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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 4.

Color-coded identity of stars in the NIRCam field of NGC 3447. Regions follow the definitions in Section 2.1. As shown, the Cepheids in tidal host NGC 3447A (upper right) are free of contamination from common RGB stars with F090W₀ > 27.55 mag and 0.7 < (F090W − F150W)₀ < 2.0 mag.

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