Parker, R.J., Wright, N.J., Goodwin, S.P. et al. (1 more author) (2014) Dynamical evolution of star-forming regions. Monthly Notices of the Royal Astronomical Society, 438 (1). pp. 620-638. ISSN 0035-8711
Abstract
We model the dynamical evolution of star-forming regions with a wide range of initial properties. We follow the evolution of the regions’ substructure using the Q-parameter, we search for dynamical mass segregation using the !MSR technique, and we also quantify the evolution of local density around stars as a function of mass using the "LDR method. The amount of dynamical mass segregation measured by !MSR is generally only significant for subvirial and virialized, substructured regions – which usually evolve to form bound clusters. The "LDR method shows that massive stars attain higher local densities than the median value in all regions, even those that are supervirial and evolve to form (unbound) associations. We also introduce the Q − "LDR plot, which describes the evolution of spatial structure as a function of mass-weighted local density in a star-forming region. Initially dense (>1000 stars pc−2), bound regions always have Q > 1, "LDR > 2 after 5 Myr, whereas dense unbound regions always have Q < 1, "LDR > 2 after 5 Myr. Less dense regions (<100 stars pc−2) do not usually exhibit "LDR > 2 values, and if relatively high local density around massive stars arises purely from dynamics, then the Q − "LDR plot can be used to estimate the initial density of a star-forming region.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Keywords: | methods: numerical; stars: formation; open clusters and associations: general |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 18 Aug 2017 15:44 |
Last Modified: | 18 Aug 2017 15:47 |
Published Version: | https://doi.org/10.1093/mnras/stt2231 |
Status: | Published |
Publisher: | Oxford University Press |
Refereed: | Yes |
Identification Number: | 10.1093/mnras/stt2231 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:120298 |