Buchumschlag

Mass composition of ultra-high energy cosmic rays from distribution of their arrival directions with the Telescope Array

Fuente: arXiv

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Bibliographische Detailangaben
Hauptverfasser:	Telescope Array Collaboration, Abbasi, R. U., Abe, Y., Abu-Zayyad, T., Allen, M., Arai, Y., Arimura, R., Barcikowski, E., Belz, J. W., Bergman, D. R., Blake, S. A., Buckland, I., Cheon, B. G., Chikawa, M., Fujii, T., Fujisue, K., Fujita, K., Fujiwara, R., Fukushima, M., Furlich, G., Globus, N., Gonzalez, R., Hanlon, W., Hayashida, N., He, H., Hibi, R., Hibino, K., Higuchi, R., Honda, K., Ikeda, D., Inoue, N., Ishii, T., Ito, H., Ivanov, D., Iwasaki, A., Jeong, H. M., Jeong, S., Jui, C. C. H., Kadota, K., Kakimoto, F., Kalashev, O., Kasahara, K., Kasami, S., Kawakami, S., Kawata, K., Kharuk, I., Kido, E., Kim, H. B., Kim, J. H., Kim, S. W., Kimura, Y., Komae, I., Kuzmin, V., Kuznetsov, M., Kwon, Y. J., Lee, K. H., Lubsandorzhiev, B., Lundquist, J. P., Matsumiya, H., Matsuyama, T., Matthews, J. N., Mayta, R., Mizuno, K., Murakami, M., Myers, I., Nagataki, S., Nakai, K., Nakamura, T., Nishio, E., Nonaka, T., Oda, H., Ogio, S., Onishi, M., Ohoka, H., Okazaki, N., Oku, Y., Okuda, T., Omura, Y., Ono, M., Oshima, A., Oshima, H., Ozawa, S., Park, I. H., Park, K. Y., Potts, M., Pshirkov, M. S., Remington, J., Rodriguez, D. C., Rott, C., Rubtsov, G. I., Ryu, D., Sagawa, H., Saito, R., Sakaki, N., Sako, T., Sakurai, N., Sato, D., Sato, K., Sato, S., Sekino, K., Shah, P. D., Shibata, N., Shibata, T., Shikita, J., Shimodaira, H., Shin, B. K., Shin, H. S., Shinto, D., Smith, J. D., Sokolsky, P., Stokes, B. T., Stroman, T. A., Takagi, Y., Takahashi, K., Takamura, M., Takeda, M., Takeishi, R., Taketa, A., Takita, M., Tameda, Y., Tanaka, K., Tanaka, M., Tanoue, Y., Thomas, S. B., Thomson, G. B., Tinyakov, P., Tkachev, I., Tokuno, H., Tomida, T., Troitsky, S., Tsuda, R., Tsunesada, Y., Udo, S., Urban, F., Warren, D., Wong, T., Yamazaki, K., Yashiro, K., Yoshida, F., Zhezher, Y., Zundel, Z.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	High Energy Astrophysical Phenomena
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_version_	1866916310225518592
author	Telescope Array Collaboration Abbasi, R. U. Abe, Y. Abu-Zayyad, T. Allen, M. Arai, Y. Arimura, R. Barcikowski, E. Belz, J. W. Bergman, D. R. Blake, S. A. Buckland, I. Cheon, B. G. Chikawa, M. Fujii, T. Fujisue, K. Fujita, K. Fujiwara, R. Fukushima, M. Furlich, G. Globus, N. Gonzalez, R. Hanlon, W. Hayashida, N. He, H. Hibi, R. Hibino, K. Higuchi, R. Honda, K. Ikeda, D. Inoue, N. Ishii, T. Ito, H. Ivanov, D. Iwasaki, A. Jeong, H. M. Jeong, S. Jui, C. C. H. Kadota, K. Kakimoto, F. Kalashev, O. Kasahara, K. Kasami, S. Kawakami, S. Kawata, K. Kharuk, I. Kido, E. Kim, H. B. Kim, J. H. Kim, J. H. Kim, S. W. Kimura, Y. Komae, I. Kuzmin, V. Kuznetsov, M. Kwon, Y. J. Lee, K. H. Lubsandorzhiev, B. Lundquist, J. P. Matsumiya, H. Matsuyama, T. Matthews, J. N. Mayta, R. Mizuno, K. Murakami, M. Myers, I. Lee, K. H. Nagataki, S. Nakai, K. Nakamura, T. Nishio, E. Nonaka, T. Oda, H. Ogio, S. Onishi, M. Ohoka, H. Okazaki, N. Oku, Y. Okuda, T. Omura, Y. Ono, M. Oshima, A. Oshima, H. Ozawa, S. Park, I. H. Park, K. Y. Potts, M. Pshirkov, M. S. Remington, J. Rodriguez, D. C. Rott, C. Rubtsov, G. I. Ryu, D. Sagawa, H. Saito, R. Sakaki, N. Sako, T. Sakurai, N. Sato, D. Sato, K. Sato, S. Sekino, K. Shah, P. D. Shibata, N. Shibata, T. Shikita, J. Shimodaira, H. Shin, B. K. Shin, H. S. Shinto, D. Smith, J. D. Sokolsky, P. Stokes, B. T. Stroman, T. A. Takagi, Y. Takahashi, K. Takamura, M. Takeda, M. Takeishi, R. Taketa, A. Takita, M. Tameda, Y. Tanaka, K. Tanaka, M. Tanoue, Y. Thomas, S. B. Thomson, G. B. Tinyakov, P. Tkachev, I. Tokuno, H. Tomida, T. Troitsky, S. Tsuda, R. Tsunesada, Y. Udo, S. Urban, F. Warren, D. Wong, T. Yamazaki, K. Yashiro, K. Yoshida, F. Zhezher, Y. Zundel, Z.
