Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pazh...10..912k&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 10, Dec. 1984, p. 912-917) Soviet Astronomy Letters (ISSN 0360-0327), vol. 10, Nov.-Dec
Astronomy and Astrophysics
Astronomy
3
Astronomical Spectroscopy, Carbon, Line Spectra, Nebulae, Radio Astronomy, Absorption Spectra, Decametric Waves, Doppler Effect, Milky Way Galaxy, Resonance Lines
Scientific paper
Observations of the 25-MHz C-recombination absorption lines C638(alpha)-C641(alpha) toward l = 75 deg b = 0 deg in the Galaxy and toward NGC 2024, obtained using the north-south antenna of the Ukrainian UKR-2 radio telescope with beam size 30 arcmin x 15 deg and resolution 1.4 kHz during summer 1983, are reported. The data are presented graphically and analyzed with reference to hydrogenic and low-temperature dielectronic models of recombination. In the Galaxy field, a dielectronic model of recombination in a large region with Te = 50-100 K, Ne = 0.01-0.001/cu cm, effective scale 20-2 pc, hydrogen-atom number density 3-30/cu cm, and C ionization by diffuse Galactic UV radiation is found to be consistent with the observations. Near NGC 2024, the observations correspond best to the extended C II region identified by Kurtz et al. (1983) at 157 microns, with Ne = 0.3/cu cm, Te = 100 K, and effective scale 1 pc.
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