Motion of stars near the galactic center
Boshkayev K. Konysbayev T. Kurmanov E. Luongo O. Muccino M. Quevedo H. Taukenova A. Urazalina A. Zhumakhanova G.
22 December 2021al-Farabi Kazakh State National University
International Journal of Mathematics and Physics
2021#12Issue 279 - 86 pp.
We investigate the motion of stars at the central region of the Milky Way Galaxy. We consider two possible scenarios: 1) there is a supermassive black hole without dark matter distribution and 2) there is a dark matter core without any black hole in the galactic center. We remark that, with current observations, one cannot distinguish the two separate cases from each other at distances larger than 100 astronomical units. Here, we present improved analyses regarding the motion of stars and show that differences between these two cases appear at distances smaller than 30 astronomical units. We adopt here the so-called exponential density profile for dark matter distribution which is usually used to explain the rotation curve data points in the bulge of galaxies. For simplicity, all computations have been performed within the Newtonian gravity though the effects of general relativity become more pronounced close to the center of the galaxy in the presence of the supermassive black hole without dark matter. We underline our outcomes are model-dependent, i.e. they depend on the choice of the particular dark matter model employed for the analysis.
black hole , dark matter , exponential density (sphere) profile , motion of stars
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National Nanotechnology Laboratory of Open Type (NNLOT), Almaty, Kazakhstan
Al-Farabi Kazakh National University, Almaty, Kazakhstan
Nazarbayev University, Nur-Sultan, Kazakhstan
ICRANet, della Repubblica 10, Pescara, I-65122, Italy
Scuola di Scienze e Tecnologie, Universita di Camerino, Via Madonna delle Carceri 9, Camerino, 62032, Italy
Universita di Pisa, Largo B. Pontecorvo 5, Pisa, 56127, Italy
Istituto Nazionale di Fisica Nucleare (INFN), Frascati, 00044, Italy
Universidad Nacional Autonoma de Mexico, Mexico
Universita di Roma “La Sapienza”, Roma, Italy
National Center of Science and Technology Evaluation, Almaty, Kazakhstan
National Nanotechnology Laboratory of Open Type (NNLOT)
Al-Farabi Kazakh National University
Nazarbayev University
ICRANet
Scuola di Scienze e Tecnologie
Universita di Pisa
Istituto Nazionale di Fisica Nucleare (INFN)
Universidad Nacional Autonoma de Mexico
Universita di Roma “La Sapienza”
National Center of Science and Technology Evaluation
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