N. D'Amico et al 2002 ApJ 570 L89 doi:10.1086/341030
Timing of Millisecond Pulsars in NGC 6752: Evidence for a High Mass-to-Light Ratio in the Cluster Core
FREEN. D'Amico1,2, A. Possenti1, L. Fici3, R. N. Manchester4, A. G. Lyne5, F. Camilo6 and J. Sarkissian7
Show affiliationsUsing pulse timing observations, we have obtained precise parameters, including positions with ~20 mas accuracy, of five millisecond pulsars in NGC 6752. Three of them, located relatively close to the cluster center, have line-of-sight accelerations larger than the maximum value predicted by the central mass density derived from optical observation, providing dynamical evidence for a central mass-to-light ratio 
10, much higher than for any other globular cluster. It is likely that the other two millisecond pulsars have been ejected out of the core to their present locations at 1.4 and 3.3 half-mass radii, respectively, suggesting unusual nonthermal dynamics in the cluster core.
- Subject headings
globular clusters: individual (NGC 6752); pulsars: individual (PSR J1910-5959B, PSR J1910-5959D, PSR J1910-5959E, PSR J1911-5958A, PSR J1911-6000C)
- Dates
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Issue 2 (2002 May 10)
Received 2002 February 26, accepted for publication 2002 April 3
Published 2002 April 12
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Timing of Millisecond Pulsars in NGC 6752: Evidence for a High Mass-to-Light Ratio in the Cluster Core
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