Low-ionization nuclear emission-line region

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A low-ionization nuclear emission-line region (LINER) is a type of galactic nucleus that is defined by its spectral line emission. The spectra typically include line emission from weakly ionized or neutral atoms, such as O, O+, N+, and S+.

Excerpt from the Wikipedia article “Low-ionization nuclear emission-line region”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA/ESA and The Hubble Heritage Team (STScI/AURA), Public domain, via Wikimedia Commons.