Galactic Magnetism with SKA: Primordial Origin of BSS, ASS, Ring &Vertical Fields Y. Sofue1,2, M. Machida3, T. Kudoh3, H. Nakanishi1 (1. Kagoshima U.,

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Galactic Magnetism with SKA: Primordial Origin of BSS, ASS, Ring &Vertical Fields Y. Sofue1,2, M. Machida3, T. Kudoh3, H. Nakanishi1 (1. Kagoshima U., 2. U .Tokyo, 3.NAOJ) Abstract Observations indicate S (BSS, bisymmetric Spiral), A (ASS, axisymmetric) , R (Ring) fields in galaxy disks, and V (Vertical) field in the center, which accelerates cosmic jets. The magnetic topology is explained as the fossil of large scale primordial field wound up during the galaxy formation. MHD simulations successfully reproduce the field configurations. In order to clarify the primordial-origin scenario, we propose high-resolution and sensitivity Faraday mapping of magnetic fields in spiral galaxies, especially the connection of S, A, R to the central V field. 1. Observations: S, A, R, V fields in spiral galaxies (a) + GC M51 B field M81 B M31 B GC (Radio Arc) NGC253 (Helical dust jets, HST ) 2. Primordial origin for S, A, R, & V fields (b,c) 3. Three-D MHD Simulation (c) i=0, 45, 89, 90 deg, 10 kpc disk B S (BSS) R (Ring) t ↓ V A (ASS) SV V SRV B2 References: (a) Beck’s url, Sofue’s url; (b) Sofue et al. 1986 ARAA 24, 459; (c) Sofue et al. 2009 in prepa.