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1 Discovery of strong radial magnetic field and its effect New progress of radio astronomical observations near the GC was reported two years ago. The measurement of an abnormally strong radial magnetic field near the GC was reported by Eatough et al. (2013). The very important result is as follows, at r=0.12 pc in particular, the lower limit of the outward radial magnetic field near the GC is: B ≥ 8 [ RM 66.960 m−2 ] [ ne 26 cm−3 ]−1 mG. (1) It is well known that the interstellar magnetic field in the Galaxy is usually along the Galactic spiral arms, and the average strength of the magnetic field is about 1 μGauss. So the magnetic field shown in eq. (1) is abnormally strong. Plasma material of the accretion disk in the vicinity of the GC is prevented from approaching to the GC by the strong radial magnetic field, due to the magnetic freeze effect, when the kinematic energy density of the material is less than the energy density of the magnetic field, or the magnetic field is stronger than the Alphen critical value : B > BAl f en = (4πρvrot) 1/2, (2) Where is the rotation velocity of the accretion disk around the GC and ρ is the mass density. Making use of the relation vrot c = √ RS r , we then have BAl f en = [ 4πρvrot ]1/2 = { 4πnc2 NA }1/2 (RS r )1/2 ∼ 13 ( n 104 cm−3 )1/2 (RS r )1/2 Gauss, (3) where RS is the Schwarzschild radius, and the mass of the central massive object is 4.6 × 106m . at r ∼ 0.12 pc, ( RS r )1/2 = 2 × 10−3, thus, BAl f en ∼ 1.3 ( ne 26 cm−3 )1/2 mG. (4) ae-mail: qhpeng@nju.edu.cn DOI: 10.1051/ C © Owned by the authors, published by EDP Sciences, 201 / 0 0 0 (201 ) 201 epjconf EPJ Web of Conferences , 0 00 1 0 610 6

The Evidence of Invalidation of the BH model at the GC and the Existence of Magnetic Monopoles