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Old Pulsars in the Low-Density Globular Clusters M13 and M53

Kulkarni, S. R. and Anderson, S. B. and Prince, Thomas A. and Wolszczan, A. (1991) Old Pulsars in the Low-Density Globular Clusters M13 and M53. Nature, 349 (1). p. 47. ISSN 0028-0836.

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Millisecond pulsars are conventionally assumed to be spun up through the action of binary companions, although some subsequently lose their companions and appear as isolated pulsars. Such objects should therefore be more numerous in dense stellar systems. We report here the surprising discovery of two pulsars in low-density globular clusters: one is a single 10-ms pulsar (1639+36) in M13 (NGC620S), the other a 33-ms pulsar (1310+ 18) in a 256-day binary in MS3 (NGCS02S). Their ages, inferred from their luminosities and constraints on their period derivatives, seem to be -10^9 years, significantly greater than previously reported ages (≤10^8 years) of cluster pulsars^1. The implied birth rate is inconsistent with the conventional two-body tidal capture model^2,^3, suggesting that an alternative mechanism such as tidal capture between primordial binaries and a reservoir of (hundreds of) primordial neutron stars may dominate the production of tidal binaries in such clusters^1,^4• The period derivative of PSR1639+36 is surprisingly small, and may be corrupted by acceleration due to the mean gravitational potential of the cluster. We discovered the pulsars during a survey of globular^5.

Item Type:Article
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URLURL TypeDescription ReadCube access
Kulkarni, S. R.0000-0001-5390-8563
Prince, Thomas A.0000-0002-8850-3627
Additional Information:© 1991 Nature Publishing Group. Received 10 August accepted 9 November 1990. We thank A. S. Fruchter for donation of telescope time, J. H. Taylor for the TEMPO software package, and E. S. Phinney and S. Djorgovski for discussions. This work was supported by NSF Presidential Young Investigator awards (TAP. and S.R.K.), the Department of Energy (T.A.P.), an NSF Graduate Felloship (SBA), and an Alfred P. Sloan Fellowship (S.R.K.). Arecibo Observatory is part of the National Astronomy and Ionosphere Centre, operated by Cornell University under contract with the NSF.
Group:Space Radiation Laboratory
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Department of Energy (DOE)UNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1990-05
Issue or Number:1
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45567
Deposited By: Deborah Miles
Deposited On:07 May 2014 20:43
Last Modified:03 Oct 2019 06:32

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