3D MHD Modeling of the Gaseous Structure of the Galaxy: Synthetic Observations

Abstract

We generated synthetic observations from the four-arm model presented in Gomez & Cox (2004) for the Galactic ISM in the presence of a spiral gravitational perturbation. We found that velocity crowding and diffusion have a strong effect in the l-v diagram. The v-b diagram presents structures at the expected spiral arm velocities, that can be explained by the off-the-plane structure of the arms presented in previous papers of this series. Such structures are observed in the Leiden/Dwingeloo HI survey. The rotation curve, as measured from the inside of the modeled galaxy, shows similarities with the observed one for the Milky Way Galaxy, although it has large deviations from the smooth circular rotation corresponding to the background potential. The magnetic field inferred from a synthetic synchrotron map shows a largely circular structure, but with interesting deviations in the midplane due to distortion of the field from circularity in the interarm regions.

Accepted for publication in ApJ. Better quality figures in http://www.astro.umd.edu/~gomez/publica/3d_galaxy-3.pdf

References in corpus (4)

• The Wisconsin H-Alpha Mapper Northern Sky Survey
• 3D MHD Modeling of the Gaseous Structure of the Galaxy: Setup and Initial Results
• Extraplanar Emission-Line Gas in Edge-On Spiral Galaxies. II. Optical Spectroscopy
• 3D MHD Modeling of the Gaseous Structure of the Galaxy: Description of the Simulations

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• Errors in kinematic distances and our image of the Milky Way Galaxy
• 3D MHD Modeling of the Gaseous Structure of the Galaxy: Description of the Simulations
• FOREST Unbiased Galactic Plane Imaging Survey with the Nobeyama 45-m Telescope (FUGIN) IV: Galactic Shock Wave and Molecular Bow Shock in the 4-kpc Arm of the Galaxy
• Corrugated velocity patterns in the spiral galaxies: NGC 278, NGC 1058, NGC 2500 \& UGC 3574
• Synthetic HI observations of a simulated spiral galaxy
• Herschel HIFI Observations of the Sgr A +50 km/s Cloud. Deep Searches for O2 in Emission and Foreground Absorption
• Giant Cometary HII Regions and Molecular Bow Shocks in Spiral Arms of Galaxies: M83
• Using synthetic emission maps to constrain the structure of the Milky Way