Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...349...67c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 349, Jan. 20, 1990, p. 67-77.
Astronomy and Astrophysics
Astrophysics
14
Astronomical Spectroscopy, H Ii Regions, Milky Way Galaxy, Astronomical Models, Emission Spectra, Ionized Gases, Recombination Reactions, Star Formation
Scientific paper
Observations of recombination lines and continuum emission from 330-340 deg longitude along the Galactic plane at 1.4 GHz are shown. An electron temperature T(e) = 6700 K is determined for the region. A 30 m single-dish antenna is found to be very sensitive to low-density gas with densities of about 10/cu cm at frequencies of 0.6-2.0 MHz. The gas emission in the H166-alpha line is associated with Population I material, but it is not always connected to active star-forming regions. Around l = 335 deg, the recombination lines show evidence of extended interarm ionized gas connecting giant complexes of H II regions situated in Scutum-Crux and Norma arms. An upper limit of 200 K for T(e) and a mean electron density of 0.07/cu cm are obtained for this gas. An extended weak emission with radial velocity of 120 kms/s is found for l = 338-339 deg. It is concluded that this emission comes from a diffuse ionized cloud of 50,000 solar masses located in the 3 kpc expanding arm.
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