Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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SECONDARY ELECTRONS IN CLUSTERS OF GALAXIES AND GALAXIES

  • Published : 2004.12.01
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Abstract

We investigate the role of secondary electrons in galaxy clusters and in ultra-luminous infrared galaxies (ULIGs). The radio emission in galaxy clusters and ULIGs is believed to be produced by the synchrotron radiation of relativistic electrons. Nonetheless, the sources of these relativistic electrons are still unclear. Relativistic secondary electrons can be produced from the hadronic interactions of cosmic-ray nuclei with the intra-cluster media (ICM) of galaxy clusters and the dense molecular clouds of ULIGs. We estimate the contribution of the secondary electrons in galaxy clusters and ULIGs by comparing observational results with theoretical calculations for the radio emission in these sources. We find that the radio halos of galaxy clusters can not be produced from the secondary electrons; on the other hand, at least for some ULIGs, the radio emission can be dominated by the synchrotron emission of the secondary electrons.

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References

  1. Berezinsky, V. S., Blasi, P., & Ptuskin, V. S. 1997, ApJ, 487, 529 https://doi.org/10.1086/304622
  2. Giovannini, G., Tordi, M., & Feretti, L. 1999, NewA, 4, 141 https://doi.org/10.1016/S1384-1076(99)00018-4
  3. Hwang, C.-Y. 1997, Science, 278, 1917 https://doi.org/10.1126/science.278.5345.1917
  4. Hwang, C.-Y., & Chiou, H.-H. 2004, ApJ, 600, 52 https://doi.org/10.1086/379786
  5. Kuo, P.-H., Hwang, C.-Y., & Ip, W.-H. 2003, ApJ, 594, 732 https://doi.org/10.1086/376966
  6. Kuo, P.-H., Hwang, C.-Y., & Ip, W.-H. 2004, ApJ, 604,108 https://doi.org/10.1086/381744
  7. Sanders & Mirabel 1996, ARAA, 34, 749 https://doi.org/10.1146/annurev.astro.34.1.749
  8. Solomon, P. M., Downes, D., Radford, S. J. E., Barrett, J. W. 1997, ApJ, 478, 144 https://doi.org/10.1086/303765
  9. V$\ddot{o}$lk, H. J., Aharonian, F. A., & Breitschwerdt, D. 1996, Space Sci. Rev., 75, 279

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  2. Acceleration of primary and secondary particles in galaxy clusters by compressible MHD turbulence: from radio haloes to gamma-rays vol.410, pp.1, 2011, https://doi.org/10.1111/j.1365-2966.2010.17457.x