期刊
ASTROPHYSICAL JOURNAL
卷 583, 期 2, 页码 L79-L82出版社
UNIV CHICAGO PRESS
DOI: 10.1086/368160
关键词
galaxies : individual (Sagittarius dSph); galaxies : interactions; Galaxy : disk; Galaxy : halo; Galaxy : kinematics and dynamics
Using recent determinations of the mass and orbit of Sagittarius, I calculate its orbital angular momentum. From the latest observational data, I also calculate the angular momentum of the Milky Way's warp. I find that both angular momenta are directed toward l approximate to 270degrees, b = 0degrees and have magnitude (2-8) x 10(12) M. kpc kpc km s(-1), where the range in both cases reflects uncertainty in the mass. The coincidence of the angular momenta is suggestive of a coupling between these systems. Direct gravitational torque of Sgr on the disk is ruled out as the coupling mechanism. Gravitational torque due to a wake in the halo and the impulsive deposition of momentum by a passage of Sgr through the disk are still both viable mechanisms pending better simulations to test their predictions on the observed Sagittarius-Milky Way system.
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