Letters of the Astrophysical Journal
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 ii λ 4686 broad emission line relative to the optical continuum to be 2.7 °æ 0.6 days and the lag in the Hβλ 4861 broad emission line to be 13.9 °æ 0.9 days. Combined with the line width, the He ii lag yields a black hole mass MBH = (2. 6 °æ 0. 8) °ø 107M . This measurement is consistent with measurements made using the Hβλ 4861 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.
Grier, C. J.; Peterson, B. M.; Pogge, R. W.; Denney, K. D.; Bentz, M. C.; Martini, Paul; Sergeev, S. G.; Kaspi, S.; Zu, Y.; Kochanek, C. S.; Shappee, B. J.; Salvo, C. Araya; Beatty, T G.; Bird, J. C.; Bord, D. J.; Borman, G. A.; Che, X.; and Chen, C., "A Reverberation Lag for The High-Ionization Component of the Broad-Line Region in the Narrow-Line Seyfert 1 Mrk 335" (2012). Open Dartmouth: Faculty Open Access Articles. 2511.