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25 April 2024

» arxiv » 1503.1146

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The Lick AGN Monitoring Project 2011: Spectroscopic Campaign and Emission-Line Light Curves
A. J. Barth ; V. N. Bennert ; G. Canalizo ; A. V. Filippenko ; E. L. Gates ; J. E. Greene ; W. Li ; M. A. Malkan ; A. Pancoast ; D. J. Sand ; D. Stern ; T. Treu ; J.-H. Woo ; R. J. Assef ; H.-J. Bae ; B. J. Brewer ; S. B. Cenko ; K. I. Clubb ; M. C. Cooper ; A. M. Diamond-Stanic ; K. D. Hiner ; S. F. Hoenig ; E. Hsiao ; M. T. Kandrashoff ; M. S. Lazarova ; A. M. Nierenberg ; J. Rex ; J. M. Silverman ; E. J. Tollerud ; J. L. Walsh ;
Date:	3 Mar 2015
Abstract:	In the Spring of 2011 we carried out a 2.5 month reverberation mapping campaign using the 3 m Shane telescope at Lick Observatory, monitoring 15 low-redshift Seyfert 1 galaxies. This paper describes the observations, reductions and measurements, and data products from the spectroscopic campaign. The reduced spectra were fitted with a multicomponent model in order to isolate the contributions of various continuum and emission-line components. We present light curves of broad emission lines and the AGN continuum, and measurements of the broad H-beta line widths in mean and root-mean square (rms) spectra. For the most highly variable AGNs we also measured broad H-beta line widths and velocity centroids from the nightly spectra. In four AGNs exhibiting the highest variability amplitudes, we detect anticorrelations between broad H-beta width and luminosity, demonstrating that the broad-line region "breathes" on short timescales of days to weeks in response to continuum variations. We also find that broad H-beta velocity centroids can undergo substantial changes in response to continuum variations; in NGC 4593 the broad H-beta velocity shifted by ~250 km/s over a one-month duration. This reverberation-induced velocity shift effect is likely to contribute a significant source of confusion noise to binary black hole searches that use multi-epoch quasar spectroscopy to detect binary orbital motion. We also present results from simulations that examine biases that can occur in measurement of broad-line widths from rms spectra due to the contributions of continuum variations and photon-counting noise.
Source:	arXiv, 1503.1146
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