High-velocity clouds

http://astrothesaurus.org/uat/735

alt label
HVC
High velocity clouds
dcterms modified equal to or less than 2020-11-02T16:39:58.316Zequal to or more than 2020-11-02T16:39:58.316Z
broader
http://astrothesaurus.org/uat/834 original
narrower
735 original
definition A population of neutral or partly ionized gas clouds in the Galactic halo which are seen as high-altitude structures in the atomic hydrogen 21 cm emission at high radial velocities (v_LSR > 100 km/sec). They have substantial neutral column densities (> 10^19 cm^-2) and their metallicities range from 0.1 to about 1.0 times solar. The distances to the majority of them remain unknown. They may represent the continuing infall of matter onto the Local Group.
narrower
http://astrothesaurus.org/uat/991 original
broader
735 original
type
Resource original
Concept original
contributor AAS_Frey.Katie_Admin original