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We have selected a sample of X-ray emitting active galactic nuclei (AGNs) inlow-mass host galaxies (5e9-2e10 Msun) out to z~1. By comparing to AGNs in moremassive hosts, we have found that the AGN spatial number density and thefraction of galaxies hosting AGNs depends strongly on the host mass, with theAGN host mass function peaking at intermediate mass and with the AGN fractionincreasing with host mass. AGNs in low-mass hosts show strong cosmic evolutionin comoving number density, the fraction of such galaxies hosting active nucleiand the comoving X-ray energy density. The integrated X-ray luminosity functionis used to estimate the amount of the accreted black hole mass in these AGNsand places a strong lower limit of 12% to the fraction of local low-massgalaxies hosting black holes, though a more likely value is probably muchhigher (> 50%) once the heavily-obscured objects missed in current X-raysurveys are accounted for.

BH Accretion in Low-Mass Galaxies Since z~1