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Paper: Imaging Weak Emission Lines in Protostars
Volume: 217, Imaging at Radio Through Submillimeter Wavelengths
Page: 366
Authors: Shah, R. Y.; Wootten, A.
Abstract: Recent observational work using spectra of HCO+, CS, and N2 H+ has uncovered the significance of infall in Class 0 and Class I protostars. Observed infall asymmetries detected in the 85.9 GHz hyperfine transition of {NH2D towards NGC 1333 IRAS4, a well-examined proto-binary system, suggest important consequences for the dynamical and chemical evolution of protostars. We present maps of deutero-ammonia taken with two configurations of the Berkeley-Illinois-Maryland Array, as well as with the NRAO 12-meter telescope towards NGC 1333 IRAS4. Our goal is to understand the distribution of dense gas around IRAS4A and IRAS4B as part of our observing campaign to study protostars with deuterated molecules. The combined interferometer and single-dish measurements allow us to not only analyze the mass infall in IRAS4, but also probe its chemical evolution. Both ion-molecule and surface chemistry enhance deuterium fractionation in the ISM. A high spatial resolution examination of the distribution of deutero-ammonia to ammonia will help us understand the relative importance of the known enhancement pathways.
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