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Ejection of pulsars and binaries to the outskirts of globular clusters

Phinney, E. S. and Sigurdsson, Steinn (1991) Ejection of pulsars and binaries to the outskirts of globular clusters. Nature, 349 (6306). p. 220. ISSN 0028-0836. doi:10.1038/349220a0.

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THREE-BODY interactions can eject stars, singly or in binaries, from the core of a globular cluster to its outskirts, whither dynamical friction may take more than 10^8 yr to return them. We show here that such a process can explain why the binary pulsar 2127 + 11C in the cluster Ml5 (and perhaps 1744–24A in Terzan 5) is now far from the cluster core. A suitable encounter could have given the pulsar enough velocity to eject it to its present position, and also replaced its original stellar companion with a neutron star. For ejection of PSR2127 +11C to be likely, the core of M15 must be composed of heavy degenerate stars at a density greater than 10^7pc^(-3), maintained for ≳10^8yr; this is consistent with previous dynamical estimates. A natural combination of factors enables us to see 2127 + 11C: a binary of longer period could not have received a large enough impulse to escape the core, whereas one of shorter period would have been ejected from the cluster or would have collapsed because of orbital decay by gravitational radiation. Pulsars and pulsar binaries ejected from clusters will contribute to the birth rate of recycled pulsars in the inner Galaxy.

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Additional Information:© 1991 Nature Publishing Group. Received 28 June; accepted 21 November 1990. E.S.P. thanks B. Murphy and F. Verbunt for discussions and hospitality, and A. Meiksin for reading the manuscript. This work was supported in part by an NSF Presidential Young Investigator Award, Digital Equipment Corp. and the Alfred P. Sloan Foundation.
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NSF Presidential Young Investigator AwardUNSPECIFIED
Digital Equipment Corp.UNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:6306
Record Number:CaltechAUTHORS:20150513-110153405
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Official Citation:Ejection of pulsars and binaries to the outskirts of globular clusters 220-223 E. S. Phinney & Steinn Sigurdsson doi:10.1038/349220a0
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57496
Deposited By: Ruth Sustaita
Deposited On:13 May 2015 18:15
Last Modified:10 Nov 2021 21:50

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