Observations of Complex Molecules in Hot Molecular Cores

Details Observations of Complex Molecules in Hot Molecular Cores Observations of Complex Molecules in Hot Molecular Cores

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713201l&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #132.01; Bulletin of the American Astronomical Society, Vol. 33, p.716

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Results from observations of molecular emission of complex species in hot molecular cores are presented. Complex and highly saturated molecules are often found exclusively with high abundances in hot molecular cores (HMCs), dense (n(H2) > 106 cm-3) and warm (Tk > 100K) molecular condensations. Usually associated with molecular masers, HII regions, and/or embedded near-infrared sources, HMCs are suggested to be in the earliest phases of the massive star formation process. Observations by single-element telescopes have identified a growing number of hot core sources toward galactic HII regions, including G9.62+0.19, G10.47+0.03, G29.96-0.02, G31.41+0.31, and G75.78+0.34. To locate the complex molecular emission and to investigate their association with dust continuum sources and HII regions, we carried out interferometric observations toward these sources with the OVRO Millimeter Array. C2H5CN, a major N-bearing molecule, was detected toward all but G75.78+0.34. The emission cores are compact or marginally resolved and coincide with the dust/CH3CN cores. CH3OH is a representative O-bearing molecule and its emission is usually dominated by a hot core component. However, CH3OH emission may also trace outflow activities as well as contain weak maser features. Observations of molecules of potential biological interest, HCOOH and HCOOCH3, were carried out toward G10.47+0.07 and G31.41+0.31. The association between the HCOOH/HCOOCH3 emission and the CH3OH emission in hot cores is consistent with the scenario that grain surface chemistry plus mantle evaporation processes are responsible for the formation of these species.

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