Kavli Affiliate: Wendy L. Freedman
| First 5 Authors: Taylor J. Hoyt, In Sung Jang, Wendy L. Freedman, Barry F. Madore, Kayla A. Owens
| Summary:
We present distances to ten supernova (SN) host galaxies determined via the
red giant branch tip (TRGB) using JWST/NIRCAM and the F115W, F356W, and F444W
bandpasses. Our analysis, including photometric catalog cleaning, adoption of
disk light profiles, TRGB color slope estimation, and a novel technique for
identifying the infrared TRGB, was conducted blinded. The new F115W TRGB
distances agree well with our previously derived HST TRGB distances, differing
by only 1 percent on average and 4 percent on a per-galaxy basis. The
color-corrected F115W TRGB is therefore equally precise a method of distance
measurement as, and offers unique advantages over, its color-insensitive,
I-band counterpart. Using these distances, we update the absolute calibrations
of eleven calibrator SNe, yielding 68.4 < H0 < 69.6 km/s/Mpc depending on which
of four sets of SN magnitudes are used. We expand the sample of calibrator SNe
to 24 by combining with HST TRGB distances. Doing so increases our H0 estimate
based on the Carnegie Supernova Project II (CSP-II) by 0.8 km/s/Mpc (1.4 sigma)
demonstrating that our JWST H0 based on 11 SNe is not significantly biased
toward lower values. In contrast, the Pantheon+ calibration shifts higher by +2
km/s/Mpc (3.1 sigma), a significantly larger increase than seen in both the CSP
and the Pantheon team’s own SuperCal analysis. More JWST observations of the
TRGB as well as independent analyses of low-redshift SNe are needed to continue
unraveling the true nature of the Hubble Tension.
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