Three millisecond pulsars in Fermi LAT unassociated bright sources

S. M. Ransom, P. S. Ray, F. Camilo, M. S.E. Roberts, Ö Çelik, M. T. Wolff, C. C. Cheung, M. Kerr, T. Pennucci, M. E. Decesar, I. Cognard, A. G. Lyne, B. W. Stappers, P. C.C. Freire, J. E. Grove, A. A. Abdo, G. Desvignes, D. Donato, E. C. Ferrara, N. GehrelsL. Guillemot, C. Gwon, A. K. Harding, S. Johnston, M. Keith, M. Kramer, P. F. Michelson, D. Parent, P. M.Saz Parkinson, R. W. Romani, D. A. Smith, G. Theureau, D. J. Thompson, P. Weltevrede, K. S. Wood, M. Ziegler

Research output: Contribution to journalArticle


We searched for radio pulsars in 25 of the non-variable, unassociated sources in the Fermi LAT Bright Source List with the Green Bank Telescope at 820 MHz. We report the discovery of three radio and γ-ray millisecond pulsars (MSPs) from a high Galactic latitude subset of these sources. All of the pulsars are in binary systems, which would have made them virtually impossible to detect in blind γ-ray pulsation searches. They seem to be relatively normal, nearby (≤2 kpc) MSPs. These observations, in combination with the Fermi detection of γ-rays from other known radio MSPs, imply that most, if not all, radio MSPs are efficient γ-ray producers. The γ-ray spectra of the pulsars are power law in nature with exponential cutoffs at a few GeV, as has been found with most other pulsars. The MSPs have all been detected as X-ray point sources. Their soft X-ray luminosities of ∼10 30-1031 erg s-1 are typical of the rare radio MSPs seen in X-rays.

Original languageEnglish (US)
JournalAstrophysical Journal Letters
Issue number1 PART II
StatePublished - Jan 20 2011


  • Pulsars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Ransom, S. M., Ray, P. S., Camilo, F., Roberts, M. S. E., Çelik, Ö., Wolff, M. T., Cheung, C. C., Kerr, M., Pennucci, T., Decesar, M. E., Cognard, I., Lyne, A. G., Stappers, B. W., Freire, P. C. C., Grove, J. E., Abdo, A. A., Desvignes, G., Donato, D., Ferrara, E. C., ... Ziegler, M. (2011). Three millisecond pulsars in Fermi LAT unassociated bright sources. Astrophysical Journal Letters, 727(1 PART II).