The origin of N III lambda 990 and C III lambda 977 emission in AGN narrow-line region gas

Details The origin of N III lambda 990 and C III lambda 977 emission in AGN narrow-line region gas The origin of N III lambda 990 and C III lambda 977 emission in AGN narrow-line region gas

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...438l..55f&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 438, no. 2, p. L55-L58

Astronomy and Astrophysics

Astronomy

20

Astronomical Models, Gas Dynamics, Mathematical Models, Outgassing, Photoionization, Quasars, Seyfert Galaxies, Ultraviolet Astronomy, C Band, Chemical Evolution, Continuum Mechanics, Cosmology, Line Spectra, Space Observations (From Earth)

Scientific paper

We discuss implications of Hopkins Ultraviolet Telescope (HUT) detections of C III lambda 977 and N III lambda 990 emission from the narrow-line region of the Seyfert 2 galaxy NGC 1068. In their discovery paper Kriss et al. showed that the 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 of 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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