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Abstract The local black hole mass function (BHMF) is of great interest to a variety of astrophysical problems, ranging from black hole binary merger rates to an indirect census of the dominant seeding mechanism of supermassive black holes. In this Letter, we combine the latest galaxy stellar mass function from the Galaxy And Mass Assembly survey with X-ray-based constraints to the local black hole occupation fraction to probe the BHMF below 10 6 M ⊙ . Notwithstanding the large uncertainties inherent to the choice of a reliable observational proxy for black hole mass, the resulting range of BHMFs yields a combined normalization uncertainty of ≲1 dex over the 10 5 –10 6 M ⊙ range, where upcoming, space-based gravitational wave detectors are designed to be most sensitive.
Gallo et al. (2019) studied this question.