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2 results

  • Making baryons dark: variation of cross section with approach to equilibrium

  • Allan D Ernest, Matthew P. Collins
  • Journal:
    Proceedings of the International Astronomical Union / Volume 11 / Issue A29B / August 2015
    Published online by Cambridge University Press:
    27 October 2016, p. 739
    Print publication:
    August 2015
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  • We show that as equilibrium is approached in deep gravity wells, such as those of galactic halos, gravitational quantum theory predicts that radial particle densities ρ(r) tend toward 1/r2 profiles, and photon-baryon scattering cross sections are significantly reduced.

  • Dynamical Galactic Halos: Effect of Magnetic Field and Galactic Rotation

  • D. Breitschwerdt, H.J. Völk, V. Ptuskin, V. Zirakashvili
  • Journal:
    Symposium - International Astronomical Union / Volume 157 / 1993
    Published online by Cambridge University Press:
    19 July 2016, pp. 415-419
    Print publication:
    1993
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  • It is argued that the description of the magnetic field in halos of galaxies should take into account its dynamical coupling to the other major components of the interstellar medium, namely thermal plasma and cosmic rays (CR's). It is then inevitable to have some loss of gas and CR's (galactic wind) provided that there exist some “open” magnetic field lines, facilitating their escape, and a sufficient level of self-generated waves which couple the particles to the gas. We discuss qualitatively the topology of the magnetic field in the halo and show how galactic rotation and magnetic forces can be included in such an outflow picture.