Amplification of Interstellar Magnetic Fields by Supernova-driven Turbulence

作者: Dinshaw S. Balsara , Grant J. Mathews , Mordecai-Mark Mac Low , Jongsoo Kim

DOI: 10.1086/425297

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摘要: Several lines of evidence suggest that magnetic fields grow rapidly in protogalactic and galactic environments. However, mean field dynamo theory has always suggested the rather slowly, taking order a Hubble time to reach observed values. The theoretical difficulties only become worse when system high Reynolds number, as is case for discrepancy can be reconciled if fast processes amplifying could operate. Following 2001 work Balsara coworkers, we show an interstellar medium dominated by realistic energy input from supernova explosions will naturally strongly turbulent with large positive negative values kinetic helicity. Even though driven compressible motions, this Mach number flow mainly concentrated solenoidal than motions. These results stem interaction strong shocks each other turbulence they self-consistently generate our model. Moreover, also generates helicities either sign. model two characteristics dynamo: growth independent scale comparable eddy turnover time. This linear phase permits until reaches about 1% energy. At stage, astrophysical producing take over. Energetics, power spectra, statistics, structures are studied here. Shock-turbulence shown very general mechanism helicity generation amplification, applicability damped Ly? systems, protogalaxies, Galaxy, starburst galaxies, intracluster medium, molecular clouds.

参考文章(73)
Miguel A. Avillez, Dinshaw Balsara, Dinshaw Balsara, Mordecai-Mark Mac Low, Jongsoo Kim, Jongsoo Kim, The Distribution of Pressures in a Supernova-Driven Interstellar Medium arXiv: Astrophysics. ,(2001)
E. N. Parker, The generation of magnetic fields in astrophysical bodies. II - The galactic field The Astrophysical Journal. ,vol. 163, pp. 255- ,(1971) , 10.1086/150765
R.N. Manchester, Jin-Lin Han, K. Ferriere, The Spatial Energy Spectrum of Magnetic Fields in Our Galaxy The Astrophysical Journal. ,vol. 610, pp. 820- 826 ,(2004) , 10.1086/421760
Judith J. Perry, Alan M. Watson, Philipp P. Kronberg, Magnetic field strengths in high-redshift galaxies - Can the galactic dynamo be tested? The Astrophysical Journal. ,vol. 406, pp. 407- 419 ,(1993) , 10.1086/172452
Simon Prunet, Alex Lazarian, Jan A. Tauber, Pablo Fosalba, Pablo Fosalba, STATISTICAL PROPERTIES OF GALACTIC STARLIGHT POLARIZATION The Astrophysical Journal. ,vol. 564, pp. 762- 772 ,(2002) , 10.1086/324297
Rosa Murphy Williams, You‐Hua Chu, John R. Dickel, R. Chris Smith, Douglas K. Milne, P. Frank Winkler, Supernova Remnants in the Magellanic Clouds. II. Supernova Remnant Breakouts from N11L and N86 The Astrophysical Journal. ,vol. 514, pp. 798- 817 ,(1999) , 10.1086/306966
Anatoly A. Suchkov, Dinshaw S. Balsara, Timothy M. Heckman, Claus Leitherner, DYNAMICS AND X-RAY EMISSION OF A GALACTIC SUPERWIND INTERACTING WITH DISK AND HALO GAS The Astrophysical Journal. ,vol. 430, pp. 511- 532 ,(1994) , 10.1086/174427
G. B. Field, D. W. Goldsmith, H. J. Habing, Cosmic-Ray Heating of the Interstellar Gas The Astrophysical Journal. ,vol. 155, ,(1969) , 10.1086/180324
Katia Ferriere, The full alpha-tensor due to supernova explosions and superbubbles in the Galactic disk The Astrophysical Journal. ,vol. 404, pp. 162- 184 ,(1993) , 10.1086/172266