Kavli Affiliate: Wendy L. Freedman
| First 5 Authors: Barry F. Madore, Wendy L. Freedman, Kayla Owens, ,
| Summary:
Given the recent successful launch of the James Webb Space Telescope,
determining robust calibrations of the slopes and absolute magnitudes of the
near- to mid-infrared Tip of the Red Giant Branch (TRGB) will be essential to
measuring precise extragalactic distances via this method. Using ground-based
data of the Large Magellanic Cloud from the Magellanic Clouds Photometric
Survey along with near-infrared (NIR) data from 2MASS and mid-infrared (MIR)
data collected as a part of the SAGE survey using the Spitzer Space Telescope,
we present slopes and zero-points for the TRGB in the optical (VI), NIR (JHK)
and MIR ([3.6] & [4.5]) bandpasses. These calibrations utilize stars +0.3 +/-
0.1 mag below the tip, providing a substantial statistical improvement over
previous calibrations which only used the sample of stars narrowly encompassing
the tip.
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