The Tip of the Red Giant Branch

TL;DR

This paper reviews recent calibrations of the Tip of the Red Giant Branch as a standard candle across optical and near-infrared bands, discussing their agreement and potential extension to SDSS filters.

Contribution

It provides a comprehensive overview of the latest empirical calibrations of the TRGB and explores extending these calibrations to SDSS photometric bands.

Findings

Good agreement among independent calibrations when uncertainties are considered

Calibration extension to SDSS (i,z) bands is feasible

Empirical calibrations are reliable across multiple bands

Abstract

I review the latest results on the calibration of the Tip of the Red Giant Branch as a standard candle, in the optical and in the near infrared. The agreement among different and independent empirical calibrations is rather good, if all the uncertainties are taken into account. The possible extension of the calibration to SDSS photometric bands (i,z) is also discussed.