Long-term profile variability of double-peaked emission lines in AGNs

K. T. Lewis, M. Eracleous, J. P. Halpern, T. Storchi-Bergmann
2004 Proceedings of the International Astronomical Union  
An increasing number of AGNs exhibit broad, double-peaked Balmer emission lines, which arise from the outer regions of the accretion disk which fuels the AGN. The line profiles vary on timescales of 5--10 years. Our group has monitored a set of 20 double-peaked emitters for the past 8 years (longer for some objects). Here we describe a project to characterize the variability patterns of the double-peaked H alpha line profiles and compare with those of two simple models: a circular disk with a
more » ... cular disk with a spiral arm and an elliptical disk.
doi:10.1017/s1743921304001668 fatcat:2v5yhwhmaregjphwd3ns3dllhq