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The spatial energy spectrum of magnetic fields in our Galaxy | | J.L. Han
; K. Ferriere
; R. N. Manchester
; | | Date: |
11 Apr 2004 | | Journal: | Astrophys.J. 610 (2004) 820-826 DOI: 10.1086/421760 | | Subject: | astro-ph | | Affiliation: | NAOC), K. Ferriere (Observatoire Midi-Pyrénées, France), R. N. Manchester (ATNF | | Abstract: | Interstellar magnetic fields exist over a broad range of spatial scales, extending from the large Galactic scales ($sim 10$ kpc) down to the very small dissipative scales ($ll 1$ pc). In this paper, we use a set of 490 pulsars distributed over roughly one third of the Galactic disk out to a radius $R simeq 10$ kpc (assuming $R_odot = 8.5$ kpc) and combine their observed rotation and dispersion measures with their estimated distances to derive the spatial energy spectrum of the Galactic interstellar magnetic field over the scale range $0.5 - 15$ kpc. We obtain a nearly flat spectrum, with a 1D power-law index $alpha=-0.37pm0.10$ for $E_{
m B}(k)=C k^{alpha}$ and an rms field strength of approximately $6 mu$G over the relevant scales. Our study complements the derivation of the magnetic energy spectrum over the scale range $0.03 - 100$ pc by citet{ms96b}, showing that the magnetic spectrum becomes flatter at larger scales. This observational result is discussed in the framework of current theoretical and numerical models. | | Source: | arXiv, astro-ph/0404221 | | Services: | Forum | Review | PDF | Favorites | |
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