Compact Star Clusters in the M31 Disk
V. Vansevicius (1,2), K. Kodaira (3), D. Narbutis (1,2), R. Stonkute, (1), A. Bridzius (1), V. Deveikis (2), D. Semionov (1) ((1) Inst. of Physics,, Lithuania, (2) Vilnius Univ. Obs., Lithuania, (3) The Graduate Univ. for, Advanced Studies, Japan)

TL;DR
This study surveys compact star clusters in M31's disk, revealing a diverse age range and a rich population of intermediate-mass clusters, highlighting differences from the Milky Way.
Contribution
First high-resolution survey of compact star clusters in M31 covering ~15% of the galaxy's disk, providing detailed photometric and age data.
Findings
Clusters range from 5 Myr to 10 Gyr in age.
Masses peak around 4000 solar masses.
Intermediate-mass clusters are abundant in M31.
Abstract
We have carried out a survey of compact star clusters (apparent size <3 arcsec) in the southwest part of the M31 galaxy, based on the high-resolution Suprime-Cam images (17.5 arcmin x 28.5 arcmin), covering ~15% of the deprojected galaxy disk area. The UBVRI photometry of 285 cluster candidates (V < 20.5 mag) was performed using frames of the Local Group Galaxies Survey. The final sample, containing 238 high probability star cluster candidates (typical half-light radius r_h ~ 1.5 pc), was selected by specifying a lower limit of r_h > 0.15 arcsec (>0.6 pc). We derived cluster parameters based on the photometric data and multiband images by employing simple stellar population models. The clusters have a wide range of ages from ~5 Myr (young objects associated with 24 um and/or Ha emission) to ~10 Gyr (globular cluster candidates), and possess mass in a range of 3.0 < log(m/M_sol) < 4.3…
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