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Gamma ray pulsars with the GLAST LAT

Abstract : The Gamma-ray Large Area Space Telescope (GLAST) will be launched less than a year from now, and its Large Area Telescope (LAT) is expected to discover scores to hundreds of gamma-ray pulsars. This poster discusses which of the over 1700 known pulsars, mostly visible only at radio frequencies, are likely to emit >100 MeV gamma-rays with intensities detectable by the LAT. The main figure of merit used to select gamma-ray pulsar candidates is sqrt(E-dot)/d2, where E-dot is the energy loss due to rotational spindown, and d is the distance to the pulsar. The figure of merit incorporates spin-down flux at earth (proportional to E-dot/d2) times efficiency, assumed proportional to 1/sqrt(E-dot). A few individual objects are cited to illustrate the issues. Since large E-dot pulsars also tend to have large timing noise and occasional glitches, their ephemerides can become inaccurate in weeks to months. To detect and study the gamma-ray emission the photons must be accurately tagged with the pulse phase. With hours to days between gamma-ray photon arrival times from a pulsar and months to years of LAT exposure needed for good detections, GLAST will need timing measurements throughout the continuous gamma-ray observations. The poster will describe efforts to coordinate pulsar timing of the candidate gamma-ray pulsars.
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http://hal.in2p3.fr/in2p3-00322836
Contributor : Ludovic Le Noan <>
Submitted on : Thursday, September 18, 2008 - 5:18:48 PM
Last modification on : Thursday, January 11, 2018 - 6:12:50 AM

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  • HAL Id : in2p3-00322836, version 1

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L. Guillemot, M. Lemoine-Goumard. Gamma ray pulsars with the GLAST LAT. XXXth ICRC, Jul 2007, Merida, Mexico. pp.855-858. ⟨in2p3-00322836⟩

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