58895006
Neutrino signal from extended Galactic sources in IceCube
Context. The Galactic Plane is the brightest source of gamma rays in the sky. It should be also (one of the) brightest very-high-energy neutrino sources, if a neutrino flux comparable to the -ray flux is produced by the cosmic ray interactions in the interstellar medium. Aims. We explore the detectability of the neutrino flux from the entire Galactic Plane or from a part of it with IceCube. Methods. We calculate the normalization and the spectral index of the neutrino power law spectrum from di erent regions of the Galactic plane, based on the observed spectral characteristics of the pion decay -ray di use emission observed by the Fermi/LAT telescope in the energy band above 100 GeV. We compare the neutrino flux calculated in this way with the sensitivity of IceCube for the detection of extended sources. Results. Assuming a binned extended source analysis method, we find that the only possible evidence for neutrino emission for sources located in the Northern hemisphere is from the Cygnus region after 20 years of exposure. For other parts of the Galactic Plane even a 20 year exposure with IceCube is not su cient for the detection. Taking into account marginal significance of the detectable source in the Cygnus region, we find a precise position and size of the source region which optimizes the signal-to-noise ratio for neutrinos. We also calculate the low-energy threshold above which the neutrino signal could be detected with the highest signal-to-noise ratio. This calculation of precise source position, size and energy range, based on the gamma-ray data, could be used to remove the ”trial factor” in the analysis of the real neutrino data of IceCube. We notice that the di use neutrino emission from the inner Galactic Plane in the Southern Hemisphere is much brighter. A neutrino detector with characteristics equivalent to IceCube, but placed at the Northern Hemisphere (such as KM3NeT), would detect several isolated neutrino sources in the Galactic Plane within just five year exposure at 5 level. These isolated sources of TeV neutrinos would unambiguously localize sources of cosmic rays which operated over the last 10 thousand years in the Galaxy. Conclusions. The detection of the di use neutrino emission from cosmic ray interactions in the Galactic Disk is challenging, but marginally feasible with 20 yr long exposure by IceCube. Dramatically shorter (2-5 yr) exposure times would be required for the Galactic Plane signal detection with an IceCube like neutrino detector in the Northern hemisphere.
3111222
The data acquisition system for the ANTARES neutrino telescope
The ANTARES neutrino telescope is being constructed in the Mediterranean Sea. It consists of a large three-dimensional array of photo-multiplier tubes. The data acquisition system of the detector takes care of the digitisation of the photo-multiplier tube signals, data transport, data filtering, and data storage. The detector is operated using a control program interfaced with all elements. The design and the implementation of the data acquisition system are described.
209976599
Expected discovery potential and sensitivity of the ANTARES neutrino telescope to neutrino point-like sources
209872198
Search for neutrino point sources with the IceCube Neutrino Observatory
120269743
Analysis of the Optical Beacon system and search for point-like sources in the ANTARES neutrino telescope
En los ultimos anos estamos siendo testigos de la consolidacion de una nueva disciplina dentro de la astronomia y de la deteccion de rayos cosmicos, la astronomia de neutrinos, Esta tuvo su origen con la deteccion de los primeros neutrinos provenientes de una fuente extra-terrestre, el Sol. Con la deteccion de los neutrinos provenientes de la supernova SN1987A por parte del experimento Kamiokande II, se ampliaron las posibilidades de esta nueva rama de la Fisica de Astroparticulas. Ambos hechos fueron reconocidos por la comunidad cientifica y el ano 2002 el Premio Nobel de Fisica fue otorgado a Raymond Davis y Masatoshi Koshiba por sus estudios pioneros en el campo de la Astrofisica y en particular en la deteccion de neutrinos cosmicos. Esta deteccion de neutrinos solares y de supernovas, se conoce como astronomia de neutrinos de baja energia. Nuevos experimentos, como ANTARES, pretenden extender dicha disciplina de manera que sea posible detectar neutrinos en un mayor rango de energia. Una de las razones fundamentales para querer explorar el Universo usando los neutrinos como mensajeros cosmicos es que este tipo de astronomia ofrece un considerable potencial para el estudio de las regiones mas lejanas o mas densas del Cosmos. La astronomia tradicional basada en fotones ha permitido realizar importantes descubrimientos en todas las longitudes de onda del espectro electromagnetico. Sin embargo, este tipo de astronomia ha encontrado su limitacion en el hecho de que fotones con energias del orden de TeV son absorbidos por el fondo cosmico de radiacion de microondas. Esta incapacidad de poder observar el aspecto mas energetico del Universo ha propiciado que el interes cientifico se dirija hacia nuevos mensajeros cosmicos para explorar las regiones mas densas y lejanas del Universo. De entre ellos, los neutrinos, al ser neutros y solo interactuar debilmente, son los mejores candidatos debido a que no son desviados por los campos
55763273
An exploration of hadronic interactions in blazars using IceCube
Context: Hadronic models, involving matter (proton or nuclei) acceleration in blazar jets, imply high energy photon and neutrino emissions due to interactions of high-energy protons with matter and/or radiation in the source environment. Aims: This paper shows that the sensitivity of the IceCube neutrino telescope in its 40-string configuration (IC-40) is already at the level of constraining the parameter space of purely hadronic scenarios of activity of blazars. Methods: Assuming that the entire source power originates from hadronic interactions, and assuming that the models describe the data, we estimate the expected neutrino flux from blazars based on the observed gamma-ray flux by Fermi, simultaneously with IC-40 observations. We consider two cases separately to keep the number of constrainable parameters at an acceptable level: proton-proton or proton-gamma interactions are dominant. Comparing the IC-40 sensitivity to the neutrino flux expected from some of the brightest blazars, we constrain model parameters characterizing the parent high-energy proton spectrum. Results: We find that when pp interactions dominate, some constraints on the primary proton spectrum can be imposed. For instance, for the tightest constrained source 3C 454.3, the very high energy part of the spectra of blazars is constrained to be harder than E^-2 with cut-off energies in the range of Ecut >10^18 eV. When interactions of high-energy protons on soft photon fields dominate, we can find similarly tight constraints on the proton spectrum parameters. [abridged]
121968204
Non-Classical Traveling Solutions in a Nonlinear Klein Gordon Model
A model with interparticle inharmonic interaction under the Φ4 external potential is studied. Making use of the special relation of relevant parameters, in the continuous limit, it was possible to obtain various non-classical soliton solutions, specifically, compact and peak-like solutions. The solutions undergo a jump on their first derivatives at some points of the space-time manifold. These analytic solutions were obtained by considering strong restrictions on their velocities and on the jump conditions. The energy concentrated in these solutions shows in several cases a discrete spectrum.