Astrophys. J., 666, 321-338 (2007/September-1)
Embedded star formation in the Eagle nebula with Spitzer GLIMPSE.
INDEBETOUW R., ROBITAILLE T.P., WHITNEY B.A., CHURCHWELL E., BABLER B., MEADE M., WATSON C. and WOLFIRE M.
Abstract (from CDS):
We present new Spitzer photometry of the Eagle Nebula (M16, containing the optical cluster NGC 6611) combined with near-infrared photometry from 2MASS. We use dust radiative transfer models, mid-infrared and near-infrared color-color analysis, and mid-infrared spectral indices to analyze point-source spectral energy distributions, select candidate YSOs, and constrain their mass and evolutionary state. Comparison of the different protostellar selection methods shows that mid-infrared methods are consistent, but as has been known for some time, near-infrared-only analysis misses some young objects. We reveal more than 400 protostellar candidates, including one massive YSO that has not been previously highlighted. The YSO distribution supports a picture of distributed low-level star formation, with no strong evidence of triggered star formation in the ``pillars.'' We confirm the youth of NGC 6611 by a large fraction of infrared excess sources and reveal a younger cluster of YSOs in the nearby molecular cloud. Analysis of the YSO clustering properties shows a possible imprint of the molecular cloud's Jeans length. Multiwavelength mid-IR imaging thus allows us to analyze the protostellar population, to measure the dust temperature and column density, and to relate these in a consistent picture of star formation in M16.
Infrared: Stars - Methods: Data Analysis - Stars: Formation
Table 1: [IRW2007] HH-W (Nos HH-N, HH-S), [IRW2007] P5A (Nos P5A, P5B), [IRW2007] MYSO N=1.
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