Stochastic Star Formation, Magnetic Fields and the Fine Structure of Spiral Arms
Spiral arms are not smooth features. The assumption of regularity of spiral arm structures is much more introduced by theoretical concepts and the need for simplification than by observational facts. Star forming activity disturbs and changes any regular spatial structure and the radial and vertical velocity fields. The intermediate scale dynamics (1–2 kpc) organizes locally well defined deviations in velocity space and in the spatial locations of star forming sites. These deviations, i.e. the fine structure of spiral arms, are the result of the interaction of stellar dynamical forces, star forming activity and magnetic fields. The interstellar medium is reshuffeled and stirred by these influences. Here we present some building blocks on the route towards a unifying picture concerning the z-structure of spiral arms and magnetic field configurations.
KeywordsMolecular Cloud Rotation Curve Galactic Plane Magnetic Field Configuration Dark Cloud
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