133 citations · 1.2k across the 61 of their papers we have counts for
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Long-term variability of the optical spectra of NGC 4151: II. Evolution of the broad Ha and Hb emission-line profiles
A. I. Shapovalova, L. C. Popovic, A. N. Burenkov +5
Results of the long-term (11 years, from 1996 to 2006) H and H line variations of the active galactic nucleus of NGC 4151 are presented. High quality spectra (S/N>50 and R~8A…
Long term variability of the Broad Emission Line profiles in AGN
A. I. Shapovalova, L. C. Popovic, N. G. Bochkarev +6
Results of a long-term monitoring ( years) of the broad line and continuum fluxes of three Active Galactic Nuclei (AGN), 3C 390.3, NGC 4151, and NGC 5548, are presented…
The line parameters and ratios as the physical probe of the line emitting regions in AGN
D. Ilic, J. Kovacevic, L. C. Popovic
Here we discuss the physical conditions in the emission line regions (ELR) of active galactic nuclei (AGN), with the special emphasize on the unresolved problems, e.g. the stratifi…