Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-03-06
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS, 13 pages, 7 figures, 3 tables
Scientific paper
10.1111/j.1365-2966.2008.13198.x
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 in the Galaxy. This could be useful in comparing with future data from planned or already-underway kinematic surveys (RAVE, SDSS, SEGUE, SIM, GAIA or the hypervelocity stars survey). In addition, the predicted escape velocity is compared with the recently measured high proper motion velocity of the Large Magellanic Cloud (LMC). To bind the LMC to the Galaxy in a MOND model, while still being compatible with the RAVE-measured local escape speed at the Sun's position, we show that an external field modulus of less than $0.03 a_0$ is needed.
Famaey Benoit
Gentile Gianfranco
Perets Hagai
Wu Xufen
Zhao HongSheng
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