A closer look at galaxy M64’s outer disk shows that it came from a smaller dwarf galaxy
Bottom center : gri color mosaic of observations taken with Subaru HSC in the deepest of the three fields, Field 3. M64 is visible at the top of the field, which is ∼115 kpc across at its widest, with much of the diffuse brightness associated with the disk subtracted off as part of the reduction. Obfuscating Galactic cirrus is visible as diffuse filamentary features over much of the field, the color of which complicates inferences of M64’s stellar halo from integrated light. The observations are displayed with a…
