2012/08/09 by Andi Hektor, A. Hektor, M. Raidal +5 · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle Detector Development and Performance #astro-ph.CO #astro-ph.HE #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.1208.1996
3 pages, 1 figure
arxiv created 2012/08/09 · openalex publication_date 2012/08/09 · arxiv updated 2012/08/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We search for the presence of double gamma-ray line from unassociated Fermi-LAT sources including detailed Monte Carlo simulations to study its global statistical significance. Applying the Su & Finkbeiner selection criteria for high-energy photons we obtain a similar excess over the power-law background from 12 unassociated sources. However, the Fermi-LAT energy resolution and the present low statistics does not allow to distinguish a double peak from a single one with any meaningful statistical significance. We study the statistical significance of the fit to data with Monte Carlo simulations and show that the fit agrees almost perfectly with the expectations from random scan over the sky. We conclude that the claimed high-energy gamma-ray excess over the power-law background from unassociated sources is nothing but an artifact of the applied selection criteria and no preference to any excess can be claimed with the present statistics.