The Warp and Spiral Arms of the Milky Way

Simple item page
dc.creatorLevine, E. S.
dc.creatorBlitz, Leo
dc.creatorHeiles, Carl
dc.creatorWeinberg, Martin
dc.date2006-09-19
dc.date.accessioned2026-07-07T07:23:17Z
dc.date.available2026-07-07T07:23:17Z
dc.descriptionWe examine the outer Galactic HI disk for deviations from the b=0 plane by constructing maps of disk surface density, mean height, and thickness. We find that the Galactic warp is well described by a vertical offset plus two Fourier modes of frequency 1 and 2, all of which grow with Galactocentric radius. A perturbation theory calculation demonstrates that the tidal influence of the Magellanic Clouds creates distortions in the dark matter halo, which combine to produce disk warp amplitudes comparable to the observations. We also construct a detailed map of the perturbed surface density of HI in the outer disk demonstrating that the Galaxy is a non-axisymmetric multi-armed spiral. Overdensities in the surface density are coincident with regions of reduced gas thickness.
dc.descriptionConference proceedings for "Mapping the Galaxy and Nearby Galaxies," Ishigaki Japan, June 2006. 6 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0609554
dc.identifierhttp://arxiv.org/abs/astro-ph/0609554
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/115927
dc.subjectAstrophysics
dc.titleThe Warp and Spiral Arms of the Milky Way
dc.typetext

Files

Collections

arXiv