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SUMMARY:Modelling the flux distribution function of the extragalactic gamm
 a-ray background from dark matter annihilation
DTSTART;VALUE=DATE-TIME:20151027T085500Z
DTEND;VALUE=DATE-TIME:20151027T091200Z
DTSTAMP;VALUE=DATE-TIME:20260521T204244Z
UID:indico-contribution-930@indico.icrr.u-tokyo.ac.jp
DESCRIPTION:Speakers: Michael Feyereisen (University of Amsterdam)\nThe on
 e-point function (i.e.\, the isotropic flux distribution) is a complementa
 ry method to (anisotropic) two-point correlations in searches for a gamma-
 ray dark matter annihilation signature. Using analytical models of structu
 re formation and dark matter halo properties\, we compute the gamma-ray fl
 ux distribution due to annihilations in extragalactic dark matter halos\, 
 as it would be observed by the Fermi Large Area Telescope. Combining the c
 entral limit theorem and Monte Carlo sampling\, we show that the flux dist
 ribution takes the form of a narrow Gaussian of ‘diffuse’ light\, with
  an ‘unresolved point source’ power-law tail as a result of bright hal
 os. We argue that this background due to dark matter constitutes an irredu
 cible and significant background component for point-source annihilation s
 earches with galaxy clusters and dwarf spheroidal galaxies\, modifying the
  predicted signal-to-noise ratio. A study of astrophysical backgrounds to 
 this signal reveals that the shape of the total gamma-ray flux distributio
 n is very sensitive to the contribution of a dark matter component\, allow
 ing us to forecast promising one-point upper limits on the annihilation cr
 oss section. We show that by using the flux distribution at only one energ
 y bin\, one can probe the canonical cross section required for explaining 
 the relic density\, for dark matter of masses around tens of GeV.\n\nhttps
 ://indico.icrr.u-tokyo.ac.jp/event/23/contributions/930/
LOCATION: Room 2
URL:https://indico.icrr.u-tokyo.ac.jp/event/23/contributions/930/
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