Abstract
view Abstract Citations (23) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radio Recombination Lines at a Wavelength of 78 Centimeters Gordon, Kurtiss J. ; Gordon, Courtney P. ; Lockman, Felix J. Abstract Galactic H ii regions and supernova remnants were observed in the 257a and 323 recombination lines near 386 MHz (A 78 cm) with the NRAO 300-foot (91-m) telescope. The H257a line was found in M17, W43 (both +45 and +98 km 1 features), W51 (G49.0 -0.2), and the North America and Rosette nebulae. In addition, W51 displays C 257a. The p transition was not detected in any source. Line emission from the diffuse interstellar medium may be important at this frequency, apparently contributing to the H 257a profile toward M17, and possibly, toward W43 and W51. Except for M17, the line widths and velocities calculated from our data are consistent with measurements taken at higher frequencies. Subject headings: interstellar matter - nebulae - radio lines Publication: The Astrophysical Journal Pub Date: September 1974 DOI: 10.1086/153063 Bibcode: 1974ApJ...192..337G full text sources ADS |
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