期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 773, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/773/1/L4
关键词
galaxies: dwarf; galaxies: interactions; Galaxy: halo; Local Group
资金
- European Research Council under ERC-StG grant [GALACTICA-240271]
We propose a new model for the dark matter halo of the Milky Way that fits the properties of the stellar stream associated with the Sagittarius dwarf galaxy. Our dark halo is oblate with q(z) = 0.9 for r less than or similar to 10 kpc, and can be made to follow the Law & Majewski model at larger radii. However, we find that the dynamical perturbations induced by the Large Magellanic Cloud on the orbit of Sgr cannot be neglected when modeling its streams. When taken into account, this leads us to constrain the Galaxy's outer halo shape to have minor-to-major axis ratio (c/a)(Phi) = 0.8 and intermediate-to-major axis ratio (b/a)(Phi) = 0.9, in good agreement with cosmological expectations.
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