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ESA Data Ontology

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Galactic and extragalactic astronomy > Galaxies > Low surface brightness galaxies

Preferred term

Low surface brightness galaxies  

Definition

  • A member of a particularly faint population of galaxies with a central surface brightness below the brightness of the background sky. The central regions of many of them resemble a dwarf galaxy, but most of the mass is contained in a large gaseous disk of low density that is observable only with long-exposure optical images or at radio wavelengths. Some are as massive as a large spiral galaxy, for example Malin 1. The proportion of LSBGs relative to normal galaxies is unknown. They may however represent a significant fraction of mass in the Universe. LSBGs are thought to be primitive systems because they have total masses similar to normal galaxies, but have typically converted less than 10% of their gas into stars. Spiral LSBGs do not obey Freeman's law. (en)

Broader concept

Narrower concepts

Entry terms

  • LSBG (en)
  • UDG (en)
  • Ultra diffuse galaxies (en)
  • Ultra-diffuse galaxies (en)
  • Ultradiffuse galaxies (en)
  • Ultra diffuse galaxy (en)
  • Ultra-diffuse galaxy (en)
  • Ultradiffuse galaxy (en)

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URI

http://astrothesaurus.org/uat/940

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RDF/XML TURTLE JSON-LD Created 11/1/16, last modified 11/9/20