MaNGA 8313-1901: Gas Accretion Observed in a Blue Compact Dwarf Galaxy?

Abstract Gas accretion is an important process in the evolution of galaxies, but it has limited direct observational evidences. In this paper, we report detection a possible ongoing gas event blue compact dwarf (BCD) galaxy, MaNGA 8313-1901, observed by Mapping Nearby Galaxies and Apache Point Observatory (MaNGA) program. This galaxy distinct off-centered clump to northeast (the NE clump) that shows low metallicity enhanced star formation. The kinematics also seems be detached from host BCD galaxy. Together with drop clump, suggests likely external origin, such as or interaction, rather than internal H II complex disk. After removing underlying component, find spectrum “pure” can match very well modeled containing stellar population young stars (≤7 Myr) only. may imply experiencing cold gas, instead merger involving galaxies significant preexisting old stars. We signs another SW at southwest corner two clumps share same origin accretion.