Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50730j&link_type=abstract
Spitzer Proposal ID #50730
Other
Scientific paper
Ample observational evidence suggests that Infrared Dark Clouds (IRDCs) host the very earliest phases in the formation of both high-mass stars and star clusters. Our multi-wavelength studies show that all IRDCs contain compact cores, and that about 1/3 of these cores show unambiguous signs of star formation. These `active' IRDC cores have slightly extended regions of enhanced 4.5 micron emission in GLIMPSE images. Bright, compact MIPSGAL 24 micron emission is also coincident with these active IRDC cores, indicating the presence of an embedded protostar. However, because of the limited sensitivity of the GLIMPSE and MIPSGAL surveys, these data only reveal the most massive protostars within the IRDCs and are insufficient to reveal any low- or intermediate-mass protostars that are expected within young clusters. While many IRDCs are sufficiently massive to form numerous protostars in a young cluster, their protostellar activity varies considerably. We now request Spitzer IRAC/MIPS time to achieve unprecedented sensitivity toward two massive IRDCs (one containing many protostars, the other containing few) in order to probe the fainter end of their embedded protostellar population. These data will reveal any lower-mass protostars that may exist within these IRDCs and, thus, reveal the mass distribution and evolutionary stage of the embeded cluster.
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