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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 2.

Metallicity map and Hα image (from P. Mazzei et al. 2018). The metallicity measures were obtained using the method described by R22 (see also S. L. Hoffmann et al. 2016) from strong nebular lines in H II regions at the locations indicated using Keck/LRIS.

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