Univers Service Of Physique Des Particules

Gif-sur-Yvette, France

Univers Service Of Physique Des Particules

Gif-sur-Yvette, France
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Adrian-Martinez S.,Polytechnic University of Valencia | Albert A.,Institut Universitaire de France | Andre M.,University of Barcelona | Anghinolfi M.,National Institute of Nuclear Physics, Italy | And 151 more authors.
Astrophysical Journal Letters | Year: 2014

A search for cosmic neutrino sources using six years of data collected by the ANTARES neutrino telescope has been performed. Clusters of muon neutrinos over the expected atmospheric background have been looked for. No clear signal has been found. The most signal-like accumulation of events is located at equatorial coordinates R.A. =-46.°8 and decl. =-64.°9 and corresponds to a 2.2σ background fluctuation. In addition, upper limits on the flux normalization of an E -2 muon neutrino energy spectrum have been set for 50 pre-selected astrophysical objects. Finally, motivated by an accumulation of seven events relatively close to the Galactic Center in the recently reported neutrino sample of the IceCube telescope, a search for point sources in a broad region around this accumulation has been carried out. No indication of a neutrino signal has been found in the ANTARES data and upper limits on the flux normalization of an E -2 energy spectrum of neutrinos from point sources in that region have been set. The 90% confidence level upper limits on the muon neutrino flux normalization vary between 3.5 and 5.1 × 10 -8 GeV cm-2 s-1, depending on the exact location of the source. © 2014. The American Astronomical Society. All rights reserved.


Adrian-Martinez S.,Polytechnic University of Valencia | Al Samarai I.,Aix - Marseille University | Albert A.,Institut Universitaire de France | Andre M.,University of Barcelona | And 175 more authors.
Astrophysical Journal | Year: 2012

In this paper, a time-integrated search for point sources of cosmic neutrinos is presented using the data collected from 2007 to 2010 by the ANTARES neutrino telescope. No statistically significant signal has been found and upper limits on the neutrino flux have been obtained. Assuming an E -2 ν spectrum, these flux limits are at 1-10 ×10-8GeVcm-2s-1 for declinations ranging from -90° to 40°. Limits for specific models of RXJ1713.7-3946 and Vela X, which include information on the source morphology and spectrum, are also given. © 2012. The American Astronomical Society. All rights reserved.

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