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. Cross-correlation analysis of the Hβ emission-line light curve with the optical continuum light curve reveals an emission-line time delay of τ cent = 3.73 ± 0.75 days. By combining this time delay with the Hβ line width, we derive a central black hole mass of M BH = (9.8 ± 2.1) × 10 6 M ☉ , an improvement in precision of a factor of several over past results.
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Denney et al. (2006) studied this question.
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