Other
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..783..310d&link_type=abstract
THE EVOLUTION OF STARBURSTS: The 331st Wilhelm and Else Heraeus Seminar. AIP Conference Proceedings, Volume 783, pp. 310-318 (2
Other
1
Star Formation, Galaxies, Interstellar Matter, H Ii Regions, Spiral Galaxies, Galactic Halos, Spiral Arms And Bars, Galactic Disks, Intercloud Medium, Hot And Highly Ionized Gas, Bubbles, Hi Regions And 21-Cm Lines, Diffuse, Translucent, And High-Velocity Clouds
Scientific paper
The evidence for starformation in the disks of spiral galaxies driving the disk-halo interaction is briefly reviewed. It is argued that diffuse ionized gas (DIG) in the halos of edge-on disk galaxies traces the presence of extraplanar gas well since it correlates with the star formation rate in the underlying disk as well as with other gaseous phases and components of the ISM such as X-ray hot gas, cosmic rays, and magnetic fields. The dependence on the starformation rate is demonstrated using a survey of H+ halos with more than 70 objects. This survey allows us to establish a minimum energy release per unit area that is required to start the disk-halo mass exchange. Observations of extraplanar HII regions let us conclude that also molecular hydrogen must be present. In addition, well ordered magnetic field in the gaseous halos can be deduced from the polarization of synchrotron radiocontinuum maps.
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