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With the black hole mass function (BHMF; assuming an exponential cutoff at amass of $\sim 40\,M_\odot$) of coalescing binary black hole systems constructedwith the events detected in the O1 run of the advanced LIGO/Virgo network,Liang et al.(2017) predicted that the birth of the lightest intermediate massblack holes (LIMBHs; with a final mass of $\gtrsim 100\,M_\odot$) is verylikely to be caught by the advanced LIGO/Virgo detectors in their O3 run. TheO1 and O2 observation run data, however, strongly favor a cutoff of the BHMFmuch sharper than the exponential one. In this work we show that a power-lawfunction followed by a sudden drop at $\sim 40\,M_\odot$ by a factor of $\sim$a few tens and then a new power-law component extending to $\geq 100M_\odot$are consistent with the O1 and O2 observation run data. With this new BHMF,quite a few LIMBH events can be detected in the O3 observation run of advancedLIGO/