Numerical studies on the structure of the cosmic ray electron halo in starburst galaxies

Conference paper

Abstract

The structure of the cosmic ray electron halo of a starburst galaxy depends strongly on the nature of galactic wind and the configuration of the magnetic field. We have investigated these dependencies by solving numerically the propagation of electrons originating in starburst galaxies, most likely in supernova remnants. The calculations are made for several models for the galactic winds and for the configuration of the magnetic fields for comparison with observations. Our simulation of a quasi-radio halo reproduces both the extended structure of ∼9 kpc and the subtle hollow structure near the polar region of the radio halo that are observed in the starburst galaxy NGC 253. These findings suggest the existence of strong galactic wind in NGC 253.

Keywords

Cosmic ray halo Starburst galaxy Radio halo 

PACS

95.30.Dr 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [Aharonian et al., 2005]
    Aharonian, F., Akhperjanian, A.G., Bazer-Bachi, A.R., et al., HESS Collaboration: A search for very high energy γ-ray emission from the starburst galaxy NGC 253 with HESS. Astron. Astrophys. 442, 177–183 (2005) ADSCrossRefGoogle Scholar
  2. [Carilli et al., 1992]
    Carilli, C.L., Holdaway, M.A., Ho, P.T.P., De Pree, C.G.: Discovery of synchrotron-emitting halo around NGC253. Astrophys. J. Lett. 399, L59–L62 (1992) ADSCrossRefGoogle Scholar
  3. [Chevalier and Clegg, 1985]
    Chevalier, R.A., Clegg, A.W.: Wind from a starburst galaxy nucleus. Nature 317, 44–45 (1985) ADSCrossRefGoogle Scholar
  4. [Lerche and Schlickeiser, 1981]
    Lerche, I., Schlickeiser, R.: Dynamical or static radio halo–is there a galactic wind? Astrophys. Lett. 22, 161–163 (1981) ADSGoogle Scholar
  5. [Zirakashvili and Voelk, 2006]
    Zirakashvili, V.N., Voelk, H.J.: Simple model of the outflow from starburst galaxies: Application to radio observations. Astrophys. J. 636, 140–148 (2006) ADSCrossRefGoogle Scholar

Copyright information

© Springer 2007

Authors and Affiliations

  1. 1.Faculty of ScienceIbaraki UniversityMitoJapan

Personalised recommendations