# The Dynamics of Dense Cores in the Perseus Molecular Cloud II: the Relationship between Dense Cores and the Cloud

 Title: The Dynamics of Dense Cores in the Perseus Molecular Cloud II: the Relationship between Dense Cores and the Cloud Author: Kirk, Helen; Pineda, Jaime E.; Johnstone, Doug; Goodman, Alyssa A. Note: Order does not necessarily reflect citation order of authors. Citation: Kirk, Helen, Jaime E. Pineda, Doug Johnstone, and Alyssa Goodman. The dynamics of dense cores in the Perseus molecular cloud II: the relationship between dense cores and the cloud. 2010. The Astrophysical Journal 723(1): 457-475. Full Text & Related Files: 566792.pdf (1.047Mb; PDF) Abstract: We utilize the extensive datasets available for the Perseus molecular cloud to analyze the relationship between the kinematics of small-scale dense cores and the larger structures in which they are embedded. The kinematic measures presented here can be used in conjunction with those discussed in our previous work as strong observational constraints that numerical simulations (or analytic models) of star formation should match. We find that dense cores have small motions with respect to the $$^{13}CO$$ gas, about one third of the $$^{13}CO$$ velocity dispersion along the same line of sight. Within each extinction region, the core- to-core velocity dispersion is about half of the total $$(^{13}CO)$$ velocity dispersion seen in the region. Large-scale velocity gradients account for roughly half of the total velocity dispersion in each region, similar to what is predicted from large-scale turbulent modes following a power spectrum of $$P(k) \alpha \ k^{−4}$$. Published Version: doi:10.1088/0004-637X/723/1/457 Other Sources: http://arxiv.org/abs/1008.4527v1 Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:4854907

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Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University