Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Cosmic-Ray Indirect. CRI-properties of CRs at high energies (anisotropy, energy, mass)
Diffuse and targeted searches for ultra-high-energy photons using the hybrid detector of the Pierre Auger Observatory
M. Niechciol* on behalf of the Pierre Auger Collaboration
*corresponding author
Full text: pdf
Pre-published on: August 16, 2017
Published on: August 03, 2018
Abstract
Two hybrid analyses using air shower events recorded by both the Surface Detector Array (SD) and the Fluorescence Detector (FD) of the Pierre Auger Observatory are presented. In the first analysis, a search for a diffuse flux of photons with energies above $10^{18}\,\text{eV}\,=\,1\,\text{EeV}$ is performed. An unprecedented separation power between photon and hadron primaries is achieved through combining observables from both the FD and the SD. The upper limits on the photon flux determined in this analysis are the most stringent limits to date at these energies, reaching the expected flux of cosmogenic photons in some astrophysical scenarios and placing severe constraints on non-standard models for the production of UHE cosmic rays.

In the second analysis, a targeted search for EeV photon point sources is performed using several classes of galactic and extragalactic candidate objects. No significant excess of photon-like air shower events is found for any of the source candidates. The photon flux limits for selected source candidates constrain theoretical models for EeV proton production at non-transient Galactic and nearby extragalactic sources, and in particular at the Galactic center region.
DOI: https://doi.org/10.22323/1.301.0517
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