INVESTIGADORES
MOLLERACH Maria Silvia
artículos
Título:
A search for point sources of EeV photons
Autor/es:
THE PIERRE AUGER COLLABORATION, INCLUYE S. MOLLERACH
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2014
ISSN:
0004-637X
Resumen:
Measurements of air showers made using the hybrid technique developed
with the fluorescence and surface detectors of the Pierre Auger
Observatory allow a sensitive search for point sources of EeV photons
anywhere in the exposed sky. A multivariate analysis reduces the
background of hadronic cosmic rays. The search is sensitive to a
declination band from -85° to +20°, in an energy range from
1017.3 eV to 1018.5 eV. No photon point source has
been detected. An upper limit on the photon flux has been derived for
every direction. The mean value of the energy flux limit that results
from this, assuming a photon spectral index of -2, is 0.06 eV
cm-2 s-1, and no celestial direction exceeds 0.25
eV cm-2 s-1. These upper limits constrain
scenarios in which EeV cosmic ray protons are emitted by non-transient
sources in the Galaxy.