The outer halo globular cluster system of M31 - I. The final PAndAS catalogue
A. P. Huxor, A. D. Mackey, A. M. N. Ferguson, M. J. Irwin, N. F., Martin, N. R. Tanvir, J. Veljanoski, A. McConnachie, C. K. Fishlock, R. Ibata, and G. F. Lewis

TL;DR
This paper presents a comprehensive catalog of 59 new globular clusters in M31's halo, analyzing their properties and distribution, and providing insights into galaxy formation and accretion processes.
Contribution
It offers the first uniform census of GCs in M31's halo, extending to 150 kpc, with detailed photometry and analysis of their luminosity function and origins.
Findings
GCs detected up to 150 kpc from M31 center
Outer halo GCs show bimodal luminosity function
Presence of luminous GCs with no Milky Way counterparts
Abstract
We report the discovery of 59 globular clusters (GCs) and two candidate GCs in a search of the halo of M31, primarily via visual inspection of CHFT/MegaCam imagery from the Pan-Andromeda Archaeological Survey (PAndAS). The superior quality of these data also allow us to check the classification of remote objects in the Revised Bologna Catalogue (RBC), plus a subset of GC candidates drawn from SDSS imaging. We identify three additional new GCs from the RBC, and confirm the GC nature of 11 SDSS objects (8 of which appear independently in our remote halo catalogue); the remaining 188 candidates across both lists are either foreground stars or background galaxies. Our new catalogue represents the first uniform census of GCs across the M31 halo - we find clusters to the limit of the PAndAS survey area at projected radii of up to R_proj ~ 150 kpc. Tests using artificial clusters reveal that…
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