Computer Science
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop60078w&link_type=abstract
Spitzer Proposal ID #60078
Computer Science
Scientific paper
NGC 281 (a.k.a. the Pac Man Nebula) is a complex region of star formation. At a distance of about 3 kpc is lies a remarkable 300 pc above the galactic plane. Apparently triggered by a supernova that occurred 6 Myr ago, it includes at least 3 separate but related sites of star formation within 4 pc. The oldest regions includes a trapezium-like set of several 3.5 Myr O stars while the youngest regions are still active. In addition to hundreds of young stars, our recent Chandra observation, revealed copious plasma surrounding the O stars and impacting on at least one of the active regions. We will determine whether the clusters are part of a single, continuous cluster, or whether they are separate clusters created by distinct episodes of star formation - and distinquish between predictions made by 'collect & collapse' or radiation driven implosion models (RDI). The face-on aspect of the region allows us to study the diffuse plasma in the region to understand the role of X-ray ionization along the HII region/molecular cloud interface. We propose to map the region using IRAC in order to study: 1.) The mechanism of the triggered star formation within the embedded clouds. 2.) The relationship between hot plasma and molecular clouds and to look for dust in and around the hot plasma 3.) The disk frequency of massive stars (1-2 Msun) in molecular cloud, in cluster surrounding OB stars, and in the hot plasma.
Christian Damian
Gutermuth Robert
Megeath Thomas S.
Wolk Scott
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