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The Perfect Host: JWST Cepheid Observations in a Background-free Type Ia Supernova Host Confirm No Bias in Hubble-constant Measurements

  • Authors: Adam G. Riess, Siyang Li, Gagandeep S. Anand, Wenlong Yuan, Louise Breuval, Stefano Casertano, Lucas M. Macri, Dan Scolnic, Yukei S. Murakami, Alexei V. Filippenko, Thomas G. Brink

Adam G. Riess et al 2025 The Astrophysical Journal Letters 992 .

  • Provider: AAS Journals

Caption: Figure 8.

Reddening-free (Wesenheit) P–L relations for three levels of crowding in NGC 3447. The points in light gray are from HST measurements in F160W as given by R22. In blue are Cepheids observed with JWST F150W in the spiral host, and in red are those observed in the tidal host, NGC 3447A. All three samples yield consistent distance measures but with decreasing levels of P–L noise.

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