Direct Physical Diagnostics of Triggered Star Formation

Details Direct Physical Diagnostics of Triggered Star Formation Direct Physical Diagnostics of Triggered Star Formation

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50326b&link_type=abstract

Spitzer Proposal ID #50326

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Scientific paper

We propose to combine the unique spectroscopic capabilities of Spitzer IRS and the VLA to study possible instances of triggered star formation using a more comprehensive range of diagnostics than ever before. This study is essential to move beyond morphological and photometric color arguments (e.g. the spatial distribution of red sources) for triggered star formation. In particular, Spitzer IRS data will allow us to (I) Determine the ionized gas properties via comprehensive photoionization modeling of the HII region; (II) Perform detailed modeling of the PDR including penetration of UV radiation and heating; (III) Locate and model shocks that may be compressing gas in the triggering zone; and (IV) Tightly constrain the nature and evolutionary state of embedded sources in the rim to see if their age and the distribution of circumstellar material is consistent with formation by triggering. Together with VLA ammonia data (proposed separately) these Spitzer IRS diagnostics will allow us to conclusively determine the nature of the triggering forces (ionized gas pressure and shocks), conditions in the triggered molecular gas, and the natures of the putatively triggered protostars. Moreover, by providing a complete picture of the physical conditions in the ionized, PDR, and molecular gas, these data offer the best chance to date to distinguish between the leading theories for HII region triggering: collect-and-collapse and radiation driven implosion.

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