12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room D(109/110)

[DM014] Spotting imprints of dark matter in the extragalactic gamma-ray sky with photon counts statistics

Speakers

  • Hannes ZECHLIN

Primary authors

  • Hannes ZECHLIN (Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Torino, Italy)

Co-authors

Description

Apart from known gamma-ray emitters, the extragalactic gamma-ray background (EGB) comprises emission from potentially undetected sources and may therefore serve as a valuable tool for their detection. While the classical approach of EGB decomposition manifests in combined spectral fits of individual contributions, statistical methods have recently been proven to provide an even more sensitive observable. In this contribution, we summarize recent attempts of using 1-point photon counts statistics for decomposing the EGB detected with Fermi-LAT, focusing on point-source contributions and the diffuse isotropic background contribution. Furthermore, for the first time we generalize the analysis to incorporate a potential contribution from annihilating dark matter. This allows the derivation of new competitive upper limits on the dark matter self-annihilation cross section, which are complementary to upper limits obtained with other indirect detection methods.