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Abstract
view Abstract Citations (14) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radio Recombination Lines and Dark Nebulae Gordon, M. A. Abstract An unsuccessful search for the 1 65a and 1 66a radio recombination lines provides upper limits of 6 x 10- cm6 pc for the emission measures of H+, He+, C+, H2+, and H3+ in four dark nebulae having photographic absorptions from 1 to 5 mag. These results limit the net ionization rate of hydrogen to be less than 0.7 x 10-15 in these dark clouds. Subject headings: excitation and ionization - interstellar matter - nebulae - radio lines Publication: The Astrophysical Journal Pub Date: August 1973 DOI: 10.1086/152306 Bibcode: 1973ApJ...184...77G full text sources ADS |
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