Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40230r&link_type=abstract
Spitzer Proposal ID #40230
Computer Science
Scientific paper
The coexistence between extreme environmental conditions (high density, turbulence, magnetic field strengths, and tidal shear) and young massive stars in the Galactic Center has led to one unsolved question: how do stars form in a region which appears to be quite hostile to star birth? Within the central 200 pc, almost all stages of the stellar life cycle have been identified: molecular clouds, HII regions (including compact HII regions), young massive stars, supernova remnants, old red giant and AGB stars. An important class of objects which has yet to be conclusively established and therefore has not been studied, is massive young stellar objects (YSOs). One hundred and seven (107) massive YSO candidates have been identified by Spitzer/IRAC observations in the central 2.0 by 1.4 degrees (280 x 210 pc) of our Galaxy. We propose to observe this sample using the IRS to determine the evolutionary status of these objects. The presence or absence of forbidden emission lines, ice features, and molecular absorptions will determine if these objects are indeed massive YSOs or evolved AGB stars (YSOs and AGB stars have similar IRAC colors). The IRS spectra will be used to constrain the models of the YSOs,which will provide estimates of their stellar masses. The main goal of the study is to determine the distribution of YSOs in the Galactic Center, their correlation with known clusters, ionized gas, molecular gas and photodissociation regions, and their mass distribution. These results will characterize a stellar population that has been undetected before in the central regions of our Galaxy and provide unique knowledge about the early stages of star formation processes occurring in the Galactic Center.
Arendt Richard
Cotera Angela
Ramirez Solange S.
Robitaille Thomas
Schultheis Mathias
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