Galactic orbits of selected companions of the Milky Way
- Авторлар: Bajkova A.T.1, Bobylev V.V.1
- 
							Мекемелер: 
							- Main (Pulkovo) Astronomical Observatory
 
- Шығарылым: Том 61, № 9 (2017)
- Беттер: 727-738
- Бөлім: Article
- URL: https://journals.rcsi.science/1063-7729/article/view/190994
- DOI: https://doi.org/10.1134/S1063772917080017
- ID: 190994
Дәйексөз келтіру
Аннотация
High-accuracy absolute proper motions, radial velocities, and distances have now been measured for a number of dwarf-galaxy companions of the Milky Way, making it possible to study their 3D dynamics. Galactic orbits for 11 such galaxies (Fornax, Sagittarius, Ursa Minor, LMC, SMC, Sculptor, Sextans, Carina, Draco, Leo I, Leo II) have been derived using two previously refined models for the Galactic potential with the Navarro–Frenk–White and Allen–Santillán expressions for the potential of the dark-matter halo, and two different masses for the Galaxy within 200 kpc—0.75 × 1012M⊙ and 1.45 × 1012M⊙. The character of the orbits of most of these galaxies indicates that they are tightly gravitationally bound to the Milky Way, even with the lower-mass model for the gravitational potential. One exception is the most distant galaxy in the list, Leo I, whose orbit demonstrates that it is only weakly gravitationally bound, even using the higher-mass model of the gravitational potential.
Авторлар туралы
A. Bajkova
Main (Pulkovo) Astronomical Observatory
							Хат алмасуға жауапты Автор.
							Email: bajkova@gao.spb.ru
				                					                																			                												                	Ресей, 							St. Petersburg, 196140						
V. Bobylev
Main (Pulkovo) Astronomical Observatory
														Email: bajkova@gao.spb.ru
				                					                																			                												                	Ресей, 							St. Petersburg, 196140						
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