Anisotropy and Corotation of Galactic Cosmic Rays
Abstract
The intensity of Galactic cosmic rays is nearly isotropic because of the influence of magnetic fields in the Milky Way. Here, we present two-dimensional high-precision anisotropy measurement for energies from a few to several hundred teraelectronvolts (TeV), using the large data sample of the Tibet Air Shower Arrays. Besides revealing finer details of the known anisotropies, a new component of Galactic cosmic ray anisotropy in sidereal time is uncovered around the Cygnus region direction. For cosmic-ray energies up to a few hundred TeV, all components of anisotropies fade away, showing a corotation of Galactic cosmic rays with the local Galactic magnetic environment. These results have broad implications for a comprehensive understanding of cosmic rays, supernovae, magnetic fields, and heliospheric and Galactic dynamic environments.
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References and Notes
1
H. J. Voelk, in Frontiers of Cosmic Ray Science, T. Kajita, Y. Asaoka, A. Kawachi, Y. Matsubara, M. Sasaki, Eds. (Universal Academy Press, Tokyo, 2003), pp. 29–48.
2
Y.-Q. Lou, Astrophys. J.428, L21 (1994).
3
A. Dar, Nuovo Cim. B120, 767 (2005).
4
C. Yu, Y.-Q. Lou, F. Y. Bian, Y. Wu, Mon. Not. R. Astron. Soc.370, 121 (2006).
5
A. D. Erlykin, A. W. Wolfendale, Astropart. Phys.25, 183 (2006).
6
G. F. Krymsky, Geomagn. Aeron.977, 763 (1964).
7
E. N. Parker, Planet. Space Sci.13, 9 (1965).
8
B. Heber, in Proc. 27th Int. Cosmic Ray Conf., M. Simon, E. Lorenz, M. Pohl, Eds., Invited, Rapporteur and Highlighted papers (CDROM, 2002) pp. 118–135.
9
A. H. Compton, I. A. Getting, Phys. Rev.47, 817 (1935).
10
D. J. Cutler, D. E. Groom, Nature322, L434 (1986).
11
M. Amenomori et al., Phys. Rev. Lett.93, 061101 (2004).
12
K. Nagashima, S. Mori, in Proc. Int. Cosmic Ray Symp. on High Energy Cosmic Ray Modulation, Univ. of Tokyo, Tokyo, Japan, 326 (1976).
13
K. Nagashima, K. Fujimoto, R. M. Jacklyn, J. Geophys. Res.103, 17429 (1998).
14
K. Munakata et al., Phys. Rev.D56, 23 (1997).
15
M. Ambrosio et al., Phys. Rev.D67, 042002 (2003).
16
M. Agliettaet al., in Proc. 28th Int. Cosmic Ray Conf., T. Kajita, Y. Asaoka, A. Kawachi, Y. Matsubara, M. Sasaki, Eds., (Universal Academy Press, Tokyo, 2003) 4, pp. 183–186.
17
T. Antoni et al., Astrophys. J.604, 687 (2004).
18
G. Guillianet al., Phys. Rev. D, in press (see http://arxiv.org/astro-ph/0508468).
19
M. Amenomori et al., Astrophys. J.626, L29 (2005).
20
D. L. Hall et al., J. Geophys. Res.103, 367 (1998).
21
D. L. Hall et al., J. Geophys. Res.104, 6737 (1999).
22
M. L. Duldig, PASA18 (1), 12 (2001).
23
M. Amenomori et al., Phys. Rev. Lett.69, 2468 (1992).
24
M. Amenomoriet al., in International Symposium on High Energy Gamma-Ray Astronomy, F. A. Aharonian, H. J. Voelk, Eds., AIP Conf. Proc.558, 557 (2001).
25
M. Amenomoriet al., in Proc. 27th Int. Cosmic Ray Conf., M. Simon, E. Lorenz, M. Pohl, Eds. (Copernicus Gesellschaft, 2002), 2, pp. 573–576.
26
M. Amenomori et al., Phys. Rev.D47, 2675 (1993).
27
M. Amenomori et al., Astrophys. J.598, 242 (2003).
28
M. Amenomori et al., Nucl. Instrum. Methods Phys. Res. A288, 619 (1990).
29
30
M. Amenomori et al., Astrophys. J.633, 1005 (2005).
31
F. A. Aharonianet al., A & A393, L37 (2002).
32
S. D. Hunter et al., Astrophys. J.481, 205 (1997).
33
R. Atkins et al., Phys. Rev. Lett.95, 251103 (2005).
34
G. Walker, R. Atkins, D. Kieda, Astrophys. J.614, L93 (2004).
35
L. Bergamascoet al., in Proc. 21th Int. Cosmic Ray Conf. (Adelaide), 6, 372–375 (1990).
36
E. N. Parker, Astrophys. J.145, 811 (1966).
37
Z. H. Fan, Y.-Q. Lou, Nature383, 800 (1996).
38
Y.-Q. Lou, Z. H. Fan, Mon. Not. R. Astron. Soc.341, 909 (2003).
39
Y.-Q. Lou, X. N. Bai, Mon. Not. R. Astron. Soc., in press, astro-ph/0607328 (2006).
40
41
The collaborative experiment of the Tibet Air Shower Arrays has been performed under the auspices of the Ministry of Science and Technology of China and the Ministry of Foreign Affairs of Japan. This work was supported in part by Grants-in-Aid for Scientific Research on Priority Areas (712) (MEXT), by the Japan Society for the Promotion of Science, by the National Natural Science Foundation of China, and by the Chinese Academy of Sciences. The authors thank J. KoÌta for reading the manuscript and for critical comments.
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Science
Volume 314 | Issue 5798
20 October 2006
20 October 2006
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American Association for the Advancement of Science.
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Received: 23 June 2006
Accepted: 22 September 2006
Published in print: 20 October 2006
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