The Seyfert 1 galaxy Zw 229-015 is among the brightest active galaxies being monitored by the Kepler mission. In order to determine the black hole mass in Zw 229-015 from Hβ reverberation mapping, we have carried out nightly observations with the Kast Spectrograph at the Lick 3 m telescope during the dark runs from 2010 June through December, obtaining 54 spectroscopic observations in total. We have also obtained nightly V-band imaging with the Katzman Automatic Imaging Telescope at Lick Observatory and with the 0.9 m telescope at the Brigham Young University West Mountain Observatory over the same period. We detect strong variability in the source, which exhibited more than a factor of two change in broad Hβ flux. From cross-correlation measurements, we find that the Hβ light curve has a rest-frame lag of 3.86+0.69-0.90 days with respect to the V-band continuum variations. We also measure reverberation lags for Hα and Hγ and find an upper limit to the Hδ lag. Combining the Hβ lag measurement with a broad Hβ width of σline = 1590 ± 47 km s-1 measured from the rms variability spectrum, we obtain a virial estimate of M BH = 1.00+0.19-0.24 × 107 M⊙ for the black hole in Zw 229-015. As a Kepler target, Zw 229-015 will eventually have one of the highest-quality optical light curves ever measured for any active galaxy, and the black hole mass determined from reverberation mapping will serve as a benchmark for testing relationships between black hole mass and continuum variability characteristics in active galactic nuclei. © 2011. The American Astronomical Society. All rights reserved.

Barth, A., Nguyen, M., Malkan, M., Filippenko, A., Li, W., Gorjian, V., et al. (2011). Broad-line reverberation in the Kepler-field Seyfert galaxy Zw 229-015. THE ASTROPHYSICAL JOURNAL, 732(2), 121 [10.1088/0004-637X/732/2/121].

Broad-line reverberation in the Kepler-field Seyfert galaxy Zw 229-015

Fumagalli M.;
2011

Abstract

The Seyfert 1 galaxy Zw 229-015 is among the brightest active galaxies being monitored by the Kepler mission. In order to determine the black hole mass in Zw 229-015 from Hβ reverberation mapping, we have carried out nightly observations with the Kast Spectrograph at the Lick 3 m telescope during the dark runs from 2010 June through December, obtaining 54 spectroscopic observations in total. We have also obtained nightly V-band imaging with the Katzman Automatic Imaging Telescope at Lick Observatory and with the 0.9 m telescope at the Brigham Young University West Mountain Observatory over the same period. We detect strong variability in the source, which exhibited more than a factor of two change in broad Hβ flux. From cross-correlation measurements, we find that the Hβ light curve has a rest-frame lag of 3.86+0.69-0.90 days with respect to the V-band continuum variations. We also measure reverberation lags for Hα and Hγ and find an upper limit to the Hδ lag. Combining the Hβ lag measurement with a broad Hβ width of σline = 1590 ± 47 km s-1 measured from the rms variability spectrum, we obtain a virial estimate of M BH = 1.00+0.19-0.24 × 107 M⊙ for the black hole in Zw 229-015. As a Kepler target, Zw 229-015 will eventually have one of the highest-quality optical light curves ever measured for any active galaxy, and the black hole mass determined from reverberation mapping will serve as a benchmark for testing relationships between black hole mass and continuum variability characteristics in active galactic nuclei. © 2011. The American Astronomical Society. All rights reserved.
Si
Articolo in rivista - Articolo scientifico
Scientifica
galaxies: active; galaxies: individual (Zw 229-015); galaxies: nuclei
English
121
Barth, A., Nguyen, M., Malkan, M., Filippenko, A., Li, W., Gorjian, V., et al. (2011). Broad-line reverberation in the Kepler-field Seyfert galaxy Zw 229-015. THE ASTROPHYSICAL JOURNAL, 732(2), 121 [10.1088/0004-637X/732/2/121].
Barth, A; Nguyen, M; Malkan, M; Filippenko, A; Li, W; Gorjian, V; Joner, M; Bennert, V; Botyanszki, J; Cenko, S; Childress, M; Choi, J; Comerford, J; Cucciara, A; Da Silva, R; Duchene, G; Fumagalli, M; Ganeshalingam, M; Gates, E; Gerke, B; Griffith, C; Harris, C; Hintz, E; Hsiao, E; Kandrashoff, M; Keel, W; Kirkman, D; Kleiser, I; Laney, C; Lee, J; Lopez, L; Lowe, T; Moody, J; Morton, A; Nierenberg, A; Nugent, P; Pancoast, A; Rex, J; Rich, R; Silverman, J; Smith, G; Sonnenfeld, A; Suzuki, N; Tytler, D; Walsh, J; Woo, J; Yang, Y; Zeisse, C
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/295230
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