WISE Observations of The Evolution of Massive Star Forming Regions

Details WISE Observations of The Evolution of Massive Star Forming Regions WISE Observations of The Evolution of Massive Star Forming Regions

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932007k&link_type=abstract

American Astronomical Society, AAS Meeting #219, #320.07

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of a mid-infrared survey of 11 outer Galaxy massive star forming regions and 3 open clusters with data from the Wide-field Infrared Survey Explorer (WISE). Using a newly developed photometric scheme to identify young stellar objects (YSOs) and exclude extragalactic contamination, we have studied the distribution of young stars within each region. These data tend to support the hypothesis that latter generations may be triggered by the interaction of winds and radiation from the first burst of massive star formation with the
molecular cloud material left over from that earlier generation of stars. We dub this process the 'fireworks hypothesis' since star formation by this mechanism would proceed rapidly and resemble a burst of fireworks. We have also analyzed small cutout WISE images of the structures around the edges of these massive star forming regions. We observe large (1-3 pc size) pillar and trunk-like structures of diffuse emission nebulosity tracing excited PAH molecules and small dust grains at the perimeter of the massive star forming regions. These structures contain small clusters of emerging Class I and Class II sources, but some are forming only a single to a few new stars.

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