NOAO >   Observing Info >   Approved Programs >   2006A-0213

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Proposal Information for 2006A-0213


PI: Robert Blum, NOAO, rblum@ctio.noao.edu
Address: CTIO, Casilla 603, La Serena, Chile

CoI: Elysandra Figueredo, University of Sao Paulo
CoI: Peter Conti, JILA, University of Colorado
CoI: Augusto Damineli, University of University of Sao Paulo

Title: A Near Infrared Investigation of Galactic Giant H II Regions: Quantifying the Global Lyman Continuum Output of the Milky Way

Abstract: We propose to continue our near infrared investigation of optically obscured Galactic giant HII regions (GHII), aimed at tracing the spiral structure of our Galaxy. Our distance determinations are based upon spectroscopic parallaxes of newly born OB stars. Current radio recombination line+rotation models suffer from the classic near-far ambiguity which our method resolves. Our initial results (along with those of other investigators) show even the near distances are typically overestimated. This means the global Lyman continuum output (and hence star formation rate) is overestimated as well. Our proposal will definitively place the Galactic GHII regions in the Galaxy, accurately tracing its spiral structure and firmly quantifying the global output from these massive star forming regions. We propose here to finish our J, H, and K imaging of GHII regions on the Blanco 4m and continue our spectroscopic followup on the clusters with imaging already in hand on Gemini South with GNIRS. The latter will more than double the number of GHII regions with well determined distances.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2006A-0213

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