Measurement of the Half-Light Radius for the Tucana Dwarf Spheroidal Galaxy

TL;DR

This paper reports a new measurement of the Tucana Dwarf galaxy's half-light radius using combined wide-field and HST data, refining previous estimates with increased accuracy.

Contribution

The study introduces a more precise measurement of the Tucana Dwarf's half-light radius by combining diverse imaging datasets and applying elliptical fitting and Sersic profile analysis.

Findings

Half-light radius measured as 0.89 arcmin (225.7 pc) with improved accuracy.

Measurement is approximately 10% larger than previous estimates.

Utilizes combined wide-field and archival HST imaging for analysis.

Abstract

We present a new measurement of the half-light radius of the Tucana Dwarf galaxy, based on the combination of wider, deeper imaging conducted as part of the Local Volume Complete Cluster Survey (LoVoCCS) and HST archival images. We obtain a stellar density profile within the Tucana Dwarf field based on elliptical fitting. After background subtraction, we fit a S\'ersic profile to the density profile to obtain the half-light radius. We measure the half-light radius to be $0.89_{-0.02}^{+0.06}$ arcmin, corresponding to a value of $R_{e} = 225.7_{-5.5}^{+14.4}$ pc (95% CL). Given the wider-field observations from LoVoCCS used in this analysis, our measurement of the half-light radius represents a $\sim 10 \%$ increased value from the previous results.