New Approach to Sgr A Problem.pdf

a r X i v : a s t r o - p h / 0 2 0 1 3 1 6 v 1 1 8 J a n 2 0 0 2 New Approach to Sgr A* Problem L.V.Verozub Kharkov National University February 1, 2008 Abstract The hypothesis that radiation of Sgr A* is caused by accretion onto a supermassive compact object without the events horizon is studied. The main equations of the accretion and a relativistic equation of the trasfer radiation are obtained. The synchrotron spectrum in the vicinity of the maximum is considered. 1 Introduction An analysis of stars motion in the dynamic center of the Galaxy gives evi- dences for the existence of a supermassive (2.6 · 106M⊙ ) compact object .( See reviews [1], [2]). There are three kinds of explanation of the observed perculiarity of the object: 1.The gas accretion onto the central object - a supermassive black hole. 2. The ejection of the magnetized plasma from the vicinity of the Schwarzshild radius of the above object. 3. The explanations are based on some hypotheses about another nature of the central objects (neutrino ball, boson stars). In the present paper we begin an investigation of the assumption that the radiation of Sgr A* is conditioned by a spherically symmetric accretion onto a supermassive compact object without the events horizon. The possibility of the existence of such a kind of objects follows [3], [4] from our gravitation equations [5]. This is a stable configuration of the Fermi-gas with radius R less than the Schwarzshild radius rg ( R is about 0.04 rg for the mass 2.6 · 106M⊙) which unlike a black hole has no the events horizon. It was shown earlier [6] that the accretion onto objects of this kind does not contradict the low observed bolometric luminosity of Sgr A* ( 1037 erg/s ). 1 The spectrum of the radiation near its maximum ( 1013 ÷1014 Hz ), that supposedly comes from the vicinity of the object surface, is obtained. It follows from the results that the analyzed model can be considered as one of the explanation of Sgr A* radiation. 2 Accretion