PHAT Stellar Cluster Survey. II. Andromeda Project Cluster Catalog
L. Clifton Johnson, Anil C. Seth, Julianne J. Dalcanton, Matthew L., Wallace, Robert J. Simpson, Chris J. Lintott, Amit Kapadia, Evan D. Skillman,, Nelson Caldwell, Morgan Fouesneau, Daniel R. Weisz, Benjamin F. Williams,, Lori C. Beerman, Dimitrios A. Gouliermis, Ata Sarajedini

TL;DR
This paper presents a comprehensive catalog of 2,753 stellar clusters in Andromeda, created through citizen science classifications, high-resolution imaging, and extensive photometric analysis, significantly expanding known clusters in the galaxy.
Contribution
The study introduces a robust, crowd-sourced method for identifying and cataloging star clusters in Andromeda using Hubble data, increasing the known cluster count by a factor of six.
Findings
Catalog includes 2,753 clusters and 2,270 background galaxies.
The catalog is 50% complete down to ~500 solar masses for young clusters.
High-resolution imaging enables detailed photometric measurements across six filters.
Abstract
We construct a stellar cluster catalog for the Panchromatic Hubble Andromeda Treasury (PHAT) survey using image classifications collected from the Andromeda Project citizen science website. We identify 2,753 clusters and 2,270 background galaxies within ~0.5 deg of PHAT imaging searched, or ~400 kpc in deprojected area at the distance of the Andromeda galaxy (M31). These identifications result from 1.82 million classifications of ~20,000 individual images (totaling ~7 gigapixels) by tens of thousands of volunteers. We show that our crowd-sourced approach, which collects >80 classifications per image, provides a robust, repeatable method of cluster identification. The high spatial resolution Hubble Space Telescope images resolve individual stars in each cluster and are instrumental in the factor of ~6 increase in the number of clusters known within the survey footprint. We…
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