LAMP: reverberation mapping of H and He lines

We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3m Shane telescope with the aim of measuring the masses of the black holes in 12 nearby (z<0.05) Seyfert 1 galaxies with expected masses in the range ~10^6^-10^7^M_{sun}_ and also the well-studied nearby active galactic nucleus (AGN) NGC 5548. Nine of the objects in the sample (including NGC 5548) showed optical variability of sufficient strength during the monitoring campaign to allow for a time lag to be measured between the continuum fluctuations and the response to these fluctuations in the broad H{beta} emission, which we have previously reported.

We present here the light curves for the H{alpha}, H{gamma}, HeII{lambda}4686, and HeI{lambda}5876 emission lines and the time lags for the emission-line responses relative to changes in the continuum flux.