Small Galaxy seems to overtake and merge a bigger one

an arm of merging process is clearly visible on the left side of the bigger galaxy. What can be a mechanism for a smaller galaxy to attract bigger one? Maybe bigger mass in the center?

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Spectacular blue starburst area / galaxy there!

If you zoom out a bit and use ‘SDSS spectra’ you can see the galaxy at 4 o’clock direction has the same redshift as the blue area. So it is possible that one flew past the centre galaxy and created this mess :slight_smile: