Abstract
Cosmic-ray acceleration and transport is considered from the point of view of application to diffuse galactic γ-ray sources. As an introduction we review several source models, in particular supernovae exploding inside or near large interstellar clouds. The complex problem of cosmic ray transport in random electromagnetic fields is reduced to three cases which should be sufficient for practical purposes. As far as diffusive acceleration is concerned, apart from reviewing the basic physical principles, we point out the relation between shock acceleration and 2nd order Fermi acceleration, and the relative importance of the two processes around interstellar shock waves. For γ-ray source models the interaction of cosmic rays with dense clouds assumes great importance. Past discussions had been confined to static interactions of clouds with the ambient medium in the sense that no large scale mass motions in the ambient interstellar medium were considered. The well-known result then is that down to some tens of MeV or less, cosmic-ray nucleons should freely penetrate molecular clouds of typical masses and sizes. The self-exclusion of very low energy nucleons however may affect electron transport with consequences for the Bremsstrahlung γ-luminosity of such clouds.
In this paper we consider also the dynamical interaction of dense clouds with a surrounding hot interstellar medium. Through cloud evaporation and accretion there exist mass flows in the cloud surroundings. We argue that in the case of (small) cloud evaporation the galactic cosmic rays will be essentially excluded from the clouds. The dynamic effects of cosmic rays on the flow should be minor in this case. For the opposite case of gas accretion onto (large) clouds, cosmic-ray effects on the flow will in general be large, limiting the cosmic-ray compression inside the cloud to dynamic pressure equilibrium. This should have a number of interesting and new consequences for γ-ray astronomy. A first, qualitative discussion is given in the last section.
Proceedings of the XVIII General Assembly of the IAU: Galactic Astrophysics and Gamma-Ray Astronomy, held at Patras, Greece, 19 August 1982.
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References
Axford, W. I.: 1981a, in G. Setti, G. Spada, and A. W. Wolfendale (eds.), ‘Origin of Cosmic Rays’, IA U Symp. 94, 339.
Axford, W. I.: 1981b, Proc. 17th Int. Cosmic Ray Conf. (Paris) 12, 155.
Axford, W. I., Leer, E., and Skadron, G.: 1977, Proc. 15th Int. Cosmic Ray Conf. (Plovdiv) 11, 132.
Axford, W. I., Leer, E., and McKenzie, J. F.: 1982, Astron. Astrophys. 1ll, 317.
Balbus, S. A. and McKee, C. F.: 1982, Astrophys. J.252, 529.
Bell, A. R.: 1978a, Monthly Notices Roy. Astron. Soc. 182, 147.
Bell, A. R.: 1978b, Monthly Notices Roy. Astron. Soc. 182, 443.
Bennett, K., Bignami, G. F., Boella, G., Buccheri, R., Hermsen, W., Kanbach, G., Lichti, G. G., Masnou, J. L., Mayer-Hasselwander, H. A., Paul, J. A., Scarsi, L., Swanenburg, B. N., Taylor, B. G., and Will, R. D.: 1977, Astron. Astrophys. 61, 279.
Blandford, R. D.: 1980, Astrophys. J. 238, 410.
Blandford, R. D. and Ostriker, J. P.: 1978, Astrophys. J. Letters 221, L29.
Brown, R. L. and Marscher, A. P.: 1977, Astrophys. J. 212, 659.
Burton, W. B. and Liszt, H. S.: 1981, in G. Setti, G. Spada, and A. W. Wolfendale (eds.), ‘Origin of Cosmic Rays’, IAU Symp. 94, 227.
Casse, M. and Paul, J. A.: 1980,Astrophys. J. 237, 236.
Cesarsky, C. J.: 1980,. Rev. Astron. Astrophys.18, 289.
Cesarsky, C. J. and Volk, H. J.: 1978, Astron. Astrophys. 70, 367.
Cesarsky, C. J., Casse, M., and Paul, J. A.: 1977, Astron. Astrophys. 60, 139.
Chen, G. and Armstrong, T. P.: 1975, Proc. 14th Int. Conf. Cosmic Rays (Munich) 5, 1814.
Chevalier, R. A.: 1975, Astrophys. J. 200, 698.
Chin, Y. C. and Wentzel, D. G.: 1972, Astrophys. Space Sci. 16, 465.
