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Preprint typeset using L ATEX style emulateapj v. 14/09/00 CAUGHT IN THE ACT: THE ONSET OF MASSIVE STAR FORMATION

By H. Beuther, T. K. Sridharan and M. Saito

Abstract

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 ∼184M ⊙ gas core with a projected size of ∼28000AU that has no associated protostellar mid-infrared counterpart. However, the detection of 4.5µm 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 mm 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 which could be in an evolutionary stage prior to any star formation activity

Year: 2008
OAI identifier: oai:CiteSeerX.psu:10.1.1.317.6088
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