The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER). IV. Star Cluster Catalog

PHATTER Collaboration

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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.

Original languageEnglish (US)
Article number81
JournalAstrophysical Journal
Issue number1
StatePublished - Oct 1 2022

Bibliographical note

Funding Information:
We enthusiastically thank the ∼2800 LGCS volunteers who made this work possible. Their contributions are acknowledged individually at . This publication uses data generated via the platform, the development of which is funded by generous support, including a Global Impact Award from Google, and by a grant from the Alfred P. Sloan Foundation. Support for this work was provided by NASA through grant number HST-GO-14610 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555. L.C.J. acknowledges support through a CIERA Postdoctoral Fellowship at Northwestern University. This material is partially based on work by T.M.W. as a CIERA REU student at Northwestern University, supported by the National Science Foundation under grant No. AST-1757792. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). This research made use of NASA’s Astrophysics Data System (ADS) bibliographic services.

Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.


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