THE lick AGN monitoring project 2011: Spectroscopic campaign and emission-line light curves

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

Research output: Contribution to journalArticle

59 Citations (Scopus)

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 Hβ line widths in mean and rms spectra. For the most highly variable AGNs we also measured broad Hβ line widths and velocity centroids from the nightly spectra. In four AGNs exhibiting the highest variability amplitudes, we detect anticorrelations between broad Hβ 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 Hβ velocity centroids can undergo substantial changes in response to continuum variations; in NGC 4593, the broad Hβ 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.

Original languageEnglish (US)
Article number26
JournalAstrophysical Journal, Supplement Series
Volume217
Issue number2
DOIs
StatePublished - Apr 1 2015

Fingerprint

active galactic nuclei
light curve
continuums
H lines
monitoring
reverberation
centroids
data products
confusion
observatory
spectroscopy
quasars
timescale
observatories
counting
luminosity
time measurement
project
telescopes
galaxies

Keywords

  • galaxies: Seyfert
  • galaxies: active
  • galaxies: nuclei
  • techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Barth, A. J., Bennert, V. N., Canalizo, G., Filippenko, A. V., Gates, E. L., Greene, J. E., ... Walsh, J. L. (2015). THE lick AGN monitoring project 2011: Spectroscopic campaign and emission-line light curves. Astrophysical Journal, Supplement Series, 217(2), [26]. https://doi.org/10.1088/0067-0049/217/2/26

THE lick AGN monitoring project 2011 : Spectroscopic campaign and emission-line light curves. / 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.; Honig, Sebastian F.; Hsiao, Eric; Kandrashoff, Michael T.; Lazarova, Mariana S.; Nierenberg, A. M.; Rex, Jacob; Silverman, Jeffrey M.; Tollerud, Erik J.; Walsh, Jonelle L.

In: Astrophysical Journal, Supplement Series, Vol. 217, No. 2, 26, 01.04.2015.

Research output: Contribution to journalArticle

Barth, AJ, Bennert, VN, Canalizo, G, Filippenko, AV, Gates, EL, Greene, JE, Li, W, Malkan, MA, Pancoast, A, Sand, DJ, Stern, D, Treu, T, Woo, JH, Assef, RJ, Bae, HJ, Brewer, BJ, Cenko, SB, Clubb, KI, Cooper, MC, Diamond-Stanic, AM, Hiner, KD, Honig, SF, Hsiao, E, Kandrashoff, MT, Lazarova, MS, Nierenberg, AM, Rex, J, Silverman, JM, Tollerud, EJ & Walsh, JL 2015, 'THE lick AGN monitoring project 2011: Spectroscopic campaign and emission-line light curves', Astrophysical Journal, Supplement Series, vol. 217, no. 2, 26. https://doi.org/10.1088/0067-0049/217/2/26
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. ; Honig, Sebastian F. ; Hsiao, Eric ; Kandrashoff, Michael T. ; Lazarova, Mariana S. ; Nierenberg, A. M. ; Rex, Jacob ; Silverman, Jeffrey M. ; Tollerud, Erik J. ; Walsh, Jonelle L. / THE lick AGN monitoring project 2011 : Spectroscopic campaign and emission-line light curves. In: Astrophysical Journal, Supplement Series. 2015 ; Vol. 217, No. 2.
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AU - Barth, Aaron J.

AU - Bennert, Vardha N.

AU - Canalizo, Gabriela

AU - Filippenko, Alexei V.

AU - Gates, Elinor L.

AU - Greene, Jenny E.

AU - Li, Weidong

AU - Malkan, Matthew A.

AU - Pancoast, Anna

AU - Sand, David J.

AU - Stern, Daniel

AU - Treu, Tommaso

AU - Woo, Jong Hak

AU - Assef, Roberto J.

AU - Bae, Hyun Jin

AU - Brewer, Brendon J.

AU - Cenko, S. Bradley

AU - Clubb, Kelsey I.

AU - Cooper, Michael C.

AU - Diamond-Stanic, Aleksandar M.

AU - Hiner, Kyle D.

AU - Honig, Sebastian F.

AU - Hsiao, Eric

AU - Kandrashoff, Michael T.

AU - Lazarova, Mariana S.

AU - Nierenberg, A. M.

AU - Rex, Jacob

AU - Silverman, Jeffrey M.

AU - Tollerud, Erik J.

AU - Walsh, Jonelle L.

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KW - galaxies: active

KW - galaxies: nuclei

KW - techniques: spectroscopic

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