Abstract
We have observed the region of the Coma cluster at 34.5 MHz with a resolution of 26 arcmin × 40 arcmin. A map of the diffuse halo (Coma C) is presented. The size of the halo is found to be 54 arcmin × 30 arcmin. The position angle is 50° ± 10° and the integrated flux is 60 ± 11 Jy.
We have also found an extended source to the south of Coma A. The measured half-power widths of this source are 30 arcmin × 40 arcmin. The position angle is 135° and the integrated flux is ~ 15 Jy at 34.5 MHz. The spectral index in the frequency range 408 to 34.5 MHz is -1.0. It is suggested that this source also belongs to the Coma cluster.
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References
Ballarati, B., Ferretti, L., Ficarra, A., Gavazzi, G., Giovannini, M., Nanni, M., Olori, M. C 1981,Astr. Astrophys.,100, 323.
Blandford, R. P., Ostriker, J. P. 1978,Astrophys. J.,221, L29.
Dennison, A. 1980,Astrophys, J.,239, L93.
Hanisch, R. J. 1980,Astr. J.,85, 1565.
Hanisch, R. J., Erickson, W. C. 1980,Astr. J.,85, 183.
Hanisch, R. J., Matthews, T. A., Davis, M. M. 1979,Astr. J.,84, 946.
Hanisch, R. J., White, R. A. 1981,Astr. J.,86, 806.
Haslam, C. G. T., Wilson, W. E., Graham, D. A, Hunt, G. C. 1974,Astr. Astrophys. Suppl. Ser.,13,359.
Helfand, D. J., Ku, W. H. -M., Abramopoulos, F. 1980, in Highlights of Astronomy, Ed. P. A. Wayman, D. Reidel, Dordrecht, p. 747.
Jaffe, W. J. 1977,Astrophys. J.,212, 1.
Jaffe, W. J., Rudnick, L. 1979,Astrophys. J.,233, 453.
Miley, G. K., Heckman, T. M., Butcher, H. R., van Breugel, W. J. M. 1981,Astrophys. J.,247, L5.
Roland, J. 1981,Astr. Astrophys.,93,407.
Schmidt, M. 1965Astrophys. J.,141, 1.
Welch, G. A., Sastry, G. M. 1971,Astrophys.].,169, L3.
Williams, P. J. S., Kenderdine, S., Baldwin, J. E. 1966,Mem. R. astr. Soc,70, 53.
Wilson, M. A. G. 1970,Mon. Not. R. astr.,151, 1.
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Sastry, C.V., Shevgaonkar, R.K. Diffuse radio emission from the Coma cluster of galaxies at decametre wavelengths. J Astrophys Astron 4, 47–51 (1983). https://doi.org/10.1007/BF02714191
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DOI: https://doi.org/10.1007/BF02714191