thick disk

thick disk

[¦thik ′disk]
(astronomy)
A component of the galactic stellar population that extends over distances up to 1500 parsecs from the galactic plane, and is approximately 9-10 × 109 years old, intermediate in age between the thin disk and the halo.
References in periodicals archive ?
Form into a thick disk, wrap in plastic wrap, and chill until firm, at least 2 hours.
Mowing lichen hand with slopes of ditches, crowns and embankment slopes; growth of thick disk.
The surface density, [alpha], density of thick disk, p, and stability of thick disks through of specific angular momentum or Rayleigh criterion (Rayleigh, 1917), and (Landau, 1987) were calculated.
For all solder applications, the small block of Pb-free solder powder and flux is formed into a thick disk.
A spectrometer on Spitzer revealed that a thick disk of warm, micrometer-size dust particles surrounds the star, which has a mass and age similar to that of the sun.
While shrinkage of a thin block is largely affected by fibril angle and permeability of the wood, shrinkage of a thick disk is done by the factors just mentioned and other factors such as growth stresses, drying temperature, drying stresses, collapse during drying, etc.
Such elongated shapes are common when a thick disk of gas and dust forms a dense "waist" around a dying star.
Each core had three or four 51-mm (2-in) thick disk sections available for the test.
More radiation would be emitted in a direction perpendicular to the thick disk, rather than along the disk, allowing material to fall in at higher rates," said co-author Niel Brandt, also of Penn State University.
According to an analysis by Gilmore and his collaborators, that ancient smackdown was the last major collision the Milky Way has endured, and the creation of the thick disk was the last significant change in the galaxy's structure.
The number of circumferentially oriented layers in the thick disk (Case 5) is greater than that in the thin disk (Case 1).