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Title:
The Discovery of an Eccentric Millisecond Pulsar in the Galactic Plane
Authors:
Champion, David J.; Ransom, Scott M.; Lazarus, Patrick; Camilo, Fernando; Kaspi, Victoria M.; Nice, David J.; Freire, Paulo C. C.; Cordes, James M.; Hessels, Jason W. T.; Bassa, Cees; Lorimer, Duncan R.; Stairs, Ingrid H.; van Leeuwen, Joeri; Arzoumnian, Zaven; Backer, Don C.; Bhat, N. D. Ramesh; Chatterjee, Shami; Crawford, Fronefield; Deneva, Julia S.; Faucher-Giguère, Claude-André; Gaensler, B. M.; Han, Jinlin; Jenet, Fredrick A.; Kasian, Laura; Kondratiev, Vlad I.; Kramer, Michael; Lazio, Joseph; McLaughlin, Maura A.; Stappers, Ben W.; Venkataraman, Arun; Vlemmings, Wouter
Affiliation:
AA(McGill University Physics Department, 3600 Rue University, Montreal, H3A 2T8, Canada), AB(NRAO, 520 Edgemont Rd., Charlottesville, VA 22903, USA), AC(McGill University Physics Department, 3600 Rue University, Montreal, H3A 2T8, Canada), AD(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA), AE(McGill University Physics Department, 3600 Rue University, Montreal, H3A 2T8, Canada), AF(Physics Department, Bryn Mawr College, Bryn Mawr, PA 19010, USA), AG(NAIC, Arecibo Observatory, HC03 Box 53995, PR 00612, USA), AH(Astronomy Department, Cornell University, Ithaca, NY 14853, USA), AI(Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands), AJ(McGill University Physics Department, 3600 Rue University, Montreal, H3A 2T8, Canada), AK(Department of Physics, West Virginia University, Morgantown, WV 26506, USA), AL(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada), AM(Astronomy Department, 441 Campbell Hall, University of California at Berkeley, Berkeley, CA 94720-3411, USA), AN(CRESST and X-ray Astrophysics Laboratory, NASA-GSFC, Code 662, Greenbelt, MD 20771), AO(Astronomy Department, 441 Campbell Hall, University of California at Berkeley, Berkeley, CA 94720-3411, USA), AP(Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia), AQ(Astronomy Department, Cornell University, Ithaca, NY 14853, USA), AR(Department of Physics and Astronomy, Franklin & Marshall College, P.O. Box 3003, Lancaster, PA 17604-3003, USA), AS(Astronomy Department, Cornell University, Ithaca, NY 14853, USA), AT(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-10, Cambridge, MA 02138, USA), AU(School of Physics, The University of Sydney, NSW 2006 Australia), AV(National Astronomical Observatoires, Chinese Academy of Sciences, Jia-20 DaTun Road, Chaoyang District, Beijing 100012, China), AW(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada), AX(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada), AY(Department of Physics, West Virginia University, Morgantown, WV 26506, USA), AZ(Department of Physics, West Virginia University, Morgantown, WV 26506, USA), BA(Department of Physics, West Virginia University, Morgantown, WV 26506, USA), BB(Department of Physics, West Virginia University, Morgantown, WV 26506, USA), BC(NAIC, Arecibo Observatory, HC03 Box 53995, PR 00612, USA), BD(NAIC, Arecibo Observatory, HC03 Box 53995, PR 00612, USA), BE(Jodrell Bank Observatory, Manchester University, Macclesfield, Cheshire SK11 9DL, UK)
Publication:
40 YEARS OF PULSARS: Millisecond Pulsars, Magnetars and More. AIP Conference Proceedings, Volume 983, pp. 448-452 (2008). (AIPC Homepage)
Publication Date:
02/2008
Origin:
AIP
PACS Keywords:
Pulsars, Neutron stars, Binary and multiple stars, Spiral galaxies, Globular clusters in the Milky Way
DOI:
10.1063/1.2900272
Bibliographic Code:
2008AIPC..983..448C

Abstract

The evolution of binary systems is governed by their orbital properties and the stellar density of the local environment. Studies of neutron stars in binary star systems offer unique insights into both these issues. In an Arecibo survey of the Galactic disk, we have found PSR J1903+0327, a radio emitting neutron star (a ``pulsar'') with a 2.15 ms rotation period, in a 95-day orbit around a massive companion. Observations in the infra-red suggests that the companion may be a main-sequence star. Theories requiring an origin in the Galactic disk cannot account for the extraordinarily high orbital eccentricity observed (0.44) or a main-sequence companion of a pulsar that has spin properties suggesting a prolonged accretion history. The most likely formation mechanism is an exchange interaction in a globular star cluster. This requires that the binary was either ejected from its parent globular cluster as a result of a three-body interaction, or that that cluster was disrupted by repeated passages through the disk of the Milky Way.
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