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D. Capellupo (University of Rochester), E. Churchwell (UW-Madison)
For my summer REU project at the University of Wisconsin-Madison, I analyzed color-color diagrams of point sources from the GLIMPSE survey. The Galactic Legacy Infrared Mid-Plane Survey Extraordinaire used the Spitzer space telescope to cover the longitude range l = +/-10 to 65 degrees and latitude b = -1 to 1 degree in four mid-infrared wavelength bands (3.6, 4.5, 5.8, and 8.0 microns). Out of the 30 million point sources in the GLIMPSE catalog, 44,464 have a [K]-[8.0] color of at least 3. These objects were plotted in a logarithmic contour plot on a [3.6]-[8.0] versus [3.6]-[4.5] color-color diagram. Two distinct peaks appear on this plot, one (upper peak) centered around (x=0.54,y=1.78) and the other (lower peak) centered around (x=0.41,y=0.95). It turns out that the objects in the upper peak are fairly evenly distributed throughout the GLIMPSE survey region, while the lower peak objects tend to cluster in dense star-forming regions. After doing a SIMBAD search on these objects, only one object in the SIMBAD database could be determined a match to a lower peak object: a YSO. For the upper peak, there were 23 matches, including 6 YSOs, 4 H-alpha emission stars, and 9 high-amplitude variables. This research was supported by the NSF through an Astronomy and Astrophysics REU site grant (AST-0453442) at UW-Madison.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.