Effects of non-vanishing dark matter pressure in the Milky Way Galaxy
Boshkayev K. Konysbayev T. Kurmanov E. Luongo O. Malafarina D. Mutalipova K. Zhumakhanova G.
1 November 2021Oxford University Press
Monthly Notices of the Royal Astronomical Society
2021#508Issue 11543 - 1554 pp.
We consider the possibility that the Milky Ways dark matter halo possesses a non-vanishing equation of state. Consequently, we evaluate the contribution due to the speed of sound, assuming that the dark matter content of the galaxy behaves like a fluid with pressure. In particular, we model the dark matter distribution via an exponential sphere profile in the galactic core, and inner parts of the galaxy whereas we compare the exponential sphere with three widely used profiles for the halo, i.e. the Einasto, Burkert and Isothermal profile. For the galactic core, we also compare the effects due to a dark matter distribution without black hole with the case of a supermassive black hole in vacuum and show that present observations are unable to distinguish them. Finally we investigate the expected experimental signature provided by gravitational lensing due to the presence of dark matter in the core.
dark matter , equation of state , gravitational lensing: weak
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National Nanotechnology Laboratory of Open Type, Al-Farabi ave. 71, Almaty, 050040, Kazakhstan
Al-Farabi Kazakh National University, Al-Farabi ave. 71, Almaty, 050040, Kazakhstan
Department of Physics, Nazarbayev University, 53 Kabanbay Batyr, Nur-Sultan, 010000, Kazakhstan
Scuola di Scienze e Tecnologie, Università di Camerino, Via Madonna delle Carceri 9, Camerino, 62032, Italy
Dipartimento di Matematica, Università di Pisa, Largo B. Pontecorvo 5, Pisa, 56127, Italy
National Nanotechnology Laboratory of Open Type
Al-Farabi Kazakh National University
Department of Physics
Scuola di Scienze e Tecnologie
Dipartimento di Matematica
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