Disk Component
All material confined to the plane of the galaxy.
Distance Indicator ...
Besides bulge and disk components, intermediate structures (such as the visual lens) may appear. These are shown in the K-band profile of VV188=NGC 4438 (which is much messier optically than in the near-infrared).
Spiral galaxies, or type S, have a disk component and a bulge. All spirals have these two components; otherwise spirals have considerable variation. S0 type galaxies appear sort of intermediate between ellipticals and other spirals.
Most of the H I gas is in disk component of our galaxy and is located within 720 light years from the midplane of the disk. What's very nice is that 21-cm line radiation is not blocked by dust! ...
Galaxies may be conveniently parameterized by their bulge-to-disk (B/D) ratio, where the bulge component is a spheroidal distribution of stars with isotropic orbits and the disk component is a highly flattened distribution of stars and gas with ...
A galaxy with an obvious disk component containing gas; dust hot, bright stars; and spiral arms.
stellar parallax
A measure of stellar distance (see parallax).
spiral galaxy Galaxy composed of a flattened, star-forming disk component which may have spiral arms and a large central galactic bulge.
 See also: Disk, Light, Galaxy, Emission, Distance
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