author_facet	Telescope Array Collaboration Abbasi, R. U. Abe, Y. Abu-Zayyad, T. Allen, M. Arai, Y. Arimura, R. Barcikowski, E. Belz, J. W. Bergman, D. R. Blake, S. A. Buckland, I. Cheon, B. G. Chikawa, M. Fujii, T. Fujisue, K. Fujita, K. Fujiwara, R. Fukushima, M. Furlich, G. Globus, N. Gonzalez, R. Hanlon, W. Hayashida, N. He, H. Hibi, R. Hibino, K. Higuchi, R. Honda, K. Ikeda, D. Inoue, N. Ishii, T. Ito, H. Ivanov, D. Iwasaki, A. Jeong, H. M. Jeong, S. Jui, C. C. H. Kadota, K. Kakimoto, F. Kalashev, O. Kasahara, K. Kasami, S. Kawakami, S. Kawata, K. Kharuk, I. Kido, E. Kim, H. B. Kim, J. H. Kim, J. H. Kim, S. W. Kimura, Y. Komae, I. Kuzmin, V. Kuznetsov, M. Kwon, Y. J. Lee, K. H. Lubsandorzhiev, B. Lundquist, J. P. Matsumiya, H. Matsuyama, T. Matthews, J. N. Mayta, R. Mizuno, K. Murakami, M. Myers, I. Lee, K. H. Nagataki, S. Nakai, K. Nakamura, T. Nishio, E. Nonaka, T. Oda, H. Ogio, S. Onishi, M. Ohoka, H. Okazaki, N. Oku, Y. Okuda, T. Omura, Y. Ono, M. Oshima, A. Oshima, H. Ozawa, S. Park, I. H. Park, K. Y. Potts, M. Pshirkov, M. S. Remington, J. Rodriguez, D. C. Rott, C. Rubtsov, G. I. Ryu, D. Sagawa, H. Saito, R. Sakaki, N. Sako, T. Sakurai, N. Sato, D. Sato, K. Sato, S. Sekino, K. Shah, P. D. Shibata, N. Shibata, T. Shikita, J. Shimodaira, H. Shin, B. K. Shin, H. S. Shinto, D. Smith, J. D. Sokolsky, P. Stokes, B. T. Stroman, T. A. Takagi, Y. Takahashi, K. Takamura, M. Takeda, M. Takeishi, R. Taketa, A. Takita, M. Tameda, Y. Tanaka, K. Tanaka, M. Tanoue, Y. Thomas, S. B. Thomson, G. B. Tinyakov, P. Tkachev, I. Tokuno, H. Tomida, T. Troitsky, S. Tsuda, R. Tsunesada, Y. Udo, S. Urban, F. Warren, D. Wong, T. Yamazaki, K. Yashiro, K. Yoshida, F. Zhezher, Y. Zundel, Z.
contents	We use a new method to estimate the injected mass composition of ultrahigh cosmic rays (UHECRs) at energies higher than 10 EeV. The method is based on comparison of the energy-dependent distribution of cosmic ray arrival directions as measured by the Telescope Array experiment (TA) with that calculated in a given putative model of UHECR under the assumption that sources trace the large-scale structure (LSS) of the Universe. As we report in the companion letter, the TA data show large deflections with respect to the LSS which can be explained, assuming small extra-galactic magnetic fields (EGMF), by an intermediate composition changing to a heavy one (iron) in the highest energy bin. Here we show that these results are robust to uncertainties in UHECR injection spectra, the energy scale of the experiment and galactic magnetic fields (GMF). The assumption of weak EGMF, however, strongly affects this interpretation at all but the highest energies E > 100 EeV, where the remarkable isotropy of the data implies a heavy injected composition even in the case of strong EGMF. This result also holds if UHECR sources are as rare as $2 \times 10^{-5}$ Mpc$^{-3}$, that is the conservative lower limit for the source number density.
