Optical Spectroscopy of LINERs and Low-Luminosity Seyfert Nuclei

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dc.creatorHo, Luis C.
dc.date1996-05-30
dc.date.accessioned2026-07-07T02:21:18Z
dc.date.available2026-07-07T02:21:18Z
dc.descriptionAn unprecedentedly large number of LINERs has been discovered in a recently completed optical spectroscopic survey of nearby galaxies, allowing several statistical properties of the host galaxies and of the line-emitting regions to be examined reliably for the first time. As a consequence of the many detections and some revised classifications, the detailed demographics of emission-line nuclei have been updated from those given in older surveys. Consistent with previous studies, it is found that LINERs are extremely common in the present epoch, comprising approximately 1/3 of all galaxies with B <= 12.5 mag. If all LINERs are nonstellar in origin, then they are the dominant constituents of the active galactic nucleus population. Many fundamental characteristics of LINERs closely resemble those of low-luminosity Seyfert nuclei, although several aspects of their narrow-line regions appear to differ in a systematic manner. These differences could hold important clues to the key parameters controlling the ionization level in active nuclei. Lastly, a substantial fraction of LINERs has been found to contain a broad-line region, yielding direct evidence, at least in these objects, of a physical link between LINERs and classical Seyfert 1 nuclei and QSOs.
dc.descriptionInvited review paper to appear in The Physics of LINERs in View of Recent Observations, ed. M. Eracleous, A. P. Koratkar, L. C. Ho, and C. Leitherer (San Francisco: ASP), in press. LaTex, 29 pages. ASP Conference Series macros included
dc.identifierhttps://arxiv.org/abs/astro-ph/9605190
dc.identifierhttp://arxiv.org/abs/astro-ph/9605190
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/10500
dc.subjectAstrophysics
dc.titleOptical Spectroscopy of LINERs and Low-Luminosity Seyfert Nuclei
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