Hostname: page-component-5c6d5d7d68-thh2z Total loading time: 0 Render date: 2024-08-19T03:32:07.695Z Has data issue: false hasContentIssue false
  • English
  • Français

Radio Emission From Snr 1987A1

Published online by Cambridge University Press:  12 April 2016

J. G. Kirk ,
P. Duffy  and
Lewis Ball
J. G. Kirk
Affiliation:
Max-Planck-Institut für Kernphysik, W-6900 Heidelberg, Germany
P. Duffy
Affiliation:
Max-Planck-Institut für Kernphysik, W-6900 Heidelberg, Germany
Lewis Ball
Affiliation:
Research Centre for Theoretical Astrophysics, University of Sydney, N.S.W. 2006, Australia

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Diffusive acceleration of electrons by the blast wave of SNR 1987A is shown to provide a reasonable fit to observations of the radio emission since it reappeared in 1990 July. As well as determining the diffusion coefficient in this model, the observations indicate that the compression ratio of the gas subshock embedded in the blast wave is ~2.7, much lower than the value of 4 expected of a strong shock front. We propose that protons accelerated by the shock front itself cause the weakening of the subshock by both heating and accelerating the upstream plasma, producing a structure with a precursor to the gas subshock. Preliminary calculations using a fluid model for the energetic particle population indicate that these effects can significantly weaken the subshock just a few years after the explosion, if the same rate of particle injection is assumed as in other models of the acceleration of cosmic rays.

Subject headings: acceleration of particles — ISM: individual (SNR 1987 A) — radio continuum: ISM — shock waves

Type
Pulsars, Supernovae, and Supernova Remnants
Information
International Astronomical Union Colloquium , Volume 142: Particle Acceleration Phenomena in Astrophysical Plasmas , 1994 , pp. 807 - 811
Copyright
Copyright © The American Astronomical Society 1994

Footnotes

1

Invited contribution presented at IAU Colloquium 142, College Park, 1993 January.

References

Abramowitz, M., & Stegun, I.E. 1972, Handbook of Mathematical Functions (Washington, DC: NBS)Google Scholar
Axford, W.I. 1981, Proc. 17th. Internat. Cosmic Ray Conf. (Paris), 12, 155 Google Scholar
Ball, L.T., & Kirk, J.G. 1992, ApJ, 396, L42 Google Scholar
Bell, A.R. 1978, MNRAS, 182, 147 CrossRefGoogle Scholar
Bogdan, T.J., & Völk, H.J. 1983, A&A, 122, 129 Google Scholar
Drury, L.O’C. 1983, Rep. Progr. Phys., 46, 973 Google Scholar
Drury, L.O’C. 1991, MNRAS, 251, 340 Google Scholar
Drury, L.O’C., Markiewicz, W.J., & Völk, H.J. 1989, A&A, 225, 179 Google Scholar
Duffy, P. 1992, A&A, 262, 281 Google Scholar
Ellison, D.C., & Reynolds, S.P. 1991, ApJ, 382, 242 Google Scholar
Jones, T.W., & Kang, H. 1992, ApJ, 396, 575 Google Scholar
Kang, H., & Jones, T.W. 1991, MNRAS, 249, 439 Google Scholar
Kirk, J.G., & Wassmann, M. 1992, A&A, 254, 167 Google Scholar
McKenzie, J.F., & Völk, H.J. 1982, A&A, 116, 191 Google Scholar
Staveley-Smith, L., et al. 1992, Nature, 355, 147 CrossRefGoogle Scholar
Staveley-Smith, L., 1993, Proc. Astron. Soc. Australia in pressGoogle Scholar
Toptygin, I.N. 1980, Space Sci. Rev., 26, 157 Google Scholar
Turtle, A.J., et al. 1987, Nature, 327, 38 Google Scholar
VÖlk, H.J., Drury, L.O’C., Duffy, P., & Markiewicz, W.J. 1991, Proc. 22d Internat. Cosmic Ray Conf. (Dublin), 2, 205 Google Scholar
Völk, H.J., Drury, L.O’C., & McKenzie, J.F. 1984, A&A, 130, 19 Google Scholar
Zank, G.P., Webb, G.M., Donohue, D.J. 1992, in AIP Conf. Proc. 264, Particle Acceleration in Cosmic Plasmas, ed. Zank, G.P. & Gaisser, T.K. (New York: AIP) 158 Google Scholar