Document Type


Journal/Book Title/Conference

227th American Astronomical Society Conference

Publication Date



We measured Surface Brightness FluctuaIons (SBF) in three galaxies, ESO137-G006, NGC 3309, and NGC 5128, using the GeMS MulI-Conjugate AdapIve OpIcs (MCAO) system on the Gemini South telescope. ESO137-G006 is located in the Norma Cluster, NGC 3309 is located in the Hydra Cluster, while NGC 5128, also known as Centaurus A, is a nearby galaxy with numerous other distance measurements, including Cepheids. These galaxies were observed as a path finder to establish the SBF technique using the MCAO system. The J and Ks-band images taken with MCAO were astrometrically corrected and combined using the THELI so_ware.1 This method allowed us to accurately account for the distortions of the focal plane when combining the images. The foreground stars as well as the globular clusters were measured to account for their contribuIon to the SBF. (J-Ks) color measurements were made to calibrate SBF and determine the stellar populaIons of the galaxies. The results of these measurements give us an SBF calibraIon that we can use to measure the distances to much more distant galaxies.