First JWST Observations of JAGB Stars in the SN Ia Host Galaxies: NGC 7250, NGC 4536, NGC 3972

Understand

The J-region Asymptotic Giant Branch (JAGB) method is a standard candle that leverages the constant luminosities of color-selected, carbon-rich AGB stars, measured in the near infrared at 1.2 microns.

• The Chicago-Carnegie Hubble Program (CCHP) has obtained JWST imaging of the SN Ia host galaxies NGC 7250, NGC 4536, and NGC 3972.
• With these observations, the JAGB method can be studied for the first time using JWST.
• Lee et al.