Chemical Imaging of Molecular Clouds and Comets with the FCRAO 14m Telescope

Details Chemical Imaging of Molecular Clouds and Comets with the FCRAO 14m Telescope Chemical Imaging of Molecular Clouds and Comets with the FCRAO 14m Telescope

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999alma.confe..54s&link_type=abstract

Science with the Atacama Large Millimeter Array (ALMA), Associated Universities, Inc., held October 6-8, 1999 at Carnegie Instit

Physics

Focal Plane, Array, Receivers, Mapping, Molecular, Cloud, Core, Gmc, Dark, Emission

Scientific paper

Focal plane array receivers enable single dish telescopes to obtain sensitive maps of sources efficiently. In this paper, we summarize results of the detailed mapping of the chemistry of molecular cloud cores and comets with the focal plane array on the FCRAO 14m antenna by a number of investigators. Surveys of the emission from approximately 20 different molecular species have been carried out in GMC cores and dark clouds. The GMC core chemistry is remarkably homogeneous and rather similar from source to source. Time dependent chemical modelling finds good agreement with the observations at early evolutionary stages (t ~ 105 yr) suggesting that the GMC cores are dynamically evolving objects. Surveys of dark cloud cores have revealed significant abundance variations within the sources. The pattern of variations is best explained by small differences in the chemical evolutionary age within the source, with a typical value for the entire cloud also in the vicinity of ~105 years. Images of the molecular emission from comets provide important clues about the physical processes and chemistry of the cometary coma. Chemical models reveal that HCO+ is created in the coma via ion-molecule chemistry; its detailed distribution reflects its interaction with the solar wind and provides important tests of MHD models of these effects.

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