Other
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atnf.prop.3584p&link_type=abstract
ATNF proposal C2422, Semester: October, 2010
Other
Interstellar Medium Of Other Galaxies, Spectroscopy And Imaging Of Nearby Galaxies, Atca
Scientific paper
One of the key assumptions in dynamical applications of the HI velocity dispersion in disk galaxies (e.g. to the flattening of the dark halo) has always been the isothermal nature of the HI distribution. There is no physical reason for this assumption: it is made because until now it has not been possible to measure how the HI velocity dispersion changes with height above the galactic plane. If the velocity dispersion is not isothermal, then the inferred HI pressure gradient is incorrect and the dynamical conclusions will be in error. We have recently published a new technique for measuring the radial and vertical variation of the HI velocity dispersion in edge-on disk galaxies. By carefully observing the HI velocity dispersion in edge-on galaxies ESO 138-G014 and ESO 274-G001 as a function of radius and height above the plane, we will be able for the first time to use the hydrostatics of the HI layer near the plane to probe the shape of the halo and the contribution of the stellar component to the rotation curve.
Freeman Ken
Peters Stephan Pieter Cornelis
van der Kruit Pieter Corijnus
No associations
LandOfFree
The Vertical Variation of HI Velocity Dispersion in Disk Galaxies 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 The Vertical Variation of HI Velocity Dispersion in Disk Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Vertical Variation of HI Velocity Dispersion in Disk Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1120214