J. C. Shields, H. -W. Rix, D. H. McIntosh, L. C. Ho, G. Rudnick, A. V. Filippenko, W. L. W. Sargent, M. Sarzi, M. Eracleous
Published 2000-09-19Version 1
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.
Comments: 7 pages, 2 figures. To appear in "Probing the Physics of Active Galactic Nuclei by Multiwavelength Monitoring"
Of Variability, or its Absence, in HgMn Stars
A search for variability in brown dwarfs and L dwarfs
The spectrum of Sgr A* and its variability
