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Title:
A Coherent Timing Solution for the Nearby Isolated Neutron Star RX J0720.4-3125
Authors:
Kaplan, D. L.; van Kerkwijk, M. H.
Affiliation:
AA(Pappalardo Fellow.; Center for Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, 37-664D, Cambridge, MA 02139; .), AB(Department of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada; .)
Publication:
The Astrophysical Journal, Volume 628, Issue 1, pp. L45-L48. (ApJL Homepage)
Publication Date:
07/2005
Origin:
UCP
ApJ Keywords:
Stars: Pulsars: Individual: Alphanumeric: RX J0720.4-3125, Stars: Neutron, X-Rays: Stars
DOI:
10.1086/432536
Bibliographic Code:
2005ApJ...628L..45K

Abstract

We present the results of a dedicated effort to measure the spin-down rate of the nearby isolated neutron star RX J0720.4-3125. Comparing arrival times of the 8.39 s pulsations for data from Chandra, we derive an unambiguous timing solution for RX J0720.4-3125 that is accurate to <0.1 cycles over >5 years. Adding data from XMM and ROSAT, the final solution yields P˙=(6.98+/-0.02)×10-14 s s-1; for dipole spin-down, this implies a characteristic age of 2 Myr and a magnetic field strength of 2.4×1013 G. The phase residuals are somewhat larger than those for purely regular spin-down, but they do not show conclusive evidence for higher order terms or a glitch. From our timing solution as well as recent X-ray spectroscopy, we concur with recent suggestions that RX J0720.4-3125 is most likely an off-beam radio pulsar with a moderately high magnetic field.
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