期刊
ASTROPHYSICAL JOURNAL
卷 795, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/795/2/152
关键词
individual objects (IRAS 15398-3359); molecules
资金
- ADS/JAO.ALMA [2011.0.00777.S]
- Ministry of Education, Culture, Sports, Science, and Technologies of Japan [21224002, 25400223, 25108005]
- Advanced Leading Graduate Course for Photon Science (ALPS)
- Lundbeck Foundation [R52-2010-4810] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [25108005] Funding Source: KAKEN
Subarcsecond (0 ''.5) images of H2CO and CCH line emission have been obtained in the 0.8 mm band toward the low-mass protostar IRAS 15398-3359 in the Lupus 1 cloud as one of the Cycle 0 projects of the Atacama Large Millimeter/Submillimeter Array. We have detected a compact component concentrated in the vicinity of the protostar and a well-collimated outflow cavity extending along the northeast-southwest axis. The inclination angle of the outflow is found to be about 20 degrees, or almost edge-on, based on the kinematic structure of the outflow cavity. This is in contrast to previous suggestions of a more pole-on geometry. The centrally concentrated component is interpreted by use of a model of the infalling rotating envelope with the estimated inclination angle and the mass of the protostar is estimated to be less than 0.09 M-circle dot. Higher spatial resolution data are needed to infer the presence of a rotationally supported disk for this source, hinted at by a weak high-velocity H2CO emission associated with the protostar.
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