Spatial motion of the Magellanic clouds: tidal models rulled out?

0322209 - ASÚ 2009 RIV US eng J - Journal Article
Růžička, Adam - Theis, Ch. - Palouš, Jan
Spatial motion of the Magellanic clouds: tidal models rulled out?
[Pohyb Magellanových oblaků v prostoru: jsou slapové modely vyloučeny?]
Astrophysical Journal. Roč. 691, č. 2 (2009), s. 1807-1815. ISSN 0004-637X. E-ISSN 1538-4357
R&D Projects: GA MŠMT(CZ) LC06014; GA AV ČR KJB300030801
Institutional research plan: CEZ:AV0Z10030501
Keywords : galaxies evolution * galaxies interaction * kinematics and dynamics * Magellanic Cculds * methods: N-body simulations
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 7.364, year: 2009

Recently, Kallivayalil et al. derived new values of the proper motion for the Large and Small Magellanic Clouds (LMC and SMC, respectively). The spatial velocities of both Clouds are unexpectedly higher than their previous values resulting from agreement between the available theoretical models of the Magellanic System and the observations of neutral hydrogen (H I) associated with the LMC and the SMC. We investigated this hypothesis for the pure tidal models, as they were the first ones devised to explain the evolution of the Magellanic System, and the tidal stripping is intrinsically involved in every model assuming the gravitational interaction.

Nové hodnoty vlastních pohybů Velkého a Malého Magellanova oblaku odvozené Kallivazalil et al. odhalují neočekávaně rychlý prostorový pohyb Magellanova systému. To může znamenat, že se oblaka přibližují k Mléčné dráze poprvé, což znemožňuje interpretaci tvaru a rychlostí HI v Magellanově proudu, mostu a ve vedoucím rameni pomocí modelů použivajících slapové síly.
Permanent Link: http://hdl.handle.net/11104/0170531