INDICATIONS OF INTERMEDIATE-SCALE ANISOTROPY OF COSMIC RAYS WITH ENERGY GREATER THAN 57 EeV IN THE NORTHERN SKY MEASURED WITH THE SURFACE DETECTOR OF THE TELESCOPE ARRAY EXPERIMENT

By R. Abbasi, M. Abe, T. Abu-Zayyad, M. Allen, R. Anderson, R. Azuma, E. Barcikowski, J. Belz, D. Bergman, S. Blake and 115 more. 2014

289 citations recorded by the source corpus.

We have searched for intermediate-scale anisotropy in the arrival directions of ultrahigh-energy cosmic rays with energies above 57 EeV in the northern sky using data collected over a 5 yr period by the surface detector of the Telescope Array experiment. We report on a cluster of events that we call the hotspot, found by oversampling using 20° radius circles. The hotspot has a Li-Ma statistical significance of 5.1σ, and is centered at R.A. = 146.°7, decl. = 43.°2. The position of the hotspot is about 19° off of the supergalactic plane. The probability of a cluster of events of 5.1σ significance, appearing by chance in an isotropic cosmic-ray sky, is estimated to be 3.7 × 10−4 (3.4σ).

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/497a58de808cf6e4b66794f116d237728a39bb0d

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In Astronomy and Astrophysics

1. J. Biteau
2. Ralph Engel
3. Tim Huege
4. M. Unger
5. R. Ulrich
6. A. V. Vliet
7. K. Kampert
8. G. Sigl

In Nuclear and High Energy Physics

1. Tim Huege
2. K. Kampert
3. M. Unger
4. Angela V. Olinto
5. Ralph Engel
6. J. Biteau
7. R. Ulrich
8. P. Sommers

Citations in the corpus

• An Indication of Anisotropy in Arrival Directions of Ultra-high-energy Cosmic Rays through Comparison to the Flux Pattern of Extragalactic Gamma-Ray Sources (2018, background): “As noted, e.g., by Fang et al. (2014) and He et al. (2016), the excess of events observed at the Telescope Array(Abbasi et al. 2014) has some overlap with the position of M82, as well as with the position of the blazar Mkn421 that would be a bright northern source in a low-attenuation scenario.”