galactic disk Flattened region of gas and dust that bisects the galactic halo in a spiral galaxy. This is the region of active star formation.
Galactic Disk
The plate-shaped component of a spiral galaxy, in which the spiral arms are found.
Galactic Equator ...
Galactic Disk - A disk of matter, about 30 kiloparsecs (kpc) in diameter and 2 kiloparsecs thick, containing most of the stars and interstellar matter in the Milky Way ...
GALACTIC DISK GALACTIC HALO GALACTIC BULGE
Highly flattened
Roughly spherical"mildly flattened
Somewhat flattened and elongated in the plane of the disk ("football shaped") ...
Galactic Disk
A flattened disk of gas and young stars in a galaxy. Some galactic disks have material concentrated in spiral arms (as in a spiral galaxy) or bars (as in barred spirals).
Galactic Halo ...
The galactic disk contains not only stars but also gas and dust. In fact, new stars in the disk are born from this gas and dust. The gas and dust are opaque to light, blocking are view of most of the galactic disk.
The galactic disk has an estimated diameter of about 100,000 light-years (see 1 E20 m for a list of comparable distances). The distance from the Sun to the galactic center is estimated at between about 26,000 light-years and 35,000 light-years.
The galactic disk, which bulges outward at the galactic center, has a diameter of between 70,000 and 100,000 light-years.
The galactic disk is surrounded by a spheroid halo of old stars and globular clusters, of which 90% lie within 100,000 light-years,[28] suggesting a stellar halo diameter of 200,000 light-years.
The plane of galactic disk runs from upper left to lower right. The parallel filaments are perpendicular to galactic plane. The image is about 190 light years across.
It lies 27,000 light-years from the Galactic center, or about 40 percent of the way from the center to the edge of the Galactic disk. [C95]
(b) Central body of solar system. Spectral type G2 V. Mass 1.989 × 1033 g; luminosity 3.
The Star-Formation Law in Galactic Disks: Since stars come from gas, and we can now measure more or less directly the appropriate gas components, it is useful to ask how SFR depends on local gas properties.
A local deficit in the neutral material of the Galactic disk was identified using 21-cm observations.
Complementing the mechanisms which build up galactic disks are those which destroy them.
In the density wave model, the spiral arms represent regions in the galactic disk that are denser than average.
They are part of the Galactic disk, so it isn't too surprising that they might be found more abundantly there.
Hence, the fact that orbital speeds do not drop off outside the orbit of the sun indicates that there continues to be significant amounts of mass present, right out to the edge of the luminous galactic disk.
Tidal forces affecting the Oort cloud come from stars in the Milky Way's galactic disk with some pull from the galactic core. The tide results from the sun and comets being different distances from these massive amounts of matter.
Spiral arms probably form as the result of waves that sweep through the galactic disk. Like the waves on the ocean, these "density waves" don't carry material with them. Instead, they influence matter as they pass by.
Due to Kapteyn's proximity to Sol and its deduced ancient origin from outside the galactic disk, the star has been an object of high interest among astronomers.
In a spiral galaxy, it is the height above the galactic disk at which the density of a particular constituent of the disk has declined by e. This is different for different types of object (e.g.
Distinct from open clusters, their home is in a huge spheroidal halo that surrounds the Galactic disk.
The galactic disk has a diameter of about 100,000 light-years (see 1 E20 m for a list of comparable distances). The distance from the Sun to the galactic center is about 27,700 light-years.
Disk, galactic: The flattened, rotating portion of the Galaxy, centered on the galactic nucleus, containing much dust and gas as well as newly formed stars. Galactic disks are found in sprial galaxies and often exhibit prominent spiral arms.
The disk and the bulge are surrounded by the galactic halo, which is spherical and even larger than the galactic disk. The halo consists of old stars, some in the globular clusters, and interstellar matter.
A star whose velocity relative to the solar system is large. As a rule, high-velocity stars are Population II objects following orbital paths that are highly inclined to the plane of the galactic disk.
homeobox - (n.) ...
The hypothesis that there exists some extra undetected matter (like black dwarfs) in the disk of the Milky Way Galaxy also has been used. Then, the total mass distribution in the galactic disk may be large enough to induce tidal forces in the Oort ...
Although every star that you see with the unaided eye actually belongs to the Milky Way Galaxy, oftentimes the term "Milky Way" refers to the cross-sectional view of the galactic disk, ...
the sky to identify an excess of stars on the far side of the Milky Way, some 75,000 light-years from Earth. The Sagittarius dwarf is slowly dissolving, trailing streams of stars behind it as it orbits the Milky Way and sinks into the Galactic disk.
associated with the high latitude galactic infrared cirrus. The finding is significant because they may represent the birth places for the Population I metallicity B-type stars in the galactic halo which could have been borne in the galactic disk.
 See also: Disk, Light, Galaxy, Star, Solar
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