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. Cohen, M. 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
We present the first results from a detailed analysis of photometric and
spectrophotometric data on the narrow-line Seyfert 1 galaxy Mrk 335, collected
over a 120-day span in the fall of 2010. From these data we measure the lag in
the He II 4686 broad emission line relative to the optical continuum to be 2.7
\pm 0.6 days and the lag in the H\beta 4861 broad emission line to be 13.9 \pm
0.9 days. Combined with the line width, the He II lag yields a black hole mass,
MBH = (2.6 \pm 0.8)\times 10^7 Msun. This measurement is consistent with
measurements made using the H\beta 4861 line, suggesting that the He II
emission originates in the same region as H\beta, but at a much smaller radius.
This constitutes the first robust lag measurement for a high-ionization line in
a narrow-line Seyfert 1 galaxy.
View original:
http://arxiv.org/abs/1110.6179
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