Precise γ-ray timing and radio observations of 17 Fermi γ-ray pulsars

Research output: Contribution to journalArticle

  • External authors:
  • P. S. Ray
  • M. Kerr
  • D. Parent
  • A. A. Abdo
  • L. Guillemot
  • S. M. Ransom
  • N. Rea
  • M. T. Wolff
  • A. Makeev
  • M. S E Roberts
  • F. Camilo
  • M. Dormody
  • P. C C Freire
  • J. E. Grove
  • C. Gwon
  • A. K. Harding
  • S. Johnston
  • M. Kramer
  • P. F. Michelson
  • R. W. Romani
  • P. M Saz Parkinson
  • D. J. Thompson
  • P. Weltevrede
  • K. S. Wood
  • M. Ziegler


We present precise phase-connected pulse timing solutions for 16 γ-ray-selected pulsars recently discovered using the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope plus one very faint radio pulsar (PSR J1124-5916) that is more effectively timed with the LAT. We describe the analysis techniques including a maximum likelihood method for determining pulse times of arrival from unbinned photon data. A major result of this work is improved position determinations, which are crucial for multiwavelength follow-up. For most of the pulsars, we overlay the timing localizations on X-ray images from Swift and describe the status of X-ray counterpart associations. We report glitches measured in PSRs J0007+7303, J1124-5916, and J1813-1246. We analyze a new 20ks Chandra ACIS observation of PSR J0633+0632 that reveals an arcminute-scale X-ray nebula extending to the south of the pulsar. We were also able to precisely localize the X-ray point source counterpart to the pulsar and find a spectrum that can be described by an absorbed blackbody or neutron star atmosphere with a hard power-law component. Another Chandra ACIS image of PSR J1732-3131 reveals a faint X-ray point source at a location consistent with the timing position of the pulsar. Finally, we present a compilation of new and archival searches for radio pulsations from each of the γ-ray-selected pulsars as well as a new Parkes radio observation of PSR J1124-5916 to establish the γ-ray to radio phase offset. © 2011. The American Astronomical Society. All rights reserved..

Bibliographical metadata

Original languageEnglish
Article number17
Issue number2
Publication statusPublished - Jun 2011