A Spitzer survey of young stellar objects in the Rosette Molecular Cloud

C. J. Poulton, T. P. Robitaille, J. S. Greaves, I. A. Bonnell, J. P. Williams, M. H. Heyer

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

We present results from a survey of the Rosette Molecular Cloud (RMC) using both the Infrared Array Camera (IRAC) and Multiband Imaging Photometer for Spitzer (MIPS) onboard the Spitzer Space Telescope. We have mapped a region of active star formation covering an area approximately 1 degrees by 1.5 degrees including several previously known clusters. Spectral energy distributions (SEDs) fitted to our data combined with that from Two Micron All Sky Survey (2MASS) are used to identify young stellar objects (YSOs) with infrared (IR) excesses. We find that roughly 50 per cent of the sources are forming in clustered environments and identify seven clusters of IR excess sources including four that were previously unknown. We investigate evidence for triggering of star formation due to the ionization front, identified in Brackett-alpha emission, associated with the young open cluster NGC 2244. Although the position of several of the clusters of IR excess sources are coincident with the ionization front, the bulk of the youngest YSOs are located far from the ionization front, in clusters located along the mid-plane of the cloud. We conclude that although triggering from the H II nebula is a possible origin for some of the recent star formation, the majority of the active star formation is occurring in already dense regions of the cloud not compressed by the expansion of the H II region.

Original languageEnglish
Pages (from-to)1249-1262
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume384
DOIs
Publication statusPublished - 11 Mar 2008

Keywords

  • stars : formation
  • planetary systems : protoplanetary discs
  • stars : pre-main-sequence
  • ISM : clouds
  • HII regions
  • infrared : stars
  • 2-DIMENSIONAL RADIATIVE-TRANSFER
  • MULTISEEDED MULTIMODE FORMATION
  • SPECTRAL ENERGY-DISTRIBUTIONS
  • EMBEDDED CLUSTERS
  • STAR-FORMATION
  • PROTOSTELLAR ENVELOPES
  • SPATIAL-DISTRIBUTION
  • OB ASSOCIATIONS
  • COMPLEX
  • MODEL

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