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E.P. Mercer, D.P. Clemens, J.M. Jackson, T.M. Bania, J.M. Rathborne, R.Y. Shah (Boston University), GLIMPSE Team
How far does the GLIMPSE (Galactic Legacy Infrared Mid-Plane Survey Extraordinaire) survey see into the disk of the Milky Way? The distance out to which the GLIMPSE survey can see is the GLIMPSE horizon. This horizon can tell us what fraction of the Galaxy's volume we are able to probe at mid-IR wavelengths. The GLIMPSE survey has mapped some 220 square degrees of the inner Milky Way using the InfraRed Array Camera (IRAC) on the Spitzer Space Telescope, and has cataloged more than 30 million sources in the survey area. The GLIMPSE point source archive was binned over the region l = 18o - 55o and |b| < 1o to a resolution of 1.5' x 1.5' in each of the four IRAC wavebands. These data were compared with the high resolution BU-FCRAO Galactic Ring Survey (GRS) data of 13CO J=1-0. The GRS integrated intensity maps were binned to the same resolution and span the same region of sky. Using these binned datasets, we measured correlations of star count deficits with gas column densities along several lines of sight, and measured the extinction along these sight lines to determine the GLIMPSE horizon.
Support for this work was provided by NASA through contract 1225025 to BU and by the NSF through grant DGE-0221680.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.