Physics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50039w&link_type=abstract
Spitzer Proposal ID #50039
Physics
Scientific paper
There is much current interest in identifying dense cores and globules prior to or close to the onset of low-mass star formation. We propose the first Spitzer observations of DC 314.8-5.1, an isolated, optically-opaque globule that promises to be an excellent test of physical conditions and dust properties in such regions. The distance to the globule - and hence parameters that depend on distance - are well constrained by its serendipitous association with a B-type field star. This circumstance also provides an opportunity to study the interaction of the globule with the UV flux from the B-type star. We propose a coordinated suite of IRAC, MIPS and IRS observations designed to probe the physics and chemistry of interstellar material in the globule and resolve the question of whether there is significant current star formation. IRAC and MIPS images will be used to extend to longer wavelengths an existing 2MASS survey of the stellar content of the region, providing reliable discrimination between young stellar objects and reddened background stars. IRS pointed and mapping observations will be used to detect and study PAH emission features in the reflection nebula surrounding the embedded star, the relative strengths of which constrain the ionization state of the carrier molecules. High resolution IRS staring mode observations will also be obtained to search for CO2 ice absorption at 15 microns toward two point sources with high extinction. Results will enable us to compare physical conditions and dust properties in this isolated globule with those prevailing in prototypical dense environments, including cores within dark clouds (e.g. Taurus), and reflection nebulae illuminated by embedded YSOs (e.g. NGC 7023).
Cook Amanda
Shenoy Sachindev
Whittet Douglas
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