Tuesday

Despite being the dominant galaxy population by number in groups and clusters, the formation and quenching mechanism of dwarf galaxies (M* less than 5e9 Msun) remains unknown. Evidence is emerging that many of these galaxies host AGN, yet the role that AGN feedback plays in their evolution and quenching is unclear. Using data from the SDSS-IV MaNGA IFU survey, we have identified a sample of 63 low-mass (M* less than 5e9 Msun ), quenched galaxies fainter than Mr = -19. In this presentation, I will show that 14 galaxies in this sample exhibit an ionised gas component, of which 7 have AGN-like line strength ratios at their centres. Six of these low-mass AGN host galaxies have signatures of ongoing gas accretion, yet do not exhibit any star formation throughout their structures. We suggest that AGN feedback is preventing further episodes of star formation in these accreting galaxies, and that maintenance mode feedback from AGN is therefore important in maintaing quiescence in dwarf galaxies. I will show that despite being the "simplest" galaxies in our current models of galaxy formation, these quenched dwarf galaxies are a diverse population, with detailed, spatially resolved spectroscopy and modelling crucial to understand their evolution.