Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40791m&link_type=abstract
Spitzer Proposal ID #40791
Computer Science
Scientific paper
GLIMPSE and GLIMPSE2 have surveyed a large fraction of the Milky Way's star formation, as evidenced by the IRAS distribution of Galactic 25um flux, but at least two significant regions of star formation lie beyond the GLIMPSE survey area. Omission of these regions from GLIMPSE leaves a critical gap in the Spitzer legacy in the area of star formation in the outer, lower metallicity disk. Here we propose to extend GLIMPSE-style coverage to galactic longitudes 255 < l < 295 to cover 86 square degrees of the Carina and Vela regions of the Galactic plane. In addition to largely completing the characterization of mid-plane Galactic star formation by extending GLIMPSE to regions at and beyond the Solar circle, this 120-hour IRAC survey will probe the stellar distribution in the Sagittarius and Perseus arms and beyond. Using a technique we have developed to ascertain reddening estimates to individual stars from combined Spitzer and 2MASS photometry and to produce reliable color-magnitude diagrams and photometric parallax distances of useful stellar population tracers, we will reconstruct the 3-D distribution of stars in and between these spiral arms, the 3-D distribution of the Galactic stellar warp and the disrupted dwarf galaxy, Argo, that lies behind, and the 3-D distribution of extinction in these directions. Given the close relationship between extinction and J=1 -> 0 CO emission, knowledge of the space distribution of extinction will permit us to tap the kinematic information in molecular line surveys to produce a direct and independent determination of the Galactic rotation curve beyond the Solar circle. Independently we can use stellar proper motions from the difference in USNO-A2.0 and 2MASS positions, combined with our Spitzer/2MASS individual photometric parallaxes to millions of stars, to validate the CO rotation curve. Recognizing the breadth of likely community interest in this dataset beyond the science outlined here, we will waive all Spitzer proprietary data rights.
Babler Brian
Churchwell Edward
Indebetouw Remy
Majewski Steven
Meade Marilyn
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