Cowie, L. L. and McKee, C. F.: 1977, Astrophys. J. 211, 135.
Cowie, L. L., McKee, C. F., and Ostriker, J. P.: 1981, Astrophys. J. 247, 908.
Dalgarno, A. and McCray, R.: 1972, Ann. Rev. Astron. Astrophys. 10, 375.
Dodds, D., Strong, A. W., and Wolfendale, A. W.: 1975, Monthly Notices Roy. Astron. Soc. 171, 569.
Dolginov, A. Z.: 1980, Soviet Astron. Letters 6(2), 132.
Drury, L.O’C.: 1983, Rep. Progr. Phys., in press.
Drury, L.O’C. and Volk, H. J.: 1981, Astrophys. J. 248, 344.
Eichler, D.: 1981. Astrophys. J. 244, 711.
Ellison, D.: 1981, Ph.D. Thesis, The Catholic University of America, Washington, D.C. Fermi, E.: 1949, Phys. Rev. 75, 1169.
Garcia-Munoz, M., Mason, G. M., and Simpson, J. A.: 1977, Astrophys. J. 217, 859.
Gordon, M. A. and Burton, W. B.: 1976, Astrophys. J. 208, 346.
Graham, R. and Langer, W. D.: 1973, Astrophys. J. 179, 469.
Hartmann, R. C., Kniffen, D. A., Thompson, D. J., Fichtel, C. E., Ogelman, H. B., Tiimer, T., and Ozel, M. E.: 1979, Astrophys. J. 230, 597.
Hasselmann, K. and Wibberenz G.: 1970, Astrophys. J. 162, 1049.
Hayakawa, S.: 1952, Prog. Theor. Phys. 8, 571.
Honda, M.: 1979, Proc. 16th Int. Cosmic Ray Conf. (Kyoto) 14, 159.
Hudson, P. D.: 1965, Monthly Notices Roy. Astron. Soc. 131, 23.
Hutchinson, G. W.: 1952, Phil. Mag. 43, 847.
Jokipii, J. R.: 1966, Astrophys. J. 146, 480.
Jokipii, J. R. and Parker, E. N.: 1970, Astrophys. J. 160, 735.
Krymsky, G. F.: 1977, Dokl. Akad. Nauk SSR 234, 1306.
Kulsrud, R. M. and Cesarsky, C. J.: 1971, Astrophys. Letters 8, 189.
Kulsrud, R. M. and Pearce, W.: 1969, Astrophys. J. 156, 445.
Landau, L. D. and Lifshitz, E. M.: 1959, Fluid Mechanics, Pergamon Press, p. 329ff.
Lebrun, F. and Paul, J. A.: 1978, Astron. Astrophys. 65, 187.
Lebrun, F., Bignami, G. F., Buccheri, R., Caraveo, P. A., Hermsen, W., Kanbach, G., Mayer-Hasselwander, H. A., Paul, J. A., Strong, A. W., and Wills, R. D.: 1982, Astron. Astrophys. 107, 390.
Lee, M. A.: 1982, Geophys. Res. 87, 5063.
Lee, M. A. and Volk, H. J.: 1973, Astrophys. Space Sci. 24, 31.
Lee, M. A. and Volk, H. J.: 1975, Astrophys. J. 198, 485.
Lerche, I.: 1967, Astrophys. J. 147, 689.
Marscher, A. P. and Brown. R. L.: 1978, Astrophys. J. 221, 583.
McKee, C. F. and Cowie, L. L.: 1977, Astrophys. J. 215, 213.
McKee, C. F. and Ostriker, J. P.: 1977, Astrophys. J. 218, 148.
McKenzie, J. F. and Volk, H. J.: 1981, Proc. 17th Int. Cosmic Ray Conf. (Paris) 9, 242.
McKenzie, J. F. and Volk, H. J.: 1982, Astron. Astrophys. 116, 191.
McKenzie, J. F. and Westphal, K. O.: 1969,Planet. Space Sci. 17, 1029.
Mezger, P. G.: 1918, Astron. Astrophys. 70, 565.
Montmerle, T.: 1979, Astrophys. J. 231, 95.
Montmerle, T. and Cesarsky, C. J.: 1981, Proc. 17th Int. Cosmic Ray Conf. (Paris) 1, 173.
Morfill, G. E.: 1982, Monthly Notices Roy. Astron. Soc. 198, 583.
