Abstract
Radiation from an optically thick, tenuous, isothermal and magnetized plasma is considered under conditions typical for X-ray pulsars, in the approximation of coupled diffusion of normal modes. The spectra are calculated of the fluxes and specific intensities of outgoing radiation, their dependences on the plasma densityN, temperatureT and magnetic fieldB are analysed with due regard to the vacuum polarization by a strong magnetic field. Simple analytical expressions are obtained in the limiting cases for the fluxes and intensities. It is shown that atE B »E a (E B =11.6B 12 keV,E a ≃0.1N 1/222 T −3/41 keV,B 12=B/1012 G,N 22=N/1022 cm−3,T 1=T/10 keV) the magnetic field strongly intensifies the flux and changes its spectrum in the regionE a ≲E ≲E B . AtE ≲T the spectrum of the energy flux is almost flat in the region\(\sqrt {E_a E_B } \lesssim E \lesssim E_B \). For homogeneous plasma without Comptonization the cyclotron line atE≃=E B appears in emission, though in many other cases it may appear in absorption. The vacuum polarization may produce the ‘vacuum feature’ atE≃E W ≃13N 1/222 B −112 keV, which, as a rule, appears in absorption. The intensity spectra vary noticeably with the direction of radiation, in particular, at some directions nearB, the spectra become harder than in other directions. Quantization of the magnetic field (E B >T) strongly increases the plasma luminosity (∝E B /T for homogeneous plasma). The results obtained explain a number of basic features in the observed X-ray pulsar spectra.
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References
Basko, M. M.: 1976,Astrofizika 12 169.
Basko, M. M. and Sunyaev, R. A.: 1975,Astron. Astrofis. 42 311.
Becker, R. H., Rothschild, R. E., Boldt, E. A., Holt, S. S., Pravdo, S. H., Serlemitsos, P. J., and Swank, J. H.: 1978,Astrophys. J. 221, 912.
Bradt, H., Maurer, W., Buff, J., Clark, G. W., Doxsey, R., Hearn, D., Jernigan, G., Joss, P. C., Laufer, B., Lewin, W. H. G., Li, F., Matilsky, T., McClintock, J., Primini, F., Rappaport, S., and Schnopper, H.: 1976,Astrophys. J. 204, L67.
Čadež, A. and Javornik, M.: 1981,Astrophys. Space Sci. 77, 299.
Felten, J. E. and Rees, M. J.: 1972,Astron. Astrophys. 17, 226.
Gnedin, Yu. N. and Pavlov, G. G.: 1974,Soviet Phys. JETP 38, 903.
Gruber, D. E., Matteson, J. L., Nolan, P. L., Knight, F. K., Baity, W. A., Rothschild, R. E., Peterson, L. E., Hoffman, J. A., Sheepmaker, A., Wheaton, W. A., Primini, F. A., Levine, A. M., and Lewin, W. H. G.: 1980,Astrophys. J. 240, L127.
Holt, S. S. and McCray, R.: 1982,Ann. Rev Astron. Astrophys. 20, 323.
Illarionov, A. F. and Sunyaev, R. A.: 1974,Astron. Zh. 51, 698.
Ivanov, V. V.: 1969,Radiative Transfer and Spectra of Celestial Bodies (in Russian), Nauka, Moscow.
Kaminker, A. D., Pavlov, G. G., Silant'ev, N. A., and Shibanov, Yu. A.: (KPSS): 1982a,Astrofizika 18, 283. (more detailed in Preprint No. 716, A. F. Ioffe Inst. of Physics and Technology, Leningrad, 1981).
Kaminker, A. D., Pavlov, G. G., and Shibanov, Yu. A. (KPS): 1982b, Preprint No. 762, A. F. Ioffe Inst. of Physics and Technology, Leningrad;Astrophys. Space Sci. 86, 249.
Kaminker, A. D., Pavlov, G. G., and Shibanov, Yu. A.: 1983,Pis'ma Astron. Zh. 9, 108.
Kolesov, V. V.: 1977,Zh. Exp. Teor. Fiz. (JETP) 72, 1613.
Lamb, F. K., Pethic, C. J., and Pines, D.: 1973,Astrophys. J. 184, 271.
Langer, S. H., McCray, R., and Baan, W. A.: 1980,Astrophys. J. 238, 731.
Lewin, W. H. G. and Joss, P. C.: 1981,Space Sci. Rev. 28, 3.
Lieu, R.: 1981,Astrophys. Space Sci. 80, 157.
Maurer, G. S., Johnson, W. N., Kurfess, J. D., and Strickman, M. S.: 1982,Astrophys. J. 254, 271.
McClintock, J. E., Rappaport, S., Joss, P. C., Bradt, H., Buff, J., Clark, G. W., Hearn, D., Lewin, W. H. G., Matilsky, T., Mayer, W., and Primini, F.: 1976,Astrophys. J. 206, L99.
McCray, R. A., Shull, J. M., Boynton, P. E., Deeter, J. E., Holt, S. S., and White, N. E.: 1982,Astrophys. J. 262, 301.
