| Type |
Conference Paper |
| Names |
Robert A. Benjamin, B. Whitney, M. Meade, B. Babler, C. Watson, E. Churchwell, GLIMPSE360 team |
| Proceedings Title |
Bulletin of the American Astronomical Society |
| Conference Name |
American Astronomical Society, AAS Meeting #217, #241.14 |
| Volume |
43 |
| Pages |
24114 |
| Date |
January 1, 2011 |
| Short Title |
GLIMPSE360 |
| URL |
http://adsabs.harvard.edu/abs/2011AAS...21724114B |
| Library Catalog |
NASA ADS |
| Abstract |
We present compelling new evidence for the "truncation" of the Galactic
stellar disk at R=13.4 ±0.4 kpc using data from the Spitzer Space
Telescope's Warm Mission program GLIMPSE 360, a mid-infrared survey at
3.6 and 4.5 microns of the outer Galactic disk and warp, from galactic
longitude l=65 to 265 degrees. The truncation is detected as a drop-off
in the number of red giant stars per square degree fainter than a
certain magnitude. Our average truncation distance is in excellent
agreement with previous measurements of the truncation distance. By
mapping the changing apparent magnitude of the dropoff as a function of
Galactic longtiude, we are able to determine, for the first time, the
variation in the truncation radius as a function of Galactic azimuth.
Using TRILEGAL models of Galactic starcounts, we also constrain whether
there is a sharp or more gradual dropoff in the density of the Galactic
stellar disk beyond the truncation radius. This research was supported
by NASA/JPL contract 1368014 and NASA ATP grant NNX10AI70G to the
University of Wisconsin-Whitewater. |