Low-ionization nuclear emission-line region

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Example of a LINER galaxy : the Sombrero Galaxy  (M104), observed by the Hubble Space Telescope  (HST). Credit: HST / NASA / ESA .

A low-ionization nuclear emission-line region (LINER; in German about galaxy core regions with emission lines with a low degree of ionization ) is a type of galaxy core that is defined by its spectral lines :

  • the spectra typically show emission lines from neutral or weakly ionized atoms, such as O , O + , N + and S + ;
  • conversely, the emission lines for strongly ionized atoms such as O ++ , Ne ++ and He + are relatively small.

This class of galaxy nuclei was first described by Timothy Heckman in the third paper in a series published in 1980 on the spectra of galaxy nuclei.

Notable LINER galaxies

See also

  • Seyfert Galaxy - Another class of galaxies that contain an AGN.

Individual evidence

  1. ↑ a b c d e L. C. Ho, AV Filippenko, WLW Sargent: A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies . In: Astrophysical Journal Supplement . tape 112 , no. 2 , 1997, p. 315–390 , doi : 10.1086 / 313041 , arxiv : astro-ph / 9704107 , bibcode : 1997ApJS..112..315H .
  2. ↑ a b T. M. Heckman: An optical and radio survey of the nuclei of bright galaxies - Activity in normal galactic nuclei . In: Astronomy and Astrophysics . tape 87 , 1980, pp. 152-164 , bibcode : 1980A & A .... 87..152H .