Very Early Phases of Massive Star Formation: An SMA Follow-up of Herschel Hi-Gal Survey Cores

Details Very Early Phases of Massive Star Formation: An SMA Follow-up of Herschel Hi-Gal Survey Cores Very Early Phases of Massive Star Formation: An SMA Follow-up of Herschel Hi-Gal Survey Cores

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725503s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #255.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

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We used the Submillimeter Array (SMA) to observe eight cold, massive ( 1000Msol) dense cores in dark clouds discovered in the Herschel HiGal survey. In contrast to numerous studies of hot molecular cores, very little is known about objects prior to the hot core phase. The SMA results allow us to study systematically the physical and chemical evolution of these dense cores. These protostellar objects were selected because the Hershel SEDs of the dust have temperatures spanning the range between about 10K and 20K, suggestive of different evolutionary phases of very young stars, because the objects were comparatively bright at 250 microns ( 10Jy) and distinct in all five FIR HiGal bands, and because they seemed to be morphologically simple. Only one of the sources is bright enough to be detected at MIPS24; this source, the most mature one, already shows a small outflow in CO. The SMA was used in both compact and very extended configurations, with the 230GHz band. The SMA molecular line maps will be compared with chemical modelling (including dust grain and gas phase reactions) to constrain the physical conditions in these young cores, and their evolutionary stages.

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