J/ApJ/790/L21 List of Telescope Array events with E > 57EeV (Abbasi+, 2014)
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.
Abbasi R.U., Abe M., Abu-Zayyad T., Allen M., Anderson R., Azuma R.,
Barcikowski E., Belz J.W., Bergman D.R., Blake S.A., Cady R., Chae M.J.,
Cheon B.G., Chiba J., Chikawa M., Cho W.R., Fujii T., Fukushima M.,
Goto T., Hanlon W., Hayashi Y., Hayashida N., Hibino K., Honda K.,
Ikeda D., Inoue N., Ishii T., Ishimori R., Ito H., Ivanov D., Jui C.C.H.,
Kadota K., Kakimoto F., Kalashev O., Kasahara K., Kawai H., Kawakami S.,
Kawana S., Kawata K., Kido E., Kim H.B., Kim J.H., Kitamura S.,
Kitamura Y., Kuzmin V., Kwon Y.J., Lan J., Lim S.I., Lundquist J.P.,
Machida K., Martens K., Matsuda T., Matsuyama T., Matthews J.N.,
Minamino M., Mukai K., Myers I., Nagasawa K., Nagataki S., Nakamura T.,
Nonaka T., Nozato A., Ogio S., Ogura J., Ohnishi M., Ohoka H., Oki K.,
Okuda T., Ono M., Oshima A., Ozawa S., Park I.H., Pshirkov M.S.,
Rodriguez D.C., Rubtsov G., Ryu D., Sagawa H., Sakurai N., Sampson A.L.,
Scott L.M., Shah P.D., Shibata F., Shibata T., Shimodaira H., Shin B.K.,
Smith J.D., Sokolsky P., Springer R.W., Stokes B.T., Stratton S.R.,
Stroman T.A., Suzawa T., Takamura M., Takeda M., Takeishi R., Taketa A.,
Takita M., Tameda Y., Tanaka H., Tanaka K., Tanaka M., Thomas S.B.,
Thomson G.B., Tinyakov P., Tkachev I., Tokuno H., Tomida T., Troitsky S.,
Tsunesada Y., Tsutsumi K., Uchihori Y., Udo S., Urban F., Vasiloff G.,
Wong T., Yamane R., Yamaoka H., Yamazaki K., Yang J., Yashiro K.,
Yoneda Y., Yoshida S., Yoshii H., Zollinger R., Zundel Z.
<Astrophys. J., 790, L21 (2014)>
=2014ApJ...790L..21A 2014ApJ...790L..21A (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Gamma rays
Keywords: acceleration of particles - cosmic rays -
large-scale structure of universe - surveys
Abstract:
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 RA = 146.°7,
DE = 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 3.7x10-4 (3.4σ).
Description:
The TA is the largest cosmic-ray detector in the northern hemisphere.
It consists of a scintillator SD array (Abu-Zayyad et al.
2012NIMPA.689...87A 2012NIMPA.689...87A) and three fluorescence detector (FD) stations
(Tokuno et al. 2012NIMPA.676...54T 2012NIMPA.676...54T). The observatory has been in full
operation in Millard Country, Utah, USA (39fdg30N, 112fdg91W; about
1400 m above sea level) since 2008. The TA SD array consists of 507
plastic scintillation detectors each 3 m2 in area and located on a 1.2
km square grid. The array has an area of ∼700 km2. The TA SD array
observes cosmic-ray-induced extensive air showers with E > ∼1 EeV,
regardless of weather conditions with a duty cycle near 100% and a
wide field of view (FoV). These capabilities ensure a very stable and
large geometrical exposure over the northern sky survey in comparison
with FD observations that have a duty cycle of ∼10%. In this analysis,
we used SD data recorded between 2008 May 11 and 2013 May 4.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 46 72 List of Telescope Array events with E >57 EeV
and zenith angle θ < 55 degrees recorded
from 2008 May 11 to 2013 May 4
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See also:
IX/36 : GRANAT/PHEBUS catalog of cosmic gamma-ray bursts (Terekhov+, 1994-2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 yr Arrival.Y Arrival Year
6- 8 A3 "month" Arrival.M Arrival Month; abbreviated
10- 11 I2 d Arrival.D Arrival Day
13- 14 I2 h Arrival.h Arrival hour; UTC
16- 17 I2 min Arrival.m Arrival minute; UTC
19- 20 I2 s Arrival.s Arrival second; UTC
22- 26 F5.2 deg Theta Zenith angle
28- 32 F5.1 EeV E Energy
34- 39 F6.2 deg RAdeg Right Ascension in decimal degrees (J2000)
41- 46 F6.2 deg DEdeg Declination in decimal degrees (J2000)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 16-Mar-2017