Low surface brightness galaxy

Source: Wikipedia, the free encyclopedia.
An image of NGC 45, a low surface brightness spiral galaxy, by GALEX.
UGC 477 is located over 110 million light-years away in the constellation of Pisces.[1]

A low-surface-brightness galaxy, or LSB galaxy, is a diffuse galaxy with a surface brightness that, when viewed from Earth, is at least one magnitude lower than the ambient night sky.

Most LSBs are dwarf galaxies, and most of their baryonic matter is in the form of neutral gaseous hydrogen, rather than stars. They appear to have over 95% of their mass as non-baryonic dark matter. There appears to be little supernova (SN) activity in these galaxies,[citation needed] although LSB galaxy IC 217 hosted 2014cl.[2][3]

bulges of normal spiral galaxies. Therefore, they seem to be dark-matter
-dominated even in their centers, which makes them excellent laboratories for the study of dark matter.

In comparison to the high-surface-brightness galaxies, LSBs are mainly isolated

field galaxies
, found in regions devoid of other galaxies. In their past, they had fewer tidal interactions or mergers with other galaxies, which could have triggered enhanced star formation. This is an explanation for the small stellar content.

LSB galaxies were theorized to exist in 1976 by Mike Disney.

Giant low-surface-brightness galaxies

Giant low surface brightness (GLSB) galaxies are among the most massive known

active galactic nuclei.[4] GLSB galaxies are usually isolated systems that rarely interact with other galaxies.[4] The first LSB galaxy verified to exist was Malin 1, discovered in 1986. As such, it was also the first giant LSB galaxy identified. At the time of its discovery, it was the largest spiral galaxy known (by scale-length measurement).[5][6]

UGC 1382 was previously thought to be an elliptical galaxy, but low-brightness spiral arms were later detected. UGC 1382 is much closer to Earth than Malin 1.[7]

Examples

See also

References

  1. ^ "Hiding in the night sky". Retrieved 4 April 2016.
  2. doi:10.1051/0004-6361:20030585
    .
  3. Bibcode:2014CBET.3950....1G
    .
  4. ^
    S2CID 118546432
    .
  5. ^
    Bibcode:1997SciAm.276b..40B
  6. ^ Ken Crosswell, "Malin 1: A Bizarre Galaxy Gets Slightly Less So", 22 January 2007
  7. ^ "Surprise: Small elliptical galaxy actually a giant disk". 11 July 2016. Retrieved 12 July 2016.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Low_surface_brightness_galaxy&oldid=1199250378"