Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20302a&link_type=abstract
Spitzer Proposal ID #20302
Physics
Scientific paper
We propose a dedicated imaging study with both IRAC and MIPS of six nearby prestellar cores spanning a range of environmental conditions. These cores, which have previously been mapped at 7 microns with ISOCAM and/or 1.3mm with the IRAM 30m telescope, are believed to be representative of the initial conditions for protostellar collapse. Some of them apparently feature sharp outer edges, possibly corresponding to a dramatic change in the thermal properties of the gas/dust at the interfaces with the ambient cloud. We expect these starless cores to be seen absorption with IRAC at 3.6-8 microns and MIPS at 24 microns and in emission with MIPS at 160 microns. Our proposed multi-wavelength imaging with Spitzer will allow us to obtain unique constraints on their outer temperature structure and on the physical nature of their apparently sharp interfaces with their parent clouds. The improved resolution of IRAC over ISOCAM will also allow us to probe, for the first time, the small-scale structure of these objects (and possible sub-fragmentation into multiple systems).
Andre' Philippe
Bacmann Aurore
Bouwman Jeroen
Onishi Toshikazu
Peretto Nicolas
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