A search of the northern sky for ultra-high-energy point sources

1991 ◽  
Vol 383 ◽  
pp. L53 ◽  
Author(s):  
D. E. Alexandreas ◽  
D. Berley ◽  
S. Biller ◽  
R. L. Burman ◽  
D. R. Cady ◽  
...  
Keyword(s):  
High Energy ◽  
Point Sources ◽  
Ultra High Energy ◽  
Energy Point

scholarly journals Search for point sources of ultra-high-energy photons with the Telescope Array surface detector

2020 ◽  
Vol 492 (3) ◽  
pp. 3984-3993 ◽  
Author(s):  
R U Abbasi ◽  
M Abe ◽  
T Abu-Zayyad ◽  
M Allen ◽  
R Azuma ◽  
...  
Keyword(s):  
Point Source ◽  
Cosmic Ray ◽  
High Energy ◽  
Point Sources ◽  
Ultra High Energy ◽  
Telescope Array ◽  
Air Shower ◽  
Upper Limits ◽  
Surface Detector ◽  
Blind Search

ABSTRACT The surface detector (SD) of the Telescope Array (TA) experiment allows us to detect indirectly photons with energies of the order of 1018 eV and higher, and to separate photons from the cosmic ray background. In this paper, we present the results of a blind search for point sources of ultra-high-energy (UHE) photons in the Northern sky using the TA SD data. The photon-induced extensive air showers are separated from the hadron-induced extensive air shower background by means of a multivariate classifier based upon 16 parameters that characterize the air shower events. No significant evidence for the photon point sources is found. The upper limits are set on the flux of photons from each particular direction in the sky within the TA field of view, according to the experiment’s angular resolution for photons. The average 95 per cent confidence level upper-limits for the point-source flux of photons with energies greater than 1018, 1018.5, 1019, 1019.5 and 1020 eV are 0.094, 0.029, 0.010, 0.0073 and 0.0058 km−2yr−1, respectively. For energies higher than 1018.5 eV, the photon point-source limits are set for the first time. Numerical results for each given direction in each energy range are provided as a supplement to this paper.

Daily search for emission of ultra-high-energy radiation from point sources

1993 ◽  
Vol 405 ◽  
pp. 353 ◽  
Author(s):  
D. E. Alexandreas ◽  
G. Allen ◽  
D. Berley ◽  
S. Biller ◽  
R. L. Burman ◽  
...  
Keyword(s):  
High Energy ◽  
Point Sources ◽  
Ultra High Energy ◽  
High Energy Radiation ◽  
Energy Radiation

THE AMANDA NEUTRINO TELESCOPE

2005 ◽  
Vol 20 (14) ◽  
pp. 3096-3098 ◽  
Author(s):  
◽  
ANDREA SILVESTRI
Keyword(s):  
High Energy ◽  
Neutrino Telescope ◽  
Point Sources ◽  
South Pole ◽  
Ultra High Energy ◽  
Neutrino Detector ◽  
High Energy Neutrino ◽  
Diffuse Sources ◽  
Ultra High Energy Neutrinos ◽  
The Antarctic

We present recent results from the Antarctic Muon And Neutrino Detector Array (AMANDA), located at the South Pole in Antarctica. AMANDA-II, commissioned in 2000, is a multipurpose high energy neutrino telescope with a broad physics and astrophysics scope. We summarize the results from searches for a variety of sources of ultra-high energy neutrinos: TeV-PeV diffuse sources by measuring either muon tracks or cascades, neutrinos in excess of PeV by searching for muons traveling in the down-going direction and point sources.

