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We present first results from an unbiased 50 deg^2 submillimeter Galacticsurvey at 250, 350, and 500 micron from the 2006 flight of the Balloon-borneLarge Aperture Submillimeter Telescope (BLAST). The map has resolution rangingfrom 36 arcsec to 60 arcsec in the three submillimeter bands spanning thethermal emission peak of cold starless cores. We determine the temperature,luminosity, and mass of more than one thousand compact sources in a range ofevolutionary stages and an unbiased statistical characterization of thepopulation. From comparison with C^(18)O data, we find the dust opacity per gasmass, kappa r = 0.16 cm^2 g^(-1) at 250 micron, for cold clumps. We find that2% of the mass of the molecular gas over this diverse region is in cores colderthan 14 K, and that the mass function for these cold cores is consistent with apower law with index alpha = -3.22 +/- 0.14 over the mass range 14 M_sun < M <80 M_sun. Additionally, we infer a mass-dependent cold core lifetime of t_c(M)= 4E6 (M/20 M_sun)^(-0.9) years - longer than what has been found in previoussurveys of either low or high mass cores, and significantly longer than freefall or likely turbulent decay times. This implies some form of non-thermalsupport for cold cores during this early stage of star formation.

astrophysical journal/the astrophysical journal

BLAST: The Mass Function, Lifetimes, and Properties of Intermediate Mass  Cores from a 50 Square Degree Submillimeter Galactic Survey in Vela (l =  ~265)