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The Lick AGN monitoring project 2011: spectroscopic campaign and emission-line light curves

The Lick AGN monitoring project 2011: spectroscopic campaign and emission-line light curves
The Lick AGN monitoring project 2011: spectroscopic campaign and emission-line light curves
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 active galactic nucleus (AGN) continuum, and measurements of the broad H? line widths in mean and rms spectra. For the most highly variable AGNs we also measured broad H? line widths and velocity centroids from the nightly spectra. In four AGNs exhibiting the highest variability amplitudes, we detect anticorrelations between broad H? 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? velocity centroids can undergo substantial changes in response to continuum variations; in NGC 4593, the broad H? velocity shifted by ~250 km s?1 over a 1 month period. 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.
0067-0049
1-32
Barth, Aaron J.
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Bennert, Vardha N.
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Canalizo, Gabriela
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Filippenko, Alexei V.
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Gates, Elinor L.
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Greene, Jenny E.
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Li, Weidong
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Malkan, Matthew A.
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Pancoast, Anna
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Sand, David J.
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Stern, Daniel
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Treu, Tommaso
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Woo, Jong-Hak
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Assef, Roberto J.
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Bae, Hyun-Jin
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Brewer, Brendon J.
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Cenko, S. Bradley
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Clubb, Kelsey I.
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Cooper, Michael C.
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Diamond-Stanic, Aleksandar M.
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Hiner, Kyle D.
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Hoenig, Sebastian
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Hsiao, Eric
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Kandrashoff, Michael T.
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Lazarova, Mariana S.
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Nierenberg, A. M.
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Rex, Jacob
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Silverman, Jeffrey M.
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Tollerud, Erik J.
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Walsh, Jonelle L.
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Barth, Aaron J.
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Bennert, Vardha N.
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Canalizo, Gabriela
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Filippenko, Alexei V.
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Gates, Elinor L.
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Greene, Jenny E.
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Li, Weidong
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Malkan, Matthew A.
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Pancoast, Anna
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Sand, David J.
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Stern, Daniel
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Treu, Tommaso
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Woo, Jong-Hak
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Assef, Roberto J.
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Bae, Hyun-Jin
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Brewer, Brendon J.
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Cenko, S. Bradley
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Clubb, Kelsey I.
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Cooper, Michael C.
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Hiner, Kyle D.
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Hoenig, Sebastian
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Hsiao, Eric
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Lazarova, Mariana S.
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Nierenberg, A. M.
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Rex, Jacob
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Silverman, Jeffrey M.
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Tollerud, Erik J.
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Walsh, Jonelle L.
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Barth, Aaron J., Bennert, Vardha N., Canalizo, Gabriela, Filippenko, Alexei V., Gates, Elinor L., Greene, Jenny E., Li, Weidong, Malkan, Matthew A., Pancoast, Anna, Sand, David J., Stern, Daniel, Treu, Tommaso, Woo, Jong-Hak, Assef, Roberto J., Bae, Hyun-Jin, Brewer, Brendon J., Cenko, S. Bradley, Clubb, Kelsey I., Cooper, Michael C., Diamond-Stanic, Aleksandar M., Hiner, Kyle D., Hoenig, Sebastian, Hsiao, Eric, Kandrashoff, Michael T., Lazarova, Mariana S., Nierenberg, A. M., Rex, Jacob, Silverman, Jeffrey M., Tollerud, Erik J. and Walsh, Jonelle L. (2015) The Lick AGN monitoring project 2011: spectroscopic campaign and emission-line light curves. The Astrophysical Journal Supplement Series, 217 (26), 1-32. (doi:10.1088/0067-0049/217/2/26).

Record type: Article

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 active galactic nucleus (AGN) continuum, and measurements of the broad H? line widths in mean and rms spectra. For the most highly variable AGNs we also measured broad H? line widths and velocity centroids from the nightly spectra. In four AGNs exhibiting the highest variability amplitudes, we detect anticorrelations between broad H? 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? velocity centroids can undergo substantial changes in response to continuum variations; in NGC 4593, the broad H? velocity shifted by ~250 km s?1 over a 1 month period. 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.

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Accepted/In Press date: 24 February 2015
Published date: 15 April 2015
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 402384
URI: https://eprints.soton.ac.uk/id/eprint/402384
ISSN: 0067-0049
PURE UUID: ad98d8cc-8e4a-4bf0-ac60-d758b5e9c435

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Date deposited: 07 Nov 2016 16:38
Last modified: 14 Aug 2019 18:03

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Contributors

Author: Aaron J. Barth
Author: Vardha N. Bennert
Author: Gabriela Canalizo
Author: Alexei V. Filippenko
Author: Elinor L. Gates
Author: Jenny E. Greene
Author: Weidong Li
Author: Matthew A. Malkan
Author: Anna Pancoast
Author: David J. Sand
Author: Daniel Stern
Author: Tommaso Treu
Author: Jong-Hak Woo
Author: Roberto J. Assef
Author: Hyun-Jin Bae
Author: Brendon J. Brewer
Author: S. Bradley Cenko
Author: Kelsey I. Clubb
Author: Michael C. Cooper
Author: Aleksandar M. Diamond-Stanic
Author: Kyle D. Hiner
Author: Eric Hsiao
Author: Michael T. Kandrashoff
Author: Mariana S. Lazarova
Author: A. M. Nierenberg
Author: Jacob Rex
Author: Jeffrey M. Silverman
Author: Erik J. Tollerud
Author: Jonelle L. Walsh

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