English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present N-body simulations of a Sagittarius-like dwarf spheroidal galaxy(Sgr) that follow its orbit about the Milky Way (MW) since its first crossingof the Galaxy's virial radius to the present day. As Sgr orbits around the MW,it excites vertical oscillations, corrugating and flaring the Galactic stellardisc. These responses can be understood by a two-phase picture in which theinteraction is first dominated by torques from the wake excited by Sgr in theMW dark halo before transitioning to tides from Sgr's direct impact on the discat late times. We show for the first time that a massive Sgr modelsimultaneously reproduces the locations and motions of arc-like over densities,such as the Monoceros Ring and the Triangulum Andromeda stellar clouds, thathave been observed at the extremities of the disc, while also satisfying thesolar neighbourhood constraints on the vertical structure and streaming motionsof the disc. In additional simulations, we include the Large Magellanic Cloud(LMC) self consistently with Sgr. The LMC introduces coupling throughconstructive and destructive interference, but no new corrugations. In ourmodels, the excitation of the current structure of the outer disk can be tracedto interactions as far back as 6-7 Gyr ago (corresponding to $z\leq1$). Giventhe apparently quiescent accretion history of the MW over this timescale, thisplaces Sgr as the main culprit behind the vertical oscillations of the disc andthe last major accretion event for the Galaxy with the capacity to modulate itschemodynamical structure.

The Influence of Sagittarius and the Large Magellanic Cloud on the Milky Way Galaxy