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Blue early-type galaxies with galaxy-scale ongoing star formation areinteresting targets in order to understand the stellar mass buildup inelliptical and S0 galaxies in the local Universe. We study the star-formingpopulation of blue early-type galaxies to understand the origin of starformation in these otherwise red and dead stellar systems. The legacy surveyimaging data taken with the dark energy camera in the $g$, $r$, and $z$ bandsfor 55 star-forming blue early-type galaxies were examined, and $g-r$ colormaps were created. We identified low surface brightness features near 37galaxies, faint-level interaction signatures near 15 galaxies, and structuresindicative of recent merger activity in the optical color maps of all 55galaxies. These features are not visible in the shallow Sloan Digital SkySurvey imaging data in which these galaxies were originally identified. Lowsurface brightness features found around galaxies could be remnants of recentmerger events. The star-forming population of blue early-type galaxies could bepost-merger systems that are expected to be the pathway for the formation ofelliptical galaxies. We hypothesize that the star-forming population of blueearly-type galaxies is a stage in the evolution of early-type galaxies. Themerger features will eventually disappear, fuel for star formation will cease,and the galaxy will move to the passive population of normal early-typegalaxies.

Deep optical imaging of star-forming blue early-type galaxies: Color map structures and faint features indicative of recent mergers