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BLAST: The Mass Function, Lifetimes, and Properties of Intermediate Mass Cores from a 50 Square Degree Submillimeter Galactic Survey in Vela (l = ~265) | | Calvin. B. Netterfield
; Peter A. R. Ade
; James J. Bock
; Edward L. Chapin
; Mark J. Devlin
; Matthew Griffin
; Joshua O. Gundersen
; Mark Halpern
; Peter C. Hargrave
; David H. Hughes
; Jeff Klein
; Gaelen Marsden
; Peter G. Martin
; Phillip Mauskopf
; Luca Olmi
; Enzo Pascale
; Guillaume Patanchon
; Marie Rex
; Arabindo Roy
; Douglas Scott
; Christopher Semisch
; Nicholas Thomas
; Matthew D. P. Truch
; Carole Tucker
; Gregory S. Tucker
; Marco P. Viero
; Donald V. Wiebe
; | | Date: |
8 Apr 2009 | | Abstract: | We present first results from an unbiased, 50 square degree submillimeter
Galactic survey at 250, 350, and 500 microns from the 2006 flight of the
Balloon-borne Large Aperture Submillimeter Telescope (BLAST). The map has
resolution ranging from 36" to 60" in the three submillimeter bands spanning
the thermal emission peak of cold starless cores. We determine the temperature,
luminosity, and mass of more than a thousand compact sources in a range of
evolutionary stages and an unbiased statistical characterization of the
population. From comparison with C^18 O data, we find the dust opacity per gas
mass, kappa/R = 0.16 cm^2/g at 250 microns, for cold clumps. We find that 2% of
the mass of the molecular gas over this diverse region is in cores colder than
14 K, and that the mass function for these cold cores is consistent with a
power law with index alpha = -3.22 +/- 0.14 over the mass range 14 M_sun < M <
80 M_sun, steeper than the Salpeter alpha = -2.35 initial massfunction for
stars. Additionally, we infer a mass dependent cold core lifetime of tau(M) =
4E6 (M/20 M_sun)^-0.9 years -- longer than what has been found in previous
surveys of either low or high mass cores, and significantly longer than free
fall or turbulent decay time scales. This implies some form of non-thermal
support for cold cores during this early stage of star formation. | | Source: | arXiv, 0904.1207 | | Services: | Forum | Review | PDF | Favorites | |
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