The Origin of NIII λ990 and CIII λ977 Emission in NGC 1068

Details The Origin of NIII λ990 and CIII λ977 Emission in NGC 1068 The Origin of NIII λ990 and CIII λ977 Emission in NGC 1068

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1812f&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #18.12; Bulletin of the American Astronomical Society, Vol. 26, p.1339

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Scientific paper

We discuss implications of HUT detections of C III λ977 and N III λ990 emission from the Narrow Lined Region (NLR) of the Seyfert 2 galaxy NGC 1068. In their discovery paper Kriss et al. (1992, ApJ, 394, L37) showed that unexpectedly great strength of these lines implies that the emitting gas must be shock heated if the lines are collisionally excited. Here we investigate other processes which excite these lines in photoionization equilibrium. Recombination, mainly dielectronic, and continuum fluorescence, are strong contributors to the line. The resulting intensities are sensitive to the velocity field of the emitting gas, and require that the turbulence be the same order of magnitude as the observed line width. We propose optical observations that will decide whether the gas is collisionally or radiatively heated.

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