Spectral Line Survey toward RCrA IRS7B in the 345 GHz Window with ASTE

Details Spectral Line Survey toward RCrA IRS7B in the 345 GHz Window with ASTE Spectral Line Survey toward RCrA IRS7B in the 345 GHz Window with ASTE

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.382w&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

Astronomy and Astrophysics

Astronomy

Scientific paper

Recently, it has been pointed out that the chemical composition in the low-mass protostars varies from source to source. Two extreme cases are the hot corinos where various complex organic molecules are abundant, and the WCCC (Warm Carbon-Chain Chemistry) sources where carbon-chain molecules are abundant. Understanding an origin of such chemical diversity is an important target for astrochemistry. We have conducted a spectral line survey in the 332 - 364 GHz band (figure 1) with ASTE toward a low mass class 0 protostar in the Corona Australis (R CrA IRS7B), which have been recognized as a hot corino candidate because of its bright emissions of H_2CO and CH_3OH. We have also performed a supplementary observations in the 450 GHz band. In total, 16 molecular species including CO, CS, CN, NO, CCH, c-C3H2, HCO+, H2CO and CH3OH are identified. Strong emissions of CN, and CCH are observed, whereas, complex organic molecules and long carbon-chain molecules were not detected. The rotation temperature of CH3OH is evaluated to be ˜ 16 K, which is much lower than that in the typical hot corino IRAS 16293-2422 (˜85 K). The deuterium fractionation ratio for CCH and H2CO are obtained to be 0.06-0.01, which are an order of magnitude lower than that found in the hot corino. Furthermore c-C3H2, whose production pathway is related to carbon-chain molecules, is abundant, and its rotation temperature is similar to that of CH3OH. From these results, it is likely that the RCrA IRS7B is a borderline source between the hot corinos and the WCCC sources. A related survey in the 230 GHz band is in progress for full characterization of the chemical composition of this low-mass protostellar source (Lindberg et al. 2011).

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