Naslov
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

Autori
Abreu, P. ; ... ; Antičić, Tome ; ... ; Kadija, Krešo ; ... ; Mićanović, Saša ; ... ; Šuša, Tatjana ; ... ; Ziolkowski, M.

Izvornik
Astrophysical Journal Letters (2041-8205) 755 (2012), 1; L4-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
astroparticle physics; cosmic rays; neutrinos; telescopes

Sažetak
The surface detector array of the Pierre Auger Observatory can detect neutrinos with energy E () between 10(17) eV and 10(20) 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 ~3.5years 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) ( ) from a point-like source, 90% confidence level upper limits for k (PS) at the level of -5 Oe 10(-)(7) and 2.5 Oe 10(-)(6) GeV cm(-)(2) s(-) (1) have been obtained over a broad range of declinations from the searches for Earth-skimming and downward-going neutrinos, respectively.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
The Pierre Auger Collaboration.

POVEZANOST RADA