Steps toward Determination of the Size and Structure of the Broad‐Line Region in Active Galactic Nuclei. XVI. A 13 Year Study of Spectral Variability in NGC 5548
- Peterson, B. M.
- Berlind, Perry
- Bertram, R.
- Bischoff, K.
- Bochkarev, N. G.
- Borisov, N.
- Burenkov, A. N.
- Calkins, Michael Lee
- Carrasco, L.
- Chavushyan, V. H.
- Chornock, R
- Dietrich, M.
- Doroshenko, V. T.
- Ezhkova, O. V.
- Filippenko, A. V.
- Gilbert, A. M.
- Huchra, J. P.
- Kollatschny, W.
- Leonard, D. C.
- Li, W.
- Lyuty, V. M.
- Malkov, Yu. F.
- Matheson, T.
- Merkulova, N. I.
- Mikhailov, V. P.
- Modjaz, M.
- Onken, C. A.
- Pogge, R. W.
- Pronik, V. I.
- Qian, B.
- Romano, P.
- Sergeev, S. G.
- Sergeeva, E. A.
- Shapovalova, A. I.
- Spiridonova, O. I.
- Tao, J.
- Tokarz, S.
- Valdes, J. R.
- Vlasiuk, V. V.
- Wagner, R. M.
- Wilkes, Belinda Jane
DOIAbstract
We present the final installment of an intensive 13 year study of variations of the optical continuum and broad Hβ emission line in the Seyfert 1 galaxy NGC 5548. The database consists of 1530 optical continuum measurements and 1248 Hβ measurements. The Hβ variations follow the continuum variations closely, with a typical time delay of about 20 days. However, a year-by-year analysis shows that the magnitude of emission-line time delay is correlated with the mean continuum flux. We argue that the data are consistent with the simple model prediction between the size of the broad-line region and the ionizing luminosity, r ∝ Lion. Moreover, the apparently linear nature of the correlation between the Hβ response time and the nonstellar optical c...
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