期刊
ASTROPHYSICAL JOURNAL
卷 634, 期 2, 页码 L185-L188出版社
IOP PUBLISHING LTD
DOI: 10.1086/498867
关键词
stars : early-type; stars : formation; stars : individual (IRDC 18223-3); stars : winds, outflows
Combining mid-infrared data from the Spitzer Space Telescope with cold gas and dust emission observations from the Plateau de Bure Interferometer, we characterize the infrared dark cloud IRDC 18223-3 at high spatial resolution. The millimeter continuum data reveal a massive similar to 184 M, gas core with a projected size of similar to 28,000 AU that has no associated protostellar mid-infrared counterpart. However, the detection of 4.5 mm emission at the edge of the core indicates early outflow activity, which is supported by broad CO and CS spectral line-wing emission. Moreover, systematically increasing N2H+(1-0) line width toward the millimeter core center can be interpreted as additional evidence for early star formation. Furthermore, the N2H+(1-0) line emission reveals a less massive secondary core that could be in an evolutionary stage prior to any star formation activity.
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