Comparing Star Formation on Large Scales in the c2d Legacy Clouds: Bolocam 1.1 mm Dust Continuum Surveys of Serpens, Perseus, and Ophiuchus

We have undertaken an unprecedentedly large 1.1 mm continuum survey of three nearby star-forming clouds using Bolocam at the Caltech Submillimeter Observatory. We mapped the largest areas in each cloud at millimeter or submillimeter wavelengths to date: 7.5 deg super(2) in Perseus (Enoch and coworke...

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Bibliographic Details
Published in:	The Astrophysical journal 2007-09, Vol.666 (2), p.982-1001
Main Authors:	Enoch, Melissa L, Glenn, Jason, Evans II, Neal J, Sargent, Anneila I, Young, Kaisa E, Huard, Tracy L
Format:	Article
Language:	eng
Subjects:	Astronomy Earth, ocean, space Exact sciences and technology
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Summary:	We have undertaken an unprecedentedly large 1.1 mm continuum survey of three nearby star-forming clouds using Bolocam at the Caltech Submillimeter Observatory. We mapped the largest areas in each cloud at millimeter or submillimeter wavelengths to date: 7.5 deg super(2) in Perseus (Enoch and coworkers), 10.8 deg super(2) in Ophiuchus (Young and coworkers), and 1.5 deg super(2) in Serpens with a resolution of 31 double prime , detecting 122, 44, and 35 cores, respectively. Here we report on results of the Serpens survey and compare the three clouds. Average measured angular core sizes and their dependence on resolution suggest that many of the observed sources are consistent with power-law density profiles. Tests of the effects of cloud distance reveal that linear resolution strongly affects measured source sizes and densities, but not the shape of the mass distribution. Core mass distribution slopes in Perseus and Ophiuchus ( alpha = 2.1 plus or minus 0.1 and 2.1 plus or minus 0.3) are consistent with recent measurements of the stellar IMF, whereas the Serpens distribution is flatter ( alpha = 1.6 plus or minus 0.2). We also compare the relative mass distribution shapes to predictions from turbulent fragmentation simulations. Dense cores constitute less than 10% of the total cloud mass in all three clouds, consistent with other measurements of low star formation efficiencies. Furthermore, most cores are found at high column densities; more than 75% of 1.1 mm cores are associated with A sub(v) [unk] 8 mag in Perseus, 15 mag in Serpens, and 20-23 mag in Ophiuchus.
ISSN:	0004-637X 1538-4357