The Cepheid Distance to the Seyfert 1 Galaxy NGC 4151
Wenlong Yuan, Michael M. Fausnaugh, Samantha L. Hoffmann, Lucas M., Macri, Bradley M. Peterson, Adam G. Riess, Misty C. Bentz, Jonathan S. Brown,, Elena Dalla Bont\`a, Richard I. Davies, Gisella de Rosa, Laura Ferrarese,, Catherine J. Grier, Erin K. S. Hicks

TL;DR
This paper measures the distance to NGC 4151 using near-infrared Cepheid variables observed with Hubble, providing a key calibration for black hole mass and AGN dynamics studies.
Contribution
It presents a new, precise distance measurement to NGC 4151 using Cepheid variables, aiding calibration of black hole mass and AGN feedback models.
Findings
Distance to NGC 4151 is 15.8 Mpc with 0.4 Mpc uncertainty.
Distance based on 35 long-period Cepheids.
Supports calibration of black hole mass and AGN activity studies.
Abstract
We derive a distance of 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 (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 nucleus.
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