publication . Preprint . Article . 2015

Radial distributions of arm-gas offsets as an observational test of spiral theories

Junichi Baba; Kana Morokuma-Matsui; Fumi Egusa;
Open Access English
  • Published: 12 May 2015
Abstract
Theories of stellar spiral arms in disk galaxies can be grouped into two classes based on the longevity of a spiral arm. Although the quasi-stationary density wave theory supposes that spirals are rigidly-rotating, long-lived patterns, the dynamic spiral theory predicts that spirals are differentially-rotating, transient, recurrent patterns. In order to distinguish between the two spiral models from observations, we performed hydrodynamic simulations with steady and dynamic spiral models. Hydrodynamics simulations in steady spiral models demonstrated that the dust lane locations relative to the stellar spiral arms (hereafter, arm-gas offsets) depend on radius, r...
Subjects
arXiv: Astrophysics::Galaxy AstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics
free text keywords: Astrophysics - Astrophysics of Galaxies, Spiral galaxy, Pitch angle, Spiral, Galaxy, Grand design spiral galaxy, Density wave theory, Physics, Astrophysics, Interacting galaxy, Irregular galaxy
Related Organizations
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publication . Preprint . Article . 2015

Radial distributions of arm-gas offsets as an observational test of spiral theories

Junichi Baba; Kana Morokuma-Matsui; Fumi Egusa;