Data Centre for Astrophysics
Astronomy Department of the University of Geneva
ISDC Seminar

Wednesday, 28 March 2018 at 14:00

David Smith
CENBG Bordeaux

Gamma Phase-folding a Thousand Pulsars

Abstract. In its 10th year on orbit, the Fermi LAT continues to discover GeV gamma-rays from over 20 pulsars per year. The most sensitive way to find them is to use rotation ephemerides to "phase fold" the gamma photons, to then look whether the resulting phase histogram is flat or not. We are currently doing this for over a thousand radio pulsars, using ephemerides provided by the Parkes, Jodrell Bank, and Nancay radio telescopes. I will present a dozen gamma-ray pulsars found in 2017, and explain how they enhance the sample of over 200 pulsars we already had. I will discuss possible causes of the gamma-ray "deathline" near a spindown power of Edot ~ few 1E33 erg/s. Finally, I will say some words about extrapolating the observed gamma-ray pulsar population to estimate the contribution of unresolved pulsars to the diffuse background.

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