Concerning SH₀ES Data: Discrepant W_0,VI Absolute Magnitudes for Cepheids in the Keystone Galaxy NGC4258

2024/03/07 by Majaess, Daniel
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Solar and Stellar Astrophysics (astro-ph.SR)

paper · doi:10.48550/arxiv.2403.04834

Abstract

SH₀ES VI-band photometry for classical Cepheids in the keystone galaxy NGC4258 yield discrepant absolute magnitudes. Specifically, the 2016 and 2022 published SH₀ES Cepheid data for NGC4258 exhibit a substantial offset of ΔW_0,VI≃0^{\rm m}.3. That adds to a suite of existing concerns associated with the SH₀ES analysis, which in sum imply that their relatively non-changing Hubble constant for nearly twenty years warrants scrutiny.

Related

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• Doubly Discordant SH0ES NGC4258 Cepheid Relations (HVI), and Impactful Extinction Laws
• A Cepheid systematics-free test of H₀ to \lesssim2.5% accuracy using SH0ES photometry
• The Cepheids of Centaurus A (NGC 5128) and Implications for H0
• 1.8 per cent measurement of H₀ from Cepheids alone