The glow to the lower right is a larger (closer?) galaxy that it’s interacting with, NGC 4490.
Data used:
HST_10579_07_ACS_WFC_F435W_sci
HST_10579_07_ACS_WFC_F606W_sci
Copyright information:
Hubble data is public domain, but I put a lot of work into combining it into beautiful color images. The minimal credit line should read: NASA / ESA / J. Schmidt
This work is licensed under a Creative Commons Attribution 3.0 Unported License.