Search results
Results From The WOW.Com Content Network
Bar-shaped elongations of stars are observed in roughly two-thirds of all spiral galaxies. [ 10 ] [ 11 ] Their presence may be either strong or weak. In edge-on spiral (and lenticular) galaxies, the presence of the bar can sometimes be discerned by the out-of-plane X-shaped or (peanut shell)-shaped structures [ 12 ] [ 13 ] which typically have ...
In spiral galaxies, the spiral arms do have the shape of approximate logarithmic spirals, a pattern that can be theoretically shown to result from a disturbance in a uniformly rotating mass of stars. Like the stars, the spiral arms rotate around the center, but they do so with constant angular velocity .
Spiral galaxies range from S0, the lenticular galaxies, to Sb, which have a bar across the nucleus, to Sc galaxies which have strong spiral arms. In total count, ellipticals amount to 13%, S0 to 22%, Sa, b, c galaxies to 61%, irregulars to 3.5%, and peculiars to 0.9%. At the center of most galaxies is a high concentration of older stars.
1 Spiral galaxies. 2 See also. ... Lists of astronomical objects; List of galaxies; Spiral galaxy; References This page was last edited on 10 December 2024, at 20:21 ...
2 galaxies Two spiral galaxies currently starting a collision, tidally interacting, and in the process of merger. [citation needed] Eyes Galaxies (NGC 4435 & NGC 4438, Arp 120) 2 galaxies Two galaxies which have interacted or still interacting via an off-center collision, both had interacted with M86 in the past. [citation needed]
NGC 1300, viewed nearly face-on; Hubble Space Telescope image. A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. [1] Bars are found in about two thirds of all spiral galaxies in the local universe, [2] and generally affect both the motions of stars and interstellar gas within spiral galaxies and can affect spiral arms as well.
Both the Milky Way and one of our nearest galaxy neighbors, the Andromeda Galaxy, are spiral galaxies. [67]: 875 Irregular galaxies are chaotic in appearance, and are neither spiral nor elliptical. [67]: 879 About a quarter of all galaxies are irregular, and the peculiar shapes of such galaxies may be the result of gravitational interaction.
This implies that spiral galaxies contain large amounts of dark matter or, alternatively, the existence of exotic physics in action on galactic scales. The additional invisible component becomes progressively more conspicuous in each galaxy at outer radii and among galaxies in the less luminous ones.