Triggered Star Formation and Dust around Mid-Infrared-Identified Bubbles
  We use Two Micron All Sky Survey, GLIMPSE, and MIPSGAL survey data to analyze
the young stellar object (YSO) and warm dust distribution around several
mid-infrared-identified bubbles. We identify YSOs using J-band to 8 um
photometry and correlate their distribution relative to the PDR (as traced by
diffuse 8 um emission) which we assume to be associated with and surround a HII
region. We find that only 20% of the sample HII regions appear to have a
significant number of YSOs associated with their PDRs, implying that triggered
star formation mechanisms acting on the boundary of the expanding HII region do
not dominate in this sample. We also measure the temperature of dust inside 20
HII regions using 24 um and 70 um MIPSGAL images. In eight circularly symmetric
sources we analyze the temperature distribution and find shallower temperature
gradients than is predicted by an analytic model. Possible explanations of this
shallow temperature gradient are a radially dependent grain-size distribution
and/or non-equilibrium radiative processes.