Mészáros, P. and Bonazzola, S.: 1981,Astrophys. J. 251, 695.
Mészáros, P., Nagel, W., and Ventura, J.: 1980,Astrophys. J. 238, 1066.
Mitrofanov, I. G. and Pavlov, G. G.: 1981,Astron. Zh. 58, 309.
Mitrofanov, I. G. and Tsygan, A. I.: 1982,Astrophys. Space Sci. 84, 35.
Nagel, W.: 1980,Astrophys. J. 236, 904.
Nagel, W.: 1981a,Astrophys. J. 251, 278.
Nagel, W.: 1981b,Astrophys. J. 251, 288.
Pavlov, G. G. and Gnedin, Yu. N.: 1983, in R. A. Sunyaev (ed.),Soviet Sci. Rev.: Astrophysics and Cosmic Physics, Vol. 3, Harwood Academic Publ.
Pavlov, G. G. and Kaminker, A. D.: 1975,Pis'ma Astron. Zh. (Soviet Astron. Letters) 1, (9), 13.
Pavlov, G. G. and Panov, A. N. (PP): 1976,Soviet Phys. JETP 44, 300.
Pavlov, G. G. and Shibanov, Yu. A.: 1978,Astron. Zh. 55, 373.
Pavlov, G. G. and Shibanov, Yu. A.: 1979,Soviet Phys. JETP 49, 741.
Pavlov, G. G., Mitrofanov, I. G., and Shibanov, Yu. A.: 1980a,Astrophys. Space Sci. 73, 63.
Povlov, G. G., Shibanov, Yu. A., and Yakovlev, D. G.: 1980b,Astrophys. Space Sci. 73, 33.
Pozdnyakov, L. A., Sobol, I. M., and Sunyaev, R. A.: 1982, in R. A. Sunyaev (ed.),Soviet Sci. Rev.: Astrophysics and Cosmic Physics, Vol. 2, Harwood Academic Publ.
Pravdo, S. H.: 1979, in F. K. Lamb and D. Pines (eds.),Compact Galactic X-ray Sources, University of Illinois, p. 194.
Pravdo, S. H., Boldt, E. A., Holt, S. S., and Serlemitsos, P. J.: 1977,Astrophys. J. 216, L23.
Pravdo, S. H., Bussard, R. W., and White, N. E.: 1979a,Monthly Notices Roy. Astron. Soc. 188, 5P.
Pravdo, S. H., White, N. E., Boldt, E. A., Holt, S. S., Serlemitsos, P. J., Swank, J. H., and Szymkowiak, A. E.: 1979b,Astrophys. J. 231, 912.
Rappaport, S. A. and Joss, P. C.: 1982, in W. H. G. Lewin and E. P. J. van den Heuvel (eds.),Accretion-Driven Stellar X-ray Sources, Cambridge Univ. Press.
Ricker, G. R., Sheepmaker, A., Ballintine, J. E., Doty, J. P., Kriss, G. A., Ryckman, S. G., and Lewin, W. H. G.: 1976,Astrophys. J. 204, L73.
Rose, L. A., Pravdo, S. H., Kaluzienky, L. J., Marshall, F. E., Holt, S. S., Boldt, E. A., Rothschild, R. E., and Serlemitsos, P. J.: 1979,Astrophys. J. 231, 919.
Silant'ev, N. A.: 1980, Preprint No. 685, A. F. Ioffe Inst. Of Physics and Technology, Leningrad.
Silant'ev, N. A.: 1982,Astrophys. Space Sci. 82, 363.
Trümper, J., Peitsch, W., Reppin, C., Voges, W., Staubert, R., and Kendziorra, E.: 1978,Astrophys. J. 219 L105.
Ulmer, M. P.: 1975,Astrophys. J. 196, 27.
Ventura, J., Nagel, W., and Mészáros, P.: 1979,Astrophys. J. 233, L125.
Wasserman, I. and Salpeter, E. E.: 1980,Astrophys. J. 241, 1107.
Wheaton, W. A., Doty, J. P., Primini, F. A., Cook, B. A., Dobson, G. A., Coldman, A., Hecht, M., Hoffman, J. A., Howa, S. K., Sheepmaker, A., Tsiang, E. Y., Lewin, W. H. G., Matteson, J. L., Gruber, D. E., Baity, W. E., Rothschild, R. E., Knight, F. K., Nolan, P. and Peterson, L.E.: 1979,Nature 282, 240.
White, N. E. and Pravdo, S. H.: 1979,Astrophys. J. 233, L121.
Zeldovich, Ya. B. and Shakura, N. I.: 1969,Astron. Zh. 46, 225.
Zheleznyakov, V. V.: 1981,Astrophys. Space Sci. 77, 279.
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Kaminker, A.D., Pavlov, G.G. & Shibanov, Y.A. Spectra of radiation from a strongly magnetized plasma. Astrophys Space Sci 91, 167–214 (1983). https://doi.org/10.1007/BF00650222
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DOI: https://doi.org/10.1007/BF00650222