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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 5.

NIR postage stamps of Cepheids in NGC 3447 that illustrate the three levels of crowding in this study. The left panel shows a Cepheid observed with HST in the spiral component of NGC 3447. In the middle panel, we see the same Cepheid observed with JWST NIRCAM at the same wavelength. In the right-hand panel is a Cepheid of similar period in the tidal host, NGC 3447A, illustrating the lack of a stellar background.

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