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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 ]
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 3448 is an irregular galaxy in the constellation Ursa Major.The galaxy lies about 75 million light years away from Earth, which means, given its apparent dimensions, that NGC 3448 is approximately 125,000 light years across. [1]
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.
LEDA/PGC 16389 is a Hubble-type dwarf irregular galaxy (dIrr) in the constellation Caelum in the southern sky. It is estimated to be 22 million light-years from the Milky Way and forms an optical galaxy pair with APMBGC 252+125-117.
The distance to the galaxy was previously believed to be only 2.4 Mpc (7.8 Mly). [4] However, in 2008 scientists studying images from Hubble calculated the galaxy's distance at nearly 11 million light-years away, about 4 million light-years farther than previously thought, meaning it is a member of the IC 342 group of galaxies. [2] [5]
NGC 4485 is an irregular galaxy located in the northern constellation of Canes Venatici.It was discovered January 14, 1788 by William Herschel. [6] This galaxy is located at a distance of 29 [4] million light years and is receding with a heliocentric radial velocity of 483 km/s.