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Title:
Evidence for Coupling between the Sagittarius Dwarf Galaxy and the Milky Way Warp
Authors:
Bailin, Jeremy
Affiliation:
AA(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; )
Publication:
The Astrophysical Journal, Volume 583, Issue 2, pp. L79-L82. (ApJL Homepage)
Publication Date:
02/2003
Origin:
UCP
ApJ Keywords:
Galaxies: Individual: Name: Sagittarius dSph, Galaxies: Interactions, Galaxy: Disk, Galaxy: Halo, Galaxy: Kinematics and Dynamics
DOI:
10.1086/368160
Bibliographic Code:
2003ApJ...583L..79B

Abstract

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~270deg, b=0deg and have magnitude (2-8)×1012 Msolar 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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