NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T08:54:42 PDT
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For refcode 2004MNRAS.352..205R:
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Copyright by Royal Astronomical Society. 2004MNRAS.352..205R Iron line spectroscopy of NGC 4593 with XMM-Newton: where is the black hole accretion disc? Reynolds, Christopher S.; Brenneman, Laura W.; Wilms, Jorn; Kaiser, Mary Elizabeth 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{alpha} lines of cold and hydrogen-like iron, this spectrum possesses a power-law form to within ~3-5 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. Keywords: accretion, accretion discs, black hole physics, galaxies: individual: NGC 4593, galaxies: Seyfert
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