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- W4386506427 abstract "Abstract We have found 50 new globular cluster (GC) candidates around M31 with Gaia Early Data Release 3 (EDR3), with the help of Pan-STARRS1 DR1 magnitudes and Pan-Andromeda Archaeological Survey (PAndAS) images. Based on the latest Revised Bologna Catalog and simbad , we trained two random forest (RF) classifiers, the first one to distinguish extended sources from point sources and the second one to further select GCs from extended sources. From 1.85 million sources of 16 m < g < 19.5 m and within a large area of ∼392 deg 2 around M31, we selected 20,658 extended sources and 1934 initial GC candidates. After visual inspection of the PAndAS images, to eliminate the contamination from noncluster sources, particularly galaxies, we finally got 50 candidates. These candidates are divided into three types (a, b, and c), according to their projected distance D to the center of M31 and their probability of being a true GC, P GC , which is calculated by our second RF classifier. Among these candidates, 14 are found to be associated (in projection) with the large-scale structures within the halo of M31. We also provide several simple parameter criteria for selecting extended sources effectively from Gaia EDR3, which can reach a completeness of 92.1% with a contamination fraction lower than 10%." @default.
- W4386506427 created "2023-09-08" @default.
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- W4386506427 date "2023-09-01" @default.
- W4386506427 modified "2023-09-26" @default.
- W4386506427 title "Searching for New Globular Clusters in M31 with Gaia EDR3" @default.
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- W4386506427 doi "https://doi.org/10.3847/1538-4357/ace963" @default.
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