Journal
ASTROPHYSICAL JOURNAL
Volume 542, Issue 1, Pages 344-351Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/309501
Keywords
ISM : clouds; ISM : individual (IRAS 18148-0440, L483); ISM : molecules; radio lines : ISM
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We present the aperture synthesis imaging of C3H2 2(12)-1(01) and HCO+ 1-0 lines and of continuum emission at lambda = 3.4 mm toward the class 0 young stellar object IRAS 18148 similar to 0440 in the L483 molecular cloud. The continuum emission is detected at the IRAS position at a level of 16 mJy, indicating a compact source with a mass of similar to0.13 M.. The C3H2 delineates an envelope near the IRAS position, with a size of similar to 3000 AU x 2000 AU in R.A. and decl. directions, respectively. A velocity gradient detected only along the axis of outflow can be explained in terms of free-fall motion of the envelope. The HCO+ line wing extends up to the velocity of +/-6 km s(-1) relative to the systemic one, and the high-velocity material shows a symmetric bipolarity and extends over 2' or 0.1 pc along the east-west direction. It is found that the outflow material is clumpy and the opening angle is widest for the slowest moving component. The core component of the HCO+ 1-0 line exhibits an anti-infall asymmetry not only in interferometric but also in single dish observations. It is attributable to the slow isotropic outward motion of gas between the flattened envelope and the collimated outflow.
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