Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pgh..conf....3k&link_type=abstract
The Physics of Galactic Halos, Proceedings of the 156th WE-Heraeus Seminar, Bad Honnef, Germany, February 11-14, 1996, Eds.: Les
Astronomy and Astrophysics
Astronomy
1
Radio Astronomy, Radio Emission, Radio Observation, Radio Spectra, Radio Telescopes, Galactic Halos, Galactic Structure, Hydrogen Atoms, Neutral Gases, Dispersion, Radial Velocity, Velocity Distribution, Spectral Emission, Emission Spectra, H Lines, Line Spectra, Spectral Line Width, Hydrogen Clouds
Scientific paper
The Leiden/Dwingeloo Survey (LDS), which becomes available soon, offers new possibilities for analyzing Galactic HI with an outstanding sensitivity. The survey data have been carefully corrected for sidelobe contamination of the antenna and for baseline effects in the velocity range $-450$~\kms~$< Vlsr < +400$~\kms. At present this survey is the most reliable database for analysis of faint, large-scale \hi features which may be attributed to an HI halo of the Galaxy. This motivated investigations which are briefly described in this paper. We find evidence for weak HI emission connecting high-velocity clouds (HVC) with gas at intermediate velocities (IV) or low velocities (LV). These weak emission features, which we call 'velocity bridges', are very common at least in HVC complex C. It is difficult to interpret such a wide-spread phenomenon in the context of the current theory placing the HVCs at distances of several kpc above the Galactic plane. HI gas with large velocity dispersions is another phenomenon which can be analyzed using the LDS. We detect \hi gas with properties similar to those of the Lockman layer, although some of the parameters are more extreme. In every direction of the sky \hi gas was found having a characteristic dispersion of 70 \kms and column densities in the range $1 - 2\times 1019$~cm$^{-2}$.
Burton William Butler
Hartmann Dap
Kalberla Peter M. W.
Mebold Ulrich
Pietz Jochen
No associations
LandOfFree
HI Gas in the Galactic Halo does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with HI Gas in the Galactic Halo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HI Gas in the Galactic Halo will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1607338