A Young Stellar and Protostellar Census of Galactic Ultracompact HII Regions -- Exploring Massive Star Formation with MIPS and IRAC

Details A Young Stellar and Protostellar Census of Galactic Ultracompact HII Regions -- Exploring Massive Star Formation with MIPS and IRAC A Young Stellar and Protostellar Census of Galactic Ultracompact HII Regions -- Exploring Massive Star Formation with MIPS and IRAC

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20778c&link_type=abstract

Spitzer Proposal ID #20778

Computer Science

Scientific paper

We will map regions around 41 ultracompact HII (UCHII) regions from the radio selected Midcourse Space Experiment (MSX) sample of Crowther & Conti (2003) using IRAC and MIPS to (i) determine their embedded source contents; (ii) the multiplicity of high mass star formation and (iii) estimate the initial mass function of the sample. Our sample spans a range of UCHII morphology and Galactic environment. The proposed observations will detect all massive star formation ongoing in these objects and permit robust determination of the number of stars powering each UCHII, in contrast with previous mid-IR observations which were poorly spatially matched with radio observations. Deep imaging with IRAC will look for molecular line emission associated with shocked massive outflows, and MIPS observations will be critical to detect the earliest and most massive protostars and to construct the spectral energy distributions of the protostars. The data will be used to examine various theories of massive star formation and to examine the role of triggered star formation in these early massive objects.

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