Subarcsecond Resolution Observations of Sagittarius B2 at 85 GHZ

Details Subarcsecond Resolution Observations of Sagittarius B2 at 85 GHZ Subarcsecond Resolution Observations of Sagittarius B2 at 85 GHZ

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...523..683l&link_type=abstract

The Astrophysical Journal, Volume 523, Issue 2, pp. 683-689.

Astronomy and Astrophysics

Astronomy

31

Ism: Dust, Extinction, Ism: Abundances, Ism: Individual (Sagittarius B2), Ism: Molecules, Radio Lines: Ism

Scientific paper

We present 3 mm continuum and spectral line observations of vinyl cyanide (C_2H_3CN) and ethyl cyanide (C_2H_5CN) toward the Sgr B2 region carried out by the BIMA Array at subarcsecond resolution. These are the highest angular resolution observations ever reported for C_2H_3CN and C_2H_5CN. With an angular resolution of 0.8", we were able to probe physical scales only one-tenth the size of the Oort cloud. Toward Sgr B2(N-LMH), the continuum emission is dominated by the K2 source, where dust emission contributes more than 60% of the 3 mm flux. The C_2H_3CN and C_2H_5CN emission reveals outflows in the dense molecular gas around K2, while C_2H_5CN exists in the ambient component as well. The distribution difference appears to indicate that C_2H_5CN is processed into C_2H_3CN in shock regions presumably caused by outflows. Column densities of C_2H_3CN and C_2H_5CN are found to be at least 3 times higher than previously reported. Inferred high H_2, C_2H_3CN, and C_2H_5CN column densities indicate that K2 can be the heating source for dust mantle evaporation at Sgr B2(N-LMH), the primary site of complex molecules.

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