A reverberation lag for the high-ionization component of the broad-line region in the narrow-line seyfert 1Mrk 335

C. J. Grier, B. M. Peterson, R. W. Pogge, K. D. Denney, M. C. Bentz, Paul Martini, S. G. Sergeev, S. Kaspi, Y. Zu, C. S. Kochanek, B. J. Shappee, K. Z. Stanek, C. Araya Salvo, T. G. Beatty, J. C. Bird, D. J. Bord, G. A. Borman, X. Che, C. Chen, S. A. CohenM. Dietrich, V. T. Doroshenko, Yu S. Efimov, N. Free, I. Ginsburg, C. B. Henderson, Keith Horne, A. L. King, K. Mogren, M. Molina, A. M. Mosquera, S. V. Nazarov, D. N. Okhmat, O. Pejcha, S. Rafter, J. C. Shields, J. Skowron, D. M. Szczygiel, M. Valluri, J. L. Van Saders

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Abstract

We present the first results from a detailed analysis of photometric and spectrophotometric data on the narrow-line Seyfert 1 (NLS1) galaxy Mrk 335, collected over a 120 day span in the fall of 2010. From these data we measure the lag in the He IIλ4686 broad emission line relative to the optical continuum to be 2.7 ± 0.6days and the lag in the Hβλ4861 broad emission line to be 13.9 ± 0.9days. Combined with the line width, the He II lag yields a black hole mass M BH = (2.6 ± 0.8) × 107 M . This measurement is consistent with measurements made using the Hβλ4861 line, suggesting that the He II emission originates in the same structure as Hβ, but at a much smaller radius. This constitutes the first robust lag measurement for a high-ionization line in an NLS1 galaxy and supports a scenario in which the He II emission originates from gas in virial motion rather than outflow.

Original languageEnglish (US)
Article numberL4
JournalAstrophysical Journal Letters
Volume744
Issue number1
DOIs
StatePublished - Jan 1 2012

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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