Morfill, G. E.: 1982, Astrophys. J. 262, 749.
Morfill, G. E. and Meyer, P.: 1981, Proc. 17th Int. Cosmic Ray Conf. (Paris) 9, 56.
Morfill, G. E, Volk, H. J., Drury, L., Forman, M., Bignami, G. F., and Caraveo, P. A.: 1981, Astrophys. J. 246, 810.
Morrison, P.: 1958, Nuovo Cimento VII, Nr. 6, p. 858.
Parker, E. N.: 1963, Interplanetary Dynamic Processes, Interscience Pubi, New York, London, p. 165.
Parker, E. N.: 1968, in B. M. Middlehurst and L. A. Aller (eds.), Stars and Stellar Systems, Vol. VII: ‘Nebulae and Interstellar Matter’, The University of Chicago Press, p. 707ff.
Parker, E. N.: 1969, Space Sci. Rev. 9, 651.
Pension, M. V. and Brown, F. E.: 1970, Monthly Notices Roy. Astron. Soc. 150, 373.
Sagdeev, R. Z. and Galeev, A. A.: 1969, Nonlinear Plasma Theory, W. A. Benjamin, Inc., New York.
Salvati, M. and Massaro, E.: 1978, Astron. Astrophys. 67, 55.
Scott, J. S. and Chevalier, R. A.:1915, Astrophys. J. 197, L5.
Scoville, N. Z. and Solomon, P. M.: 1975, Astrophys. J. 199, L105.
Sedov, L. I.: 1959, Similarity and Dimensional Methods in Mechanics, Academic Press, New York.
Shull, J. M.: 1980, Astrophys. J. 237, 769.
Skilling, J., 1971, Astrophys. J. 170, 265.
Skilling, J.: 1975, Monthly Notices Roy. Astron. Soc. 172, 557.
Skilling, J. and Strong, A. W.: 1976, Astron. Astrophys. 53, 253.
Solomon, P. M., Scoville, N. Z., and Sanders, D. B.: 1979, Astrophys. J. Letters 232, L89.
Stecker, F. W.: 1971, Cosmic Gamma Rays, NASA SP-249, p. 106ff.
Swanenburg, B. N., Bennett, K., Bignami, G. F., Caraveo, P., Hermsen, W., Kanbach, G., Masnou, J. L., Mayer-Hasselwander, H. A., Paul, J. A., Sacco, B., Scarsi, L., and R. D. Wills: 1978, Nature IIS, 298.
Tenorio-Tagle, G.: 1979, Astron. Astrophys. 71, 59.
Terawasa, T.: 1979, Planet. Space Sci. 27, 193.
Toptyghin, I. N.: 1980, Space Sci. Rev. 26, 157.
Vasilyev, V. N., Toptyghin, I. N., and Chirkov, A. G.: 1980, Kosmissled.18,556 (English translation in Cosm. Res. 18, 401).
Volk, H. J.: 1981, Izv. AN SS SR, Ser. fiz.45, No. 7, (in Russian), p. 1122 (English translation: Bull. Acad. Sci. USSR, Phys. Ser.45, No. 7, p. 1, Allerton Press Inc.).
Volk, H. J. and Forman, M. A.: 1982, Astrophys. J. 253, 188.
Volk, H. J., Morfill, G. E., Alpers, W., and Lee, M. A.: 1974, Astrophys. Space Sci. 26, 403.
Volk, H. J., Forman, M. A., and Morfill, G. E.: 1981, Astrophys. J. 249, 161.
Webb, G. M.: 1983a, to appear in Astron. Astrophys.
Webb, G. M.: 1983b, to appear in Astrophys. J.
Wentzel, D. G.: 1968, Astrophys. J. 152, 987.
Wentzel, D. G.: 1974, Rev. Astron. Astrophys. 12, 71.
Wheeler, J. C., Mazurek, T. J., and Sivaramakrishnan, A.: 1980, Astrophys. J. 237, 781.
Zel’dovich, Ya. B. and Pikel’ner, S. B.: 1969, J. Eksp. Theor. Phys. 29, 170.
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Völk, H.J. (1983). Cosmic-Ray Acceleration and Transport, and Diffuse Galactic γ-Ray Emission. In: Morfill, G.E., Buccheri, R. (eds) Galactic Astrophysics and Gamma-Ray Astronomy. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7208-7_2
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