Naslov
The dynamics of stars near Sgr A* and dark matter at the center and in the halo of the galaxy

Autori
Bilić, Neven ; Munyaneza, Faustin ; Tupper, Gary B. ; Viollier, Raoul D.

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Progress in Particle and Nuclear Physics, Vol. 48 (1) / Faessler, A - Oxford : Pergamon, 2002, 291-300

Skup
International School Of Physics, 23rd Course; Neutrinos In Astro, Particle And Nuclear Physics

Mjesto i datum
Erice, Italija, 18.09.2001. - 26.09.2001

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
black hole; fermion ball; Galactic center; Galactic halo

Sažetak
After a discussion of the properties of degenerate fermion balls, we analyze the orbits of the star S0-1, which has the smallest projected distance to Sgr A*, in the supermassive black hole as well as in the fermion ball scenarios of the Galactic center. It is shown that both scenarios are consistent with the data, as measured during the last six years by Genzel et al. and Ghez et al. We then consider a self-gravitating ideal fermion gas at nonzero temperature as a model for the Galactic halo. The Galactic halo of mass ~ 2 × 1012M enclosed within a radius of ~ 200 kpc implies the existence of a supermassive compact dark object at the Galactic center that is in hydrostatic and thermal equilibrium with the halo. The central object has a maximal mass of ~ 2.3 × 106M within a minimal radius of ~ 18 mpc or ~ 21 light-days for fermion masses ~ 15 keV. We thus conclude that both the supermassive compact dark object and the halo could be made of the same weakly interacting ~ 15 keV particle.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA