Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..453l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 15, 1984, p. 453-457.
Astronomy and Astrophysics
Astrophysics
51
Centimeter Waves, H Lines, Hydrogen Clouds, Interstellar Gas, Radio Galaxies, Spiral Galaxies, Galactic Rotation, Galactic Structure, Kinematics, Mass Distribution, Missing Mass (Astrophysics), Radial Velocity, Spectral Line Width, Velocity Distribution
Scientific paper
A 21 cm survey of about 200 face-on galaxies using the 305 m Arecibo radio telescope is reported. The narrowest profiles for every morphological type are presented. The data are consistent with an integral velocity dispersion of about 8 km/s in every morphological type. When combined with the results of other studies, the present results indicate that the gas dispersion appears to be a universal number, broadly independent of morphological type, absolute magnitude, and position within a galaxy. Two direct consequences follow from the universality of an isotropic velocity distribution: (1) the 'missing mass' component within galaxies necessarily resides in the halo, and (2) small galaxies may only maintain an H I distribution through galaxy-wide random motions, provided that the appropriate dispersion is the canonical one.
No associations
LandOfFree
Face-on 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 Face-on galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Face-on galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1227031