A substellar-mass protostar and its outflow of IRAS 15398-3359 revealed by subarcsecond-resolution observations of H2CO and CCH
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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°, 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 ☉.
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.
Originalsprog | Engelsk |
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Artikelnummer | 152 |
Tidsskrift | Astrophysical Journal |
Vol/bind | 795 |
Udgave nummer | 2 |
Antal sider | 9 |
ISSN | 0004-637X |
DOI | |
Status | Udgivet - 2014 |
ID: 138819299