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CHaMP: From Molecular Clouds to Massive Young Clusters

Published online by Cambridge University Press:  31 March 2017

Peter J. Barnes
Peter J. Barnes*
Affiliation:
Astronomy Dept., University of Florida, PO Box 112055, Gainesville FL 32611, USA email: [email protected] School of Science & Technology, University of New England, Armidale NSW 2351, Australia
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Abstract

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I review the major science outcomes to date of the Galactic Census of High- and Medium-mass Protostars (CHaMP), and also report the latest observational results on this unbiased, uniform sample of massive, cluster-forming molecular clumps, based on new mm-wave and IR data. These clouds represent the vast, subthermally-excited population of clumps predicted by Narayanan et al. (2008) to dominate the molecular mass of disk galaxies. Besides confirming their existence, we have presented evidence that these massive clumps probably spend a large fraction (90–95%) of their long lives (possibly up to 100 Myr) in a mostly quiescent, low star formation rate (SFR) state. This is likely ended when a density or internal pressure threshold is crossed, after which vigorous, massive cluster formation consumes the densest gas with a high SFR, dispersing the embedding envelope. New results presented in two other posters at this Symposium include (1) the first analysis of HCN emission from the dense gas (Schap et al.2015), and (2) the first deep photometry of clusters in this sample based on NIR AAT & CTIO data, and on MIR Warm Spitzer IRAC data (Dallilar et al.2015).

Keywords

Star formationmolecular cloudscluster formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 123 - 124
Copyright
Copyright © International Astronomical Union 2017 

References

Barnes, P. J., Yonekura, Y., & Fukui, Y., et al. 2011, ApJS, 196, 12 CrossRefGoogle Scholar
Barnes, P. J., Ryder, S. D. & O'Dougherty, S. N., et al. 2013, MNRAS, 432, 2231 CrossRefGoogle Scholar
Dallilar, Y., Barnes, P. J., Lada, E. A., & Ryder, S. D. 2015, in IAU Symp. 316, Formation, Evolution, and Survival of Massive Star Clusters, Charbonnel, C. & Nota, A., eds. (CUP: Cambridge), in pressGoogle Scholar
Narayanan, D., Cox, T. J., & Shirley, Y., et al. 2008, ApJ, 684, 996 CrossRefGoogle Scholar
Schap, W., Barnes, P. J., Ginsberg, A., & Ordonez, A. 2015, in IAU Symp. 316, Formation, Evolution, and Survival of Massive Star Clusters, Charbonnel, C. & Nota, A., eds. (CUP: Cambridge), in pressGoogle Scholar