The IMF in the Hidden Galactic Starburst W49A

Details The IMF in the Hidden Galactic Starburst W49A The IMF in the Hidden Galactic Starburst W49A

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11168b&link_type=abstract

HST Proposal ID #11168. Cycle 16

Computer Science

Scientific paper

W49A is one of the most luminous and prolific massive star formation regions in the disk of our Milky Way. Given the presence of several very massive OB clusters as well as an unusually high concentration of many young ultra-compact HII regions UCHIIR -- all embedded in about 1 million solar masses of molecular gas -- it is arguably the best Galactic template for a luminous starburst region. We propose to obtain NICMOS imaging of the central part of W49A, covering a strip from the central, massive OB cluster to the ring of UCHIIRs. Our goals are to resolve and characterize the central star cluster and determine its IMF down to about 1 solar mass. We want to characterize the distribution of intermediate-mass YSOs, and identify the NIR counterparts to the UCHIIRs. The combination of the proposed HST/NICMOS data with our recently obtained Spitzer observations would allow a great step forward in the understanding of massive star and cluster formation.;

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