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Using a new, high-resolution cosmological hydrodynamic simulation of a MilkyWay-type (MW-type) galaxy, we explore how a merger-rich assembly historyaffects the mass budget of the central supermassive black hole (SMBH). Weexamine a MW-mass halo at the present epoch whose evolution is characterized byseveral major mergers to isolate the importance of merger history on black holeaccretion. This study is an extension of Bellovary et. al. 2013, which analyzedthe accretion of high mass, high redshift galaxies and their central blackholes, and found that the gas content of the central black hole reflects whatis accreted by the host galaxy halo. In this study, we find that a merger-richgalaxy will have a central SMBH preferentially fed by merger gas. Moreover, wefind that nearly 30$\%$ of the accreted mass budget of the SMBH enters thegalaxy through the two major mergers in its history, which may account for theincrease of merger-gas fueling the SMBH. Through an investigation of theangular momentum of the gas entering the host and its SMBH, we determine thatmerger gas enters the galaxy with lower angular momentum compared to smoothaccretion, partially accounting for the preferential fueling witnessed in theSMBH. In addition, the presence of mergers, particularly major mergers, alsohelps funnel low angular momentum gas more readily to the center of the galaxy.Our results imply that galaxy mergers play an important role in feeding theSMBH in MW-type galaxies with merger-rich histories. Our results imply thatgalaxy mergers play an important role in feeding the SMBH in MW-type galaxieswith merger-rich histories.

Cosmological Hydrodynamic Simulations of Preferential Accretion in the SMBH of Milky Way Size Galaxies