Long term variability of the Broad Emission Line profiles in AGN

Details Long term variability of the Broad Emission Line profiles in AGN Long term variability of the Broad Emission Line profiles in AGN

2009-08-19

arxiv.org/abs/0908.2763v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

10 pages, 9 figures, New Astronomy Reviews (Proceeding of 7th SCSLSA), in press

Scientific paper

Results of a long-term monitoring ($\gtrsim 10$ years) of the broad line and continuum fluxes of three Active Galactic Nuclei (AGN), 3C 390.3, NGC 4151, and NGC 5548, are presented. We analyze the H$\alpha$ and H$\beta$ profile variations during the monitoring period and study different details (as bumps, absorption bands) which can indicate structural changes in the Broad Line Region (BLR). The BLR dimensions are estimated using the time lags between the continuum and the broad lines flux variations. We find that in the case of 3C 390.3 and NGC 5548 a disk geometry can explain both the broad line profiles and their flux variations, while the BLR of NGC 4151 seems more complex and is probably composed of two or three kinematically different regions.

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