NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T13:18:17 PDT
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For refcode 1996ApJ...457..111W:
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1996ApJ...457..111W RELATIONS BETWEEN THE OPTICAL Fe II EMISSION AND ULTRAVIOLET SPECTRA IN ACTIVE GALACTIC NUCLEI TING-GUI WANG, YOU-YUAN ZHOU, AND AN-SONG GAO Received 1993 November 29; accepted 1995 July 25 ABSTRACT Optical Fe II emission is a general characteristic of most active galactic nuclei, but the physical conditions in the Fe II-emitting region are not yet understood. The current photoionization models underpredict the total Fe II intensity as well as optical Fe II/H{beta} ratio. In this paper, we report the results of a statistical analysis of the relation between the optical Fe II strength from the literature and the UV spectra from IUE. We find that Fe II/H{beta} is strongly correlated with I({lambda}1400)/I(C IV) and I(C IV)/I(Ly{alpha}). The equivalent widths of optical Fe II and C IV are significantly anticorrelated. While no firm conclusions have been reached, the Fe II strength might be expected to be influenced by (1) the inclination of the accretion disk, (2) the spectrum of the ionizing continuum, and (3) the volume and column densities of the emission-line gas. Subject headings: galaxies: active - quasars: general - ultraviolet: galaxies
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