Exploring the limits of AGN feedback: black holes and the star formation histories of low-mass galaxies

Abstract

Energy feedback, either from active galactic nuclei (AGN) or from supernovae, is required to understand galaxy formation within a $\Lambda$-Cold Dark Matter cosmology. We study a sample of 127 low-mass galaxies, comparing their stellar populations properties to the mass of the central supermassive black hole, in order to investigate the effect of AGN feedback. We find a loose coupling between star formation history and black hole mass, which seems to suggest that AGN activity does not dominate baryonic cooling in low-mass galaxies. We also find that a break in the $M_{\bullet }$-$\sigma$ relation marks a transitional stellar mass, M${}_{\mathrm{trans}}=3.4\pm 2.1\times 10^{10}$ M${}_{\odot }$, remarkably similar to M${}_{\star }$. Our results are in agreement with a bi-modal star formation process where the AGN-dominated feedback of high-mass galaxies transitions towards a supernovae-driven regime in low-mass systems, as suggested by numerical simulations.

5 pages, 4 figures. Accepted for publication in ApJL

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