Astrophysics (Index)About


(low-ionization nuclear emission-line region)
(galaxy nucleus emitting spectral lines for ionized and neutral atoms)

A LINER (for low-ionization nuclear emission-line region) refers to a galaxy nucleus with certain emission lines, and such a galaxy is called a LINER galaxy. Emission lines include neutral oxygen, singly-ionized oxygen, nitrogen, and sodium, but no more than weak lines of singly-ionized helium or doubly ionized oxygen or nitrogen.

LINER galaxies are common and often other than grand design spiral galaxies. More than one theory exists to explain the underlying cause:

(galaxies,galaxy nucleus,ionization)
Further reading: nuclear emission-line region