158 micron forbidden C II mapping of NGC 6946 - Probing the atomic medium

Details 158 micron forbidden C II mapping of NGC 6946 - Probing the atomic medium 158 micron forbidden C II mapping of NGC 6946 - Probing the atomic medium

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407..579m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 2, p. 579-587.

Astronomy and Astrophysics

Astrophysics

78

Astronomical Spectroscopy, Emission Spectra, Far Infrared Radiation, Galactic Nuclei, Spiral Galaxies, Astronomical Observatories, Fabry-Perot Interferometers, Interstellar Gas, Molecular Gases, Photoionization

Scientific paper

A well-sampled map (23 x 17 kpc) of the strong 158 micron forbidden C II cooling line in the Scd galaxy NGC 6946 at 55 arcsec resolution is presented which was taken with the MPE/UCB Far-infrared Imaging Fabry-Perot Interferometer (FIFI) in the Kuiper Airborne Observatory. It is concluded that the line emission in NGC 6946 is present in three spatially distinct components including nucleus, spiral arms, and extended region. An extended emission region is a source of most of the forbidden C II luminosity in NGC 6946. The 1 arcmin nuclear component has a line luminosity of 1.5 x 10 exp 7 solar luminosity and contributes 0.15 percent of the galaxy's total FIR luminosity. An extended component of forbidden C II emission is found to exist past the molecular extent of the galaxy and to be present to at least the full dimensions of the map. This component is attributed to a mixture of neutral and atomic clouds.

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