Journal Article

Extracting the unresolved pulsar contribution to the gamma-ray background

Alex Geringer-Sameth and Savvas M. Koushiappas

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 2, pages 1813-1824
Published in print April 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20453.x
Extracting the unresolved pulsar contribution to the gamma-ray background

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We present a statistical framework which can be used to determine the contribution of an unresolved population of pulsars to the gamma-ray background. This formalism is based on the joint analysis of photon time series over extended regions of the sky. We demonstrate the robustness of this technique in controlled simulations of pulsar populations, and show that the Fermi Gamma-ray Space Telescope can be used to detect a pulsar contribution as small as 0.1 per cent of the gamma-ray background. This technique is sensitive to pulsar populations with photon fluxes greater than ∼10−10 cm−2 s−1. The framework is extensible to arbitrarily complex searches for periodicity and can therefore be tailored to specific applications such as all-sky surveys and studies of the Galactic Centre and globular clusters.

Keywords: methods: statistical; surveys; pulsars: general; Galaxy: centre; diffuse radiation

Journal Article.  12255 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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