Abstract
view Abstract Citations (15) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations at 1.4 GHz in the Milky Way between Longitude 330 degrees and 340 degrees Cersosimo, J. C. Abstract 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. Publication: The Astrophysical Journal Pub Date: January 1990 DOI: 10.1086/168294 Bibcode: 1990ApJ...349...67C Keywords: Astronomical Spectroscopy; H Ii Regions; Milky Way Galaxy; Astronomical Models; Emission Spectra; Ionized Gases; Recombination Reactions; Star Formation; Astrophysics; GALAXIES: THE GALAXY; INTERSTELLAR: MATTER; INTERSTELLAR: MOLECULES; NEBULAE: H II REGIONS; RADIO SOURCES: LINES full text sources ADS | data products SIMBAD (32)
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