LINER (acronym for low-ionization nuclear emission-line region) Common type of galactic nucleus defined by the ratios of (usually weak) emission lines. Some LINERs are clearly low-power active galactic nuclei, judged by the presence of weak broad lines similar to those in type 1 seyfert galaxies or associated radiation in the ultraviolet, radio or X-ray regions. Other LINERs are connected to starburst galaxies, either by having gas excited by shocks in the winds blown from starbursts or photo-ionized by unusually hot stars as the starburst progresses. At low levels, most luminous galaxies have a LINER nucleus.
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