TESTING TRIGGERED STAR FORMATION IN SIX H II REGIONS

William J. Dirienzo*, Remy Indebetouw, Crystal Brogan, Claudia J. Cyganowski, Ed Churchwell, Rachel K. Friesen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

We investigated six H II regions with infrared, bright rimmed bubble or cometary morphology, in search of quantitative evidence for triggered star formation, both collect and collapse and radiatively driven implosion (RDI). We identified and classified 458 young stellar objects (YSOs) in and around the H II regions. YSOs were determined by fitting a collection of radiative transfer model spectral energy distributions to infrared photometry for a large sample of point sources. We determined areas where there exist enhanced populations of relatively unevolved YSOs on the bright rims of these regions, suggesting that star formation has been triggered there. We further investigated the physical properties of the regions by using radio continuum emission as a proxy for ionizing flux powering the H II regions, and 13CO(1-0) observations to measure masses and gravitational stability of molecular clumps. We used an analytical model of collect and collapse triggered star formation, as well as a simulation of RDI, and thus we compare the observed properties of the molecular gas with those predicted in the triggering scenarios. Notably, those regions in our sample that show evidence of cometary, or "blister," morphology are more likely to show evidence of triggering.

Original languageEnglish
Article number173
Number of pages26
JournalAstronomical Journal
Volume144
Issue number6
DOIs
Publication statusPublished - Dec 2012

Keywords

  • H II regions
  • ISM: bubbles
  • stars: formation
  • stars: protostars
  • YOUNG STELLAR OBJECTS
  • SPECTRAL ENERGY-DISTRIBUTIONS
  • RADIATION-DRIVEN IMPLOSION
  • BUBBLING GALACTIC DISK
  • ARRAY CAMERA IRAC
  • MILKY-WAY PROJECT
  • MOLECULAR CLOUD
  • HII-REGIONS
  • FORMING REGIONS
  • GLIMPSE SURVEY

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