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An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. [1] Irregular galaxies do not fall into any of the regular classes of the Hubble sequence , and they are often chaotic in appearance, with neither a nuclear bulge nor any trace of spiral arm structure. [ 2 ]
UGC 8508 is a dwarf irregular galaxy located about 8.5 million light-years away from Earth in the constellation of Ursa Major. [1] It is sometimes classified as a member of the M101 Group of galaxies and has a diameter of around 4.2 kly (1.29 kpc). As an irregular galaxy, UGC 8508 does not exhibit any large scale organization in its structure.
NGC 4449, also known as Caldwell 21, is an irregular Magellanic type galaxy in the constellation Canes Venatici, being located about 13 million light-years away. [3] It is part of the M94 Group or Canes Venatici I Group that is relatively close to the Local Group hosting our Milky Way galaxy.
The galaxy has a huge envelope of hydrogen gas, with an apparent size measuring 68 ′ × 80 ′, which is far larger than the apparent size of the galaxy in visible light (5.5 ′ × 7.0 ′). IC 10 is also unusual in the respect that the visible part of the galaxy seems to rotate in a different direction than the outer envelope. [ 7 ]
NGC 1313 (also known as the Topsy Turvy Galaxy [2]) is a field galaxy [3] and an irregular galaxy [4] discovered by the Scottish astronomer James Dunlop on 27 September 1826. [5] It has a diameter of about 50,000 light-years , or about half the size of the Milky Way .
English: This Hubble Picture of the Week features NGC 2814, an irregular galaxy that lies about 85 million light years from Earth. In this image, which was captured using Hubble’s Advanced Camera for Surveys (ACS), the galaxy appears to be quite isolated: visually, it looks a little like a loose stroke of bright paint across a dark background.
NGC 6745 (also known as UGC 11391) is an irregular galaxy about 206 million light-years (63.5 mega-parsecs) away in the constellation Lyra. It was discovered by French astronomer Édouard Stephan on 24 July 1879. [4] NGC 6745 is actually a trio of galaxies in the process of colliding. The three galaxies have been colliding for hundreds of ...
NGC 2814 is a small spiral galaxy in the constellation Ursa Major. Its velocity relative to the cosmic microwave background is 1,693 ± 8 km/s, which corresponds to a Hubble distance of 24.97 ± 1.75 Mpc (~81.5 million light years.). [1] German-British astronomer William Herschel discovered this galaxy on 3 April 1791. NGC 2814 has a luminosity ...