Variability in LINERs

Authors :: Shields, J. C.
Rix, H. -W.
McIntosh, D. H.
Ho, L. C.
Rudnick, G.
Filippenko, A. V.
Sargent, W. L. W.
Sarzi, M.
Eracleous, M.
Publication Year :: 2000
Publisher :: arXiv, 2000.
Abstract: A small number of LINERs have been seen to display variable H-alpha emission with a very broad, double-peaked profile. Recent observations with the Hubble Space Telescope indicate that such emission may be a common attribute of LINERs. The double-peaked or double-shouldered line profiles resemble those found in a subset of broad-line radio galaxies. Several lines of argument suggest that such features trace an outer thin accretion disk irradiated by an inner ion torus, in accord with advection-dominated accretion flow (ADAF) models. Variability monitoring of this broad H-alpha component thus may provide a means of testing accretion physics on small scales within these sources.<br />Comment: 7 pages, 2 figures. To appear in "Probing the Physics of Active Galactic Nuclei by Multiwavelength Monitoring"