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LINERs exist in the nuclei of a large fraction of luminous galaxies, buttheir connection with the AGN phenomenon has remained elusive. We presentHubble Space Telescope narrowband [O III]5007 and H-alpha+[N II] emission-lineimages of the central regions of 14 galaxies with LINER nuclei. The compact, ~1arcsec-scale, unresolved emission that dominates the line flux in ground-basedobservations is mostly resolved by HST. The bulk of this emission comes fromregions with sizes of tens to hundreds of parsecs that are resolved into knots,filaments, and diffuse gas whose morphology differs from galaxy to galaxy. Mostof the galaxies do not show clear linear structures or ionization conesanalogous to those often seen in Seyfert galaxies. An exception is NGC 1052,the prototypical LINER, in which we find a 3 arcsec-long (~ 250 pc) biconicalstructure that is oriented on the sky along the galaxy's radio jet axis. Sevenof the galaxies have been shown in previously published HST images to have abright compact ultraviolet nuclear source, while the other seven do not have acentral UV source. Our images find evidence of dust in the nuclear regions ofall 14 galaxies, with clear indications of nuclear obscuration in most of the"UV-dark" cases. The data suggest that the line-emitting gas in most LINERs isphotoionized by a central source (which may be stellar, nonstellar, or acombination thereof) but that this source is often hidden from direct view. Wefind no obvious morphological differences between LINERs with detected weakbroad H-alpha wings in their spectra and those with only narrow lines.Likewise, there is no clear morphological distinction between objects whose UVspectra are dominated by hot stars (e.g., NGC 4569) and those that are AGN-like(e.g., NGC 4579).Comment: Accepted for publication in the ApJ. 25 pages, 3 tables, 9 JPEG  Figure

The Narrow‐Line Regions of LINERs as Resolved with theHubble Space Telescope