The diverse Stellar populations of the W3 star-forming complex

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

An ∼800 arcmin2 mosaic image of the W3 star-forming complex obtained with the Chandra X-Ray Observatory gives a valuable new view of the spatial structure of its young stellar populations. The Chandra image reveals ∼1300 faint X-ray sources, most of which are pre-main-sequence (PMS) stars in the cloud. Some, but not all, of the highmass stars producing hypercompact and ultracompact H II (UC H II) regions are also seen, as reported in a previous study. The Chandra images reveal three dramatically different embedded stellar populations. The W3 Main cluster extends over 7 pc with ∼900 X-ray stars in a nearly spherical distribution centered on the well-studied UC H II regions and high-mass protostars. The cluster surrounding the prototypical UC H II region W3(OH) shows a much smaller (<0.6 pc), asymmetrical, and clumpy distribution of ∼50 PMS stars. The massive star ionizing the W3 North H II region is completely isolated without any accompanying PMS stars. In W3 Main, the inferred ages of the widely distributed PMS stars are significantly older than the inferred ages of the central OB stars illuminating the UC H II regions. We suggest that different formation mechanisms are necessary to explain the diversity of the W3 stellar populations: cluster-wide gravitational collapse with delayed OB star formation in W3 Main, collect-and-collapse triggering by shock fronts in WS(OH). and a runaway O star or isolated massive star formation in W3 North.

Original languageEnglish (US)
Pages (from-to)354-362
Number of pages9
JournalAstrophysical Journal
Volume673
Issue number1
DOIs
StatePublished - Jan 20 2008

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'The diverse Stellar populations of the W3 star-forming complex'. Together they form a unique fingerprint.

  • Cite this