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A Full Virial Analysis of the Prestellar Cores in the Ophiuchus Molecular Cloud

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Kate Pattle  and
Derek Ward-Thompson
Kate Pattle
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK email: [email protected], [email protected]
Derek Ward-Thompson
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK email: [email protected], [email protected]
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Abstract

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We use SCUBA-2, HARP C18O J= 3 → 2, Herschel and IRAM N2H+ J= 1 → 0 observations of the Ophiuchus molecular cloud to identify and characterise the properties of the starless cores in the region. The SCUBA-2, HARP and Herschel data were taken as part of the JCMT and Herschel Gould Belt Surveys. We determine masses and temperatures and perform a full virial analysis on our cores, and find that our cores are all either bound or virialised, with gravitational energy and external pressure energy on average of similar importance in confining the cores. There is wide variation from region to region, with cores in the region influenced by B stars (Oph A) being substantially gravitationally bound, and cores in the most quiescent region (Oph C) being pressure-confined. We observe dissipation of turbulence in all our cores, and find that this dissipation is more effective in regions which do not contain outflow-driving protostars. Full details of this analysis are presented by Pattle et al. (2015).

Keywords

stars: formation–ISM: clouds–ISM: kinematics and dynamics–ISM: individual objects: L1688–submillimeter: ISM
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E64
Copyright
Copyright © International Astronomical Union 2016 

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