Detection of the N II 122 and 205 micron lines - Densities in G333.6-0.2

Details Detection of the N II 122 and 205 micron lines - Densities in G333.6-0.2 Detection of the N II 122 and 205 micron lines - Densities in G333.6-0.2

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413..237c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 1, p. 237-241.

Astronomy and Astrophysics

Astronomy

39

H Ii Regions, Infrared Astronomy, Interstellar Gas, Line Spectra, Nitrogen, Space Density, Electron Density Profiles, Gas Density

Scientific paper

Measurements of the G333.6-0.2 H II region which include the first detection of the N II 122 micron forbidden line in an astronomical force and the first measurement of the N II 205 micron forbidden line in a discrete source are presented. Also considered are fine structure lines of forbidden S III, forbidden Fe III, forbidden Si II, forbidden Ne III, forbidden O III, forbidden N III, forbidden O I, and forbidden C II from 19 to 206 microns. It is concluded that the N II 122 and 205 microns forbidden line pair in a discrete astronomical source was detected for the first time. The emission in transitions is produced largely by low-ioninzation, low-density material not easily probed by other lines. Other FIR line pairs generally originate in higher density regions closer to the exciting force.

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