Extended 4.5 micron GLIMPSE Sources: Rapidly Accreting Massive Protostars?

Details Extended 4.5 micron GLIMPSE Sources: Rapidly Accreting Massive Protostars? Extended 4.5 micron GLIMPSE Sources: Rapidly Accreting Massive Protostars?

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50130c&link_type=abstract

Spitzer Proposal ID #50130

Computer Science

Scientific paper

We propose to obtain spectral line images, using Spitzer/IRS, toward 11 of 300+ cataloged extended 4.5?m excess sources from the GLIMPSE survey. They are believed to be massive protostars in the earliest stages of rapid accretion accompanied by powerful bipolar outflows. If so, they may represent the earliest stage of massive star formation yet observationally identified, well before their final mass is reached. At present, this is mostly conjecture based on mid-IR spectral energy distributions and associations with massive star formation tracers such as radio masers, location in infrared dark clouds, and HII regions. Infrared spectra are required to establish the nature of these intriguing objects. IRS spectra will permit us to probe the ionization distribution around the central protostar, the shocked gas produced by outflows crashing into the ambient ISM, the PDR associated with the objects, and the properties of the infrared dark clouds in which they are embedded. The objects are small, typically ?20? in extent, and can be imaged in spectral lines with a redundancy of 4 in less than one hour/source. Imaging 10-12 objects is necessary to establish mean properties and their dispersion for this class of objects. The IRS data will be supplemented by sensitive, high resolution radio continuum and molecular line observations from CARMA and the VLA that will provide data on associated molecular gas properties, thermal dust emission, and free-free emission from ionized gas.

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