.2004.07909.x
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/8242

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