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For a recent survey, see R. Maartens, Pramana 55, 575 (2000);
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Maartens, R.1
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16
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33845768390
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note
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The efficiency of the first order Fermi mechanism for accelerating particles has been recently questioned (see, e.g., M. Ostrowski and J. Bednarz, astro-ph/0101069, and references therein).
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19
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Science 279, 684 (1998);
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G.E. Romero, J.A. Combi, S.E. Perez Bergliaffa, and L.A. Anchordoqui, Astropart. Phys. 5, 279 (1996).
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Romero, G.E.1
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N. Junkes, R.F. Haynes, J.I. Harnett, and D.L. Jauncey, Astron. Astrophys. 269, 29 (1993).
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33845724098
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note
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For example, an explanation of the apparent absence of a counterjet in Cen A via relativistic beaming suggests that the angle of the visible jet axis with respect to the line of sight is at most 36° [20], which could lead to a doubling of the hot spot radius. It should be remarked that for a distance of 3.4 Mpc, the extent of the entire source has a reasonable size even with this small angle.
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30
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33845729913
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note
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Simulations of the magnetic field in shock environments reveal a complex Mach disk and extended oblique shock structure. Therefore, it is necessary to consider the entire shock environment for a complete picture of particle acceleration, confinement, and transport. Semi-realistic simulations of such struc
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31
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33845786008
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P. Biermann, private communication.
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tares, which include energetic particles and magnetic fields, are just beginning to be available (P. Biermann, private communication).
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34
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0000655367
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Note that the received radiation is negligibly affected by inter-actions with the various radiation backgrounds, F.A. Aharonian, New Astron. 5, 377 (2000).
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Aharonian, F.A.1
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33845721755
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H. Steinle, astro-ph/0105482.
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H. Steinle, astro-ph/0105482.
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39
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85107712608
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note
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20 eV for 100 TeV photons.
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40
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0000739816
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See E. Waxman, Phys. Rev. Lett. 75, 386 (1995), for a nice discussion of this point in the context of GRBs.
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Waxman, E.1
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33845722193
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G.R. Farrar and T. Piran, astro-ph/0010370
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G.R. Farrar and T. Piran, astro-ph/0010370;
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45
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85107714135
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note
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zenith. The several events at declinations δ near -90° have small errors in the δ direction, and do not intersect the oval regions.
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46
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85107713555
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note
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20 eV, or lower.
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52
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33845739277
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note
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A lower cutoff on the maximum attainable energy would increase the expected event rate, and would decrease the possible observed events, leaving the bound unchanged.
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54
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0001653522
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B. Cheng, A.V. Olinto, D. Schramm, and J. Truran, Phys. Rev. D 54, 4714 (1996);
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http://ifcai.pa.cnr.it/euso.html;
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