Intergalactic HII Regions: Probing a Non-Standard Mode of Star Formation

Details Intergalactic HII Regions: Probing a Non-Standard Mode of Star Formation Intergalactic HII Regions: Probing a Non-Standard Mode of Star Formation

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20695p&link_type=abstract

Spitzer Proposal ID #20695

Computer Science

Scientific paper

We propose to image intergalactic HII regions with both IRAC and MIPS in all their bands, contributing to our understanding of star formation in extreme low density environments with no obvious external trigger. These HII regions represent star formation proceeding in an entirely different mode from the standard Schmidt law understanding. With MIPS, we plan to measure cold dust emission in the vicinity of these recently discovered objects and compare these measurements to regions with similar HI column densities that have not formed stars. The comparison will test the hypothesis that stars only begin forming in low density gas that is dust-rich. With IRAC, we will measure the warm dust emission near the intergalactic HII regions, as traced by PAH emission. IRAC observations will also identify any associated older stellar populations and assess the relationship of intergalactic HII regions to satellite galaxies.

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