NGC 474 - 470 are currently undergoing an interaction. A tail of gas connects the spiral (NGC 470) with the gas poor lenticular galaxy (NGC 474). HAlpha emissions indicate a secondary accretion in the core of NGC 474.
Note the two shells at 1 o'clock and 6 o'clock associated with NGC 474, these shells may be due to the secondary accertion in NGC 470. (Rampazzo 2006)