is matched with your lens/telescope toprevent over- or under-sampling of stars. I matched my Esprit100 with aZWO ASI2600MM-Prowhich with a 3.76µm pixel size is right in the sweet spot of resolution for the 550mm focal
Figure 3 (left panel) shows the locations of the clusters, with their ages indicated by the symbol size and color. Figure 3 (right panel) shows the ages of the clusters vs. their deprojected distance from the center of M31. The bulge has the oldest clusters, and the disk contains a ...