منابع مشابه
Milky Way Mass Models and MOND
Using the Tuorla-Heidelberg model for the mass distribution of the Milky Way, I determine the rotation curve predicted by MOND. The result is in good agreement with the observed terminal velocities interior to the solar radius and with estimates of the Galaxy’s rotation curve exterior thereto. There are no fit parameters: given the mass distribution, MOND provides a good match to the rotation c...
متن کاملMass models of the Milky Way
A parameterized model of the mass distribution within the Milky Way is fitted to the available observational constraints. Constraints at R < R0 and at R ≃ R0 are well satisfied, while those at 1 < R/R0 <∼ 2 cannot be adequately fitted with the consequence that the circular speed vc(R) at R > R0 is extremely uncertain. The most important single parameter is the ratio of the scale length Rd,∗ of ...
متن کاملMilky Way potentials in CDM and MOND. Is the Large Magellanic Cloud on a bound orbit?
We compute the Milky Way potential in different cold dark matter (CDM) based models, and compare these with the modified Newtonian dynamics (MOND) framework. We calculate the axis ratio of the potential in various models, and find that isopotentials are less spherical in MOND than in CDM potentials. As an application of these models, we predict the escape velocity as a function of the position ...
متن کاملDynamical Models of the Milky Way
The only way to map the Galaxy's gravitational potential Φ(x) and the distribution of matter that produces it is by modelling the dynamics of stars and gas. Observations of the kinematics of gas provide key information about gradients of Φ within the plane, but little information about the structure of Φ out of the plane. Traditional Galaxy models assume, for each of the Galaxy's components, ar...
متن کاملMilky Way
7 Globular clusters and Population II stars are fossil remnants of the first major epoch of star formation in the Milky Way. SIM Lite will determine precise distances to selected Pop II objects to define a reliable distance scale, and establish reliable absolute and relative ages. Those ages set a minimum age for the Universe and map the early formation history of the Milky Way. The resultant a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2008
ISSN: 0004-637X,1538-4357
DOI: 10.1086/589148