Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004assl..312..167t&link_type=abstract
High Velocity Clouds. Edited by Hugo van Woerden, Kapteyn Institute, Groningen, The Netherlands; Bart P. Wakker, University of W
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
The study of emission lines from HVCs is yielding new information on their basic properties as well as on the properties of their environment. Such studies are also providing new insights into the location, origin, and role in the Galaxy of the HVCs. Very sensitive velocity-resolved measurements of Hα now exist for many HVCs, including the Magellanic Stream, complexes A and C, and some compact HVCs. These data show that ionized hydrogen is strongly associated with the neutral hydrogen, but also that the H i brightness temperature and Hα intensity are not correlated. The detection of Hα emission from many compact HVCs provides an argument against the idea that they are massive clouds distributed through-out the Local Group of galaxies - intergalactic clouds would not be suciently ionized to produce the observed intensities. Combined with direct distance measurements for many HVCs, the Hα data can provide measurements of the intensity of the radiation field in the environs of the Milky Way, and of the escape fraction of ionizing photons.
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