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Analogues of Cores and Stars in Simulated Molecular Clouds

Published online by Cambridge University Press:  27 April 2011

James Wadsley ,
Michael Reid ,
Farid Qamar ,
Alison Sills  and
Nicholas Petitclerc
James Wadsley*
Affiliation:
Dept. Physics & Astronomy, McMaster University, 1280 Main St. W., Hamilton, ON, L8S 4M1, Canada
Michael Reid
Affiliation:
Dept. Astronomy & Astrophysics, University of Toronto, ON, M5S 3H4, Canada
Farid Qamar
Affiliation:
Dept. Physics & Astronomy, McMaster University, 1280 Main St. W., Hamilton, ON, L8S 4M1, Canada
Alison Sills
Affiliation:
Dept. Physics & Astronomy, McMaster University, 1280 Main St. W., Hamilton, ON, L8S 4M1, Canada
Nicholas Petitclerc
Affiliation:
Dept. Physics & Astronomy, McMaster University, 1280 Main St. W., Hamilton, ON, L8S 4M1, Canada
*
Corresponding author email: wadsley@mcmaster.ca
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Abstract

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We use images derived from collapsing, turbulent molecular cloud simulations without sinks to explore the effects of finite image angular resolution and noise on the derived clump mass function. These effects randomly perturb the clump masses, producing a lognormal clump mass function with a Salpeter-like high mass end. We show that the characteristic break mass of the simulated clump mass functions changes with the angular resolution of the images in a way that is entirely consistent with the observations. We also present some cautionary tales regarding sink particles and highlight the need to ensure that sinks actually correspond to distinct collapsing objects. We test several popular numerical sink criteria in the literature and compare to converged, non-sink results.

Keywords

ISM: structuresubmillimetermethods: data analysisstars: mass functionstars: formationmethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S270: Computational Star Formation , May 2010 , pp. 129 - 132
Copyright
Copyright © International Astronomical Union 2011

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