Search for Ultra--High-Energy Point-Source Emission over Various Timescales

1994 ◽  
Vol 423 ◽  
pp. 714 ◽  
Author(s):  
S. Biller ◽  
D. E. Alexandreas ◽  
G. E. Allen ◽  
D. Berley ◽  
R. L. Burman ◽  
...  
Keyword(s):  
Point Source ◽  
High Energy ◽  
Ultra High Energy ◽  
Energy Point ◽  
Source Emission

scholarly journals Search for correlations of high-energy neutrinos and ultrahigh- energy cosmic rays

2019 ◽  
Vol 207 ◽  
pp. 02010 ◽  
Author(s):  
Lisa Schumacher
Keyword(s):  
Cosmic Rays ◽  
High Energy ◽  
Point Sources ◽  
Ultra High Energy ◽  
Ultrahigh Energy ◽  
Analysis Method ◽  
Hadronic Interactions ◽  
High Energy Cosmic Rays ◽  
Ice Cube ◽  
High Energy Neutrinos

The IceCube Neutrino Observatory has recently found compelling evidence for a particular blazar producing high-energy neutrinos and PeV cosmic rays, however the sources of cosmic rays above several EeV remain unidentified. It is believed that the same environments that accelerate ultra-high-energy cosmic rays (UHECRs) also produce high-energy neutrinos via hadronic interactions of lower-energy cosmic rays. Two out of three joint analyses of the Ice- Cube Neutrino Observatory, the Pierre Auger Observatory and the Telescope Array yielded hints for a possible directional correlation of high-energy neutrinos and UHECRs. These hints however became less significant with more data. Recently, an improved analysis with an approach complementary to the other analyses has been developed. This analysis searches for neutrino point sources in the vicinity of UHECRs with search windows estimated from deflections by galactic magnetic fields. We present this new analysis method for searching common hadronic sources, additionally including neutrino data measured by ANTARES in order to increase the sensitivity to possible correlations in the Southern Hemisphere.

COSMIC RAY EVIDENCE FOR PHYSICS BEYOND THE STANDARD MODEL

1990 ◽  
Vol 05 (10) ◽  
pp. 705-712
Author(s):  
G. DOMOKOS ◽  
S. KOVESI DOMOKOS
Keyword(s):  
Standard Model ◽  
Observational Data ◽  
Center Of Mass ◽  
Cosmic Ray ◽  
High Energy ◽  
Point Sources ◽  
Beyond The Standard Model ◽  
Ultra High Energy ◽  
The Standard Model ◽  
New Phenomena

Ultra high energy observational data collected during the last decade indicate an anomalous interaction of the particles emitted by some point sources in the sky. We briefly review the evidence and discuss possible explanations of the observed anomalies. The most likely interpretation is that at energies of the order of a few TeV in the Center of Mass, new phenomena begin to take place which cannot be explained within the framework of the Standard Model. Implications of such an explanation are briefly discussed.

scholarly journals The GRAND project and GRANDProto300 experiment

2019 ◽  
Vol 210 ◽  
pp. 06007
Author(s):  
Olivier Martineau-Huynh
Keyword(s):  
Cosmic Rays ◽  
Gamma Rays ◽  
High Energy ◽  
Point Sources ◽  
Ultra High Energy ◽  
Air Showers ◽  
High Energy Cosmic Rays ◽  
Complete Measurement ◽  
Neutrino Astronomy ◽  
The Universe

The Giant Array for Neutrino Detection (GRAND) is a proposal for a giant observatory of ultra-high energy cosmic particles (neutrinos, cosmic rays and gamma rays). It will be composed of twenty subarrays of 10 000 antennas each, totaling a detection area of 200 000 km2. GRAND will reach unprecedented sensitivity to neutrinos allowing to detect cosmogenic neutrinos while its sub-degree angular resolution will also make it possible to hunt for point sources and possibly start neutrino astronomy. Combined with its gigantic exposure to ultra-high energy cosmic rays and gamma rays, GRAND will be a powerful tool to solve the century-long mistery of the nature and origin of the particles with highest energy in the Universe. On the path to GRAND, the GRANDProto300 experiment will be deployed in 2020 over a total area of 200 km2. It primarly aims at validating the detection concept of GRAND, but also proposes a rich science program centered on a precise and complete measurement of the air showers initiated by cosmic rays with energies between 1016.5 and 1018 eV, a range where we expect to observe the transition between the Galactic and extra-galactic origin of cosmic rays.

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