1988•Publications of the Astronomical Society of JapanRequires access
Continuum Observation of Sagittarius B2 at 23 and 43 GHz
Kenji Akabane, Yoshiaki Sofue, H. Hirabayashi, Masaki Morimoto, Makoto Inoue, Dennis Downes
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Abstract
Abstract The source Sgr B2 has been mapped with a single-dish resolution of ~ 40″ at frequencies of 23 GHz and 43 GHz (λ = 1.3 cm and 6.9 mm respectively). An extended thermal component was found, and has been compared with that in lower frequency observations. The core region of Sgr B2 (containing the compact sources MD4 and MD5) was resolved at both 23 GHz and 43 GHz. The compact components MD4 and MD5 have complex thermal spectra which may indicate inhomogeneities within each compact core. A new source, G0.64–0.06, was found in the southern area of the extended thermal component. The 43-GHz map made with the Nobeyama 45-m telescope was also convolved to an angular resolution of 1′.3, for comparison with a 10.7-GHz map made with the Effelsberg 100-m telescope. This comparison suggests that there may be some nonthermal emission in the southern area of Sgr B2.