Bridging the gap: A Spitzer Census of Intermediate-Mass Star Forming Regions from Galactic Surveys.

Details Bridging the gap: A Spitzer Census of Intermediate-Mass Star Forming Regions from Galactic Surveys. Bridging the gap: A Spitzer Census of Intermediate-Mass Star Forming Regions from Galactic Surveys.

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50623k&link_type=abstract

Spitzer Proposal ID #50623

Physics

Scientific paper

High-mass star formation (M>10 Msun) appears to proceed through different channels than low-mass star formation (M<2 Msun). The differences between these two regimes are thought to include not only the timescales and masses involved but also the initial conditions and operative physics within the parent molecular clouds. We propose an archival analysis of ~50 *intermediate-mass* star formation (SF) regions that straddle the boundary between these two regimes---regions forming stars up to 4-8 Msun. These, relatively unknown and unstudied IR sources are selected by their IRAS colors and lie within the Spitzer GLIMPSE+MIPSGAL legacy survey fields. Compared to their more famous high-mass SF cousins (e.g., the Westerhout 'W' HII objects), these regions are radio-quiet, relatively nearby, and structurally less complex. We will use complementary public-domain 13CO, 21-cm, and radio continuum Galactic surveys to 1) confirm the intermediate-mass SF nature of these objects, 2) compile a catalog and an atlas of mid-IR morphologies, 3) estimate distances, 4) calculate total luminosities and gas masses of affiliated molecular and atomic material, and 5) identify associated young stellar objects using IRAC+[24] colors. This work will provide a benchmark useful for contrasting the star formation process in both lower-mass and higher-mass SF environments.

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