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Dr. Deep Anand
@styrofoamplates.bsky.social
Senior Staff Scientist working on Hubble. views are my own.
200 followers133 following52 posts

hey everyone, if you're interested in the Hubble Tension, *please* see this paper we just put out. 🔭 🧪 arxiv.org/abs/2408.11770

paper title and abstract:

JWST Validates HST Distance Measurements: Selection of Supernova Subsample Explains Differences in JWST Estimates of Local H0

Adam G. Riess, Dan Scolnic, Gagandeep S. Anand, Louise Breuval, Stefano Casertano, Lucas M. Macri, Siyang Li, Wenlong Yuan, Caroline D. Huang, Saurabh Jha, Yukei S. Murakami, Rachael Beaton, Dillon Brout, Tianrui Wu, Graeme E. Addison, Charles Bennett, Richard I. Anderson, Alexei V. Filippenko, Anthony Carr

JWST provides new opportunities to cross-check the HST Cepheid/SNeIa distance ladder, which yields the most precise local measure of H0. We analyze early JWST subsamples (~1/4 of the HST sample) from the SH0ES and CCHP groups, calibrated by a single anchor (N4258). We find HST Cepheid distances agree well (~1 sigma) with all 8 combinations of methods, samples, and telescopes: JWST Cepheids, TRGB, and JAGB by either group, plus HST TRGB and Miras. The comparisons explicitly include the measurement uncertainty of each method in N425
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the CCHP group recently put out a paper with lower H0 values, but we find that their distances are totally consistent with HST Cepheids (and all other methods in the paper- TRGB, JAGB, Cepheids, Miras). the issue is just their very small sample size was already biased towards lower H0 values.

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DD
Dr. Deep Anand
@styrofoamplates.bsky.social
Senior Staff Scientist working on Hubble. views are my own.
200 followers133 following52 posts