A NORTHERN SKY SURVEY FOR POINT-LIKE SOURCES OF EeV NEUTRAL PARTICLES WITH THE TELESCOPE ARRAY EXPERIMENT

• Published in: The Astrophysical journal Vol. 804; no. 2; pp. 1 - 11
• Main Authors: Abbasi, R. U., Abe, M., Zayyad, T. Abu, Allen, M., Anderson, 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., Honda, K., Ikeda, D., Inoue, N., Ishii, T., Ishimori, R., Ito, H., Jui, C. C. H., Kadota, K., Kakimoto, F., Kalashev, O., Kasahara, K., Kawai, H., Kawakami, S., Kawana, S., Kido, E., Kim, H. B., Kim, J. H., Kitamura, S., Kuzmin, V., Kwon, Y. J., Lundquist, J. P., Machida, K., Martens, K., Matsuda, T., Matsuyama, T., Matthews, J. N., Mukai, K., Nagasawa, K., 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., Ryu, D., Sakurai, N., Sampson, A. L., 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., Takita, M., Tanaka, H., Tanaka, K., Tanaka, M., Thomson, G. B., Tkachev, I., Tokuno, H., Troitsky, S., Tsunesada, Y., Tsutsumi, K., Uchihori, Y., Udo, S., Urban, F., Vasiloff, G., Wong, T., Yamane, R., Yamaoka, H., Yang, J., Yoshida, S., Zollinger, R., Zundel, Z.
• Format: Journal Article
• Language: English
• Published: United Kingdom The American Astronomical Society 10.05.2015
• Subjects: acceleration of particles; Arrays; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; Confidence intervals; COSMIC RADIATION; cosmic rays; EEV RANGE; NEUTRAL PARTICLES; NEUTRON FLUX; Northern sky; PHOSPHORS; Searching; surveys; TELESCOPES; Uncertainty
• ISSN: 0004-637X; 1538-4357; 1538-4357
• DOI: 10.1088/0004-637X/804/2/133

ABSTRACT We report on the search for steady point-like sources of neutral particles around 1018 eV between 2008 and 2013 May with the scintillator SD of the Telescope Array experiment. We found overall no significant point-like excess above 0.5 EeV in the northern sky. Subsequently, we also searched for coincidence with the Fermi bright Galactic sources. No significant coincidence was found within the statistical uncertainty. Hence, we set an upper limit on the neutron flux that corresponds to an averaged flux of 0.07 km−2 yr−1 for EeV in the northern sky at the 95% confidence level. This is the most stringent flux upper limit in a northern sky survey assuming point-like sources. The upper limit at the 95% confidence level on the neutron flux from Cygnus X-3 is also set to 0.2 km−2 yr−1 for EeV. This is an order of magnitude lower than previous flux measurements.