Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916013c&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #160.13; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a comparative study of SAGE data with archival Hubble Space Telescope (HST) observations on selected Large Magellanic Cloud (LMC) star formation regions. SAGE (Surveying the Agents of a Galaxy's Evolution) includes a complete survey of the LMC with both the Infrared Array Camera (IRAC) and MIPS, the Multiband Imaging Photometer for Spitzer, aboard the Spitzer Space Telescope. These infrared data allow us to locate and identify young stellar objects (YSOs). IRAC 3.6, 4.5, 5.8, and 8.0 micron observations, coupled with MIPS 24 micron data, facilitate the identification of embedded YSOs and the distinction between various YSO classes. Interstellar dust emission peaks in the longer infrared wavelengths and is well detected by the MIPS 70 and 160 micron bands. These unprecedented infrared data allow the detection of never before seen YSO populations in the LMC. However, confusion of these YSOs with unresolved background galaxy populations makes the complete census of YSOs a challenging task. With the factor of ten better angular resolution of HST, background galaxies become resolved and their distinction from the YSOs becomes straightforward. Our comparative study reveals that the SAGE data highlights the embedded YSO populations of Class 0 and I, while the HST data reveals the more exposed, and fainter, pre-main sequence population.
The SAGE Project is supported by NASA/Spitzer grant 1275598 and NASA NAG5-12595.
Babler Brian
Block Martin M.
Carlson Lynn R.
Engelbracht Charles
For Biqing
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