Abstract
Recent observational evidence indicates that the center of our Milky Way harbours a super-massive object with ultra-strong radial magnetic field (Eatough et al., 2013). Here we demonstrate that the radiations observed in the vicinity of the Galactic Center (GC) (Falcke and Marko 2013) cannot be emitted by the gas of the accretion disk since the accreting plasma is prevented from approaching to the GC by the abnormally strong radial magnetic field. These fields obstruct the infalling accretion flow from the inner region of the disk and the central massive black hole in the standard model. It is expected that the observed radiations near the Galactic Center cannot be generated by the central black hole. We also demonstrate that the observed ultra-strong radial magnetic field near the Galactic Center ( Eatough et al., 2013) cannot be generated by the - turbulence dynamo mechanism of Parker since preliminary qualitative estimate in terms of this mechanism gives a magnetic field strength six orders of magnitude smaller than the observed field strength at . However, both these difficulties or the dilemma of the standard model can be overcome if the central black hole in the standard model is replaced by a supper-massive stellar object containing magnetic monopoles ( SMSOMM, Peng and Chou, 2001). The observed power peaking of the thermal radiation is essentially the same as our theoretical prediction. In addition, the discovery of the ultra-strong radial magnetic field near the Galactic Center can be naturally explained and is consistent with the prediction of our model( Peng and Chou 2001). Furthermore, the observed ultra-strong radial magnetic field in the vicinity of the Galactic Center may be considered as the astronomical evidence for the existence of magnetic monopoles as predicted by the Grand Unified Theory of particle physics.
Highlights
It is generally believed that bright quasars observed at large red-shift are supermassive and rapidly spinning black holes formed in the primordial universe
We have demonstrated that the radiations observed in the contiguous region of the central black hole cannot be emitted by the gas of the disk since the accreting plasma is prevented from approaching to the Galactic Center (GC) by the ultrastrong magnetic fields
We have shown that the observed strong radial magnetic fields near the GC by Eatough et al (2013), cannot be generated by the α-turbulence dynamo mechanism of Parker because qualitative estimate gives a magnetic field strength six orders of magnitude smaller than the observed field strength at r = 0.12 pc
Summary
It is generally believed that bright quasars observed at large red-shift are supermassive and rapidly spinning black holes formed in the primordial universe. The spectacularly huge luminosity is supplied by the black hole and the surrounding accretion disk In such models, magnetic fields play a very important role. It is well established that the transfer of energy and angular momentum in such a rotating black hole and accretion disk system with magnetic coupling can generate relativistic jet by the mechanism of Blandford and Znajek (1977) if the energy source is the spinning black hole. Good agreement with observations may be achieved if the central black hole of the standard model is replaced by a supermassive stellar object containing magnetic monopoles (Peng and Chou 2001). In these model, the production of the strong radial magnetic fields can be naturally explained.
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