The supernova-regulated ISM - II. The mean magnetic field

F. A. Gent*, A. Shukurov, G. R. Sarson, A. Fletcher, M. J. Mantere

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

65 Sitaatiot (Scopus)

Abstrakti

The origin and structure of the magnetic fields in the interstellar medium of spiral galaxies is investigated with 3D, non-ideal, compressible magnetohydrodynamic simulations, including stratification in the galactic gravity field, differential rotation and radiative cooling. A rectangular domain, 1 x 1 x 2 kpc(3) in size, spans both sides of the galactic mid-plane. Supernova explosions drive transonic turbulence. A seed magnetic field grows exponentially to reach a statistically steady state within 1.6 Gyr. Following Germano (1992), we use volume averaging with a Gaussian kernel to separate magnetic field into a mean field and fluctuations. Such averaging does not satisfy all Reynolds rules, yet allows a formulation of mean-field theory. The mean field thus obtained varies in both space and time. Growth rates differ for the mean-field and fluctuating field and there is clear scale separation between the two elements, whose integral scales are about 0.7 and 0.3 kpc, respectively.

AlkuperäiskieliEnglanti
SivutL40-L44
Sivumäärä5
JulkaisuMonthly Notices of the Royal Astronomical Society
Vuosikerta430
Numero1
DOI - pysyväislinkit
TilaJulkaistu - maalisk. 2013
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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