format	Preprint
id	arxiv_https___arxiv_org_abs_2406_19286
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Mass composition of ultra-high energy cosmic rays from distribution of their arrival directions with the Telescope Array Telescope Array Collaboration Abbasi, R. U. Abe, Y. Abu-Zayyad, T. Allen, M. Arai, Y. Arimura, R. Barcikowski, E. Belz, J. W. Bergman, D. R. Blake, S. A. Buckland, I. Cheon, B. G. Chikawa, M. Fujii, T. Fujisue, K. Fujita, K. Fujiwara, R. Fukushima, M. Furlich, G. Globus, N. Gonzalez, R. Hanlon, W. Hayashida, N. He, H. Hibi, R. Hibino, K. Higuchi, R. Honda, K. Ikeda, D. Inoue, N. Ishii, T. Ito, H. Ivanov, D. Iwasaki, A. Jeong, H. M. Jeong, S. Jui, C. C. H. Kadota, K. Kakimoto, F. Kalashev, O. Kasahara, K. Kasami, S. Kawakami, S. Kawata, K. Kharuk, I. Kido, E. Kim, H. B. Kim, J. H. Kim, J. H. Kim, S. W. Kimura, Y. Komae, I. Kuzmin, V. Kuznetsov, M. Kwon, Y. J. Lee, K. H. Lubsandorzhiev, B. Lundquist, J. P. Matsumiya, H. Matsuyama, T. Matthews, J. N. Mayta, R. Mizuno, K. Murakami, M. Myers, I. Lee, K. H. Nagataki, S. Nakai, K. Nakamura, T. Nishio, E. Nonaka, T. Oda, H. Ogio, S. Onishi, M. Ohoka, H. Okazaki, N. Oku, Y. Okuda, T. Omura, Y. Ono, M. Oshima, A. Oshima, H. Ozawa, S. Park, I. H. Park, K. Y. Potts, M. Pshirkov, M. S. Remington, J. Rodriguez, D. C. Rott, C. Rubtsov, G. I. Ryu, D. Sagawa, H. Saito, R. Sakaki, N. Sako, T. Sakurai, N. Sato, D. Sato, K. Sato, S. Sekino, K. Shah, P. D. Shibata, N. Shibata, T. Shikita, J. Shimodaira, H. Shin, B. K. Shin, H. S. Shinto, D. Smith, J. D. Sokolsky, P. Stokes, B. T. Stroman, T. A. Takagi, Y. Takahashi, K. Takamura, M. Takeda, M. Takeishi, R. Taketa, A. Takita, M. Tameda, Y. Tanaka, K. Tanaka, M. Tanoue, Y. Thomas, S. B. Thomson, G. B. Tinyakov, P. Tkachev, I. Tokuno, H. Tomida, T. Troitsky, S. Tsuda, R. Tsunesada, Y. Udo, S. Urban, F. Warren, D. Wong, T. Yamazaki, K. Yashiro, K. Yoshida, F. Zhezher, Y. Zundel, Z. High Energy Astrophysical Phenomena We use a new method to estimate the injected mass composition of ultrahigh cosmic rays (UHECRs) at energies higher than 10 EeV. The method is based on comparison of the energy-dependent distribution of cosmic ray arrival directions as measured by the Telescope Array experiment (TA) with that calculated in a given putative model of UHECR under the assumption that sources trace the large-scale structure (LSS) of the Universe. As we report in the companion letter, the TA data show large deflections with respect to the LSS which can be explained, assuming small extra-galactic magnetic fields (EGMF), by an intermediate composition changing to a heavy one (iron) in the highest energy bin. Here we show that these results are robust to uncertainties in UHECR injection spectra, the energy scale of the experiment and galactic magnetic fields (GMF). The assumption of weak EGMF, however, strongly affects this interpretation at all but the highest energies E > 100 EeV, where the remarkable isotropy of the data implies a heavy injected composition even in the case of strong EGMF. This result also holds if UHECR sources are as rare as $2 \times 10^{-5}$ Mpc$^{-3}$, that is the conservative lower limit for the source number density.
title	Mass composition of ultra-high energy cosmic rays from distribution of their arrival directions with the Telescope Array
topic	High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2406.19286