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 |
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
