Publications of the Astronomical Society of Australia | |
The Effect of Drag from the Galactic Hot Halo on the Magellanic Stream and Leading Arm | |
Jonathan Diaz1  | |
[1] Kenji Bekki | |
关键词: Magellanic Clouds; Galaxy: halo; galaxies: kinematics and dynamics; galaxies: evolution; | |
DOI : 10.1071/AS10044 | |
学科分类:天文学(综合) | |
来源: CSIRO | |
【 摘 要 】
We study the effect of drag induced by the Galactic hot halo on the two neutral hydrogen (HI) cloud complexes associated with the Large and Small Magellanic Clouds: the Magellanic Stream (MS) and the Leading Arm (LA). In particular, we adopt the numerical models of previous studies and re-simulate the tidal formation of the MS and LA with the inclusion of a drag term. We find that the drag has three effects which, although model-dependent, may bring the tidal formation scenario into better agreement with observations: correcting the LA kinematics, reproducing the MS column density gradient, and enhancing the formation of MS bifurcation. We furthermore propose a two-stage mechanism by which the bifurcation forms. In general, the inclusion of drag has a variety of both positive and negative effects on the global properties of the MS and LA, including their on-sky positions, kinematics, radial distances, and column densities. We also provide an argument which suggests that ram-pressure stripping and tidal stripping are mutually exclusive candidates for the formation of the MS and LA.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912040532069ZK.pdf | 4455KB | download |