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Originally published in Science Express on 13 January 2005
Science 11 February 2005:
Vol. 307. no. 5711, pp. 892 - 896
DOI: 10.1126/science.1108632
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Research Articles

Twenty-One Millisecond Pulsars in Terzan 5 Using the Green Bank Telescope

Scott M. Ransom,1,2* Jason W. T. Hessels,2 Ingrid H. Stairs,3 Paulo C. C. Freire,4 Fernando Camilo,5 Victoria M. Kaspi,2 David L. Kaplan6

We have identified 21 millisecond pulsars (MSPs) in globular cluster Terzan 5 by using the Green Bank Telescope, bringing the total of known MSPs in Terzan 5 to 24. These discoveries confirm fundamental predictions of globular cluster and binary system evolution. Thirteen of the new MSPs are in binaries, of which two show eclipses and two have highly eccentric orbits. The relativistic periastron advance for the two eccentric systems indicates that at least one of these pulsars has a mass 1.68 times greater than the mass of the Sun at 95% confidence. Such large neutron star masses constrain the equation of state of matter at or beyond the nuclear equilibrium density.

1 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA.
2 Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada.
3 Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada.
4 National Astronomy and Ionosphere Center, Arecibo Observatory, HC03 Box 53995, PR 00612, USA.
5 Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA.
6 Center for Space Research, Massachusetts Institute of Technology, 70 Vassar Street, Cambridge, MA 02139, USA.

* To whom correspondence should be addressed. E-mail: sransom{at}nrao.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
An Eccentric Binary Millisecond Pulsar in the Galactic Plane.
D. J. Champion, S. M. Ransom, P. Lazarus, F. Camilo, C. Bassa, V. M. Kaspi, D. J. Nice, P. C. C. Freire, I. H. Stairs, J. van Leeuwen, et al. (2008)
Science 320, 1309-1312
   Abstract »    Full Text »    PDF »
A Radio Pulsar Spinning at 716 Hz.
J. W. T. Hessels, S. M. Ransom, I. H. Stairs, P. C. C. Freire, V. M. Kaspi, and F. Camilo (2006)
Science 311, 1901-1904
   Abstract »    Full Text »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)