The Cepheid Distance to the Seyfert 1 Galaxy NGC 4151

Kavli Affiliate: Michael M. Fausnaugh

| First 5 Authors: Wenlong Yuan, Michael M. Fausnaugh, Samantha L. Hoffmann, Lucas M. Macri, Bradley M. Peterson

| Summary:

We derive a distance of $15.8pm0.4$ Mpc to the archetypical Seyfert 1 galaxy
NGC 4151 based on the near-infrared Cepheid Period-Luminosity relation and new
Hubble Space Telescope multiband imaging. This distance determination, based on
measurements of 35 long-period ($P > 25$d) Cepheids, will support the absolute
calibration of the supermassive black hole mass in this system, as well as
studies of the dynamics of the feedback or feeding of its active galactic

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