Simba Survey Toward High-Mass Star Forming Regions in the Southern Hemisphere

Abstract

We summarize the results of a 1.2-mm dust continuum emission survey toward 146 IRAS point-sources, selected from the CS(2-1) survey of Bronfman et al. (1996), thought to be associated with young massive stars. The survey, carried out using the SIMBA Bolometer at the SEST in La Silla, is sensitive to detection of cores of at least 40 solar masses at a typical distance of 5 kpc. Regions of ∼;15′×10′ were mapped with angular resolution of 24″ toward each IRAS source, detecting 1.2-mm emission in all observed regions. Half of the maps show the presence of two or more 1.2 mm sources. The 1.2-mm cores associated with the IRAS sources have typically radii of 0.4 pc, masses of 4×10³ M _⊙, luminosities of 2 × 10⁵ L _⊙ and temperatures of 32 K. We have detected, in a handful of regions, 1.2-mm sources with no counterparts in the IRAS and MSX surveys, which we suggest correspond to cold, massive starless cores.