INVESTIGADORES
WAHLBERG Hernan Pablo
artículos
Título:
Search for point-like sources of ultra-high energy neutrinos at the Pierre Auger Observatory and improved limit on the diffuse flux of tau neutrinos
Autor/es:
PIERRE AUGER COLLABORATION (PEDRO ABREU ET AL.). H. WAHLBERG
Revista:
The Astrophysical Journal Letters
Editorial:
IOP
Referencias:
Año: 2012 vol. 755 p. 4 - 14
ISSN:
2041-8205
Resumen:
The surface detector array of the Pierre Auger Observatory can detect neutrinos with energy E ν between 1017 eV and 1020
eV from point-like sources across the sky south of +55° and north of
65° declinations. A search has been performed for highly inclined
extensive air showers produced by the interaction of neutrinos of all
flavors in the atmosphere (downward-going neutrinos), and by the decay
of tau leptons originating from tau neutrino interactions in Earth's
crust (Earth-skimming neutrinos). No candidate neutrinos have been found
in data up to 2010 May 31. This corresponds to an equivalent exposure
of ~3.5 years of a full surface detector array for the Earth-skimming
channel and ~2 years for the downward-going channel. An improved upper
limit on the diffuse flux of tau neutrinos has been derived. Upper
limits on the neutrino flux from point-like sources have been derived as
a function of the source declination. Assuming a differential neutrino
flux k PS E 2 ν from a point-like source, 90% confidence level upper limits for k PS at the level of 5 × 107 and 2.5 × 106 GeV cm2 s1
have been obtained over a broad range of declinations from the searches
for Earth-skimming and downward-going neutrinos, respectively.