The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). IV. Star Cluster Catalog
Bell, Eric F.; Williams, Benjamin F.; Johnson, L. Clifton; Seth, Anil C.; Weisz, Daniel R.; Dalcanton, Julianne J.; Skillman, Evan; Guhathakurta, Puragra; Durbin, Meredith J.; Smercina, Adam; Wainer, Tobin M.; Torresvillanueva, Estephani E.; Phatter Collaboration
United States
Abstract
We construct a catalog of star clusters from Hubble Space Telescope images of the inner disk of the Triangulum Galaxy (M33) using image classifications collected by the Local Group Cluster Search, a citizen science project hosted on the Zooniverse platform. We identify 1214 star clusters within the Hubble Space Telescope imaging footprint of the Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER) survey. Comparing this catalog to existing compilations in the literature, 68% of the clusters are newly identified. The final catalog includes multiband aperture photometry and fits for cluster properties via integrated light spectral energy distribution fitting. The cluster catalog's 50% completeness limit is ~1500 M ☉ at an age of 100 Myr, as derived from comprehensive synthetic cluster tests.