Paper:	The Mass of the Black Hole in NGC 4593 Using Reverberation Mapping
Volume:	373, The Central Engine of Active Galactic Nuclei
Page:	23
Authors:	Denney, K.D.; Bentz, M.C.; Peterson, B.M.; Pogge, R.W.
Abstract:	We present new observations leading to an improved black hole mass estimate for the Seyfert 1 galaxy NGC 4593 as part of a reverberation mapping campaign conducted at the MDM Observatory, Crimean Astrophysical Observatory, and with the MAGNUM telescope at Haleakala Observatories. Cross-correlation analysis of the Hβ emission-line light curve with the optical continuum light curve reveals an emission-line time delay of τcent = 3.73 ± 0.75 days. By combining this time delay with the Hβ line width, we derive a central black hole mass of MBH = (9.8 ± 2.1) × 106M⊙, an improvement in precision of a factor of several over past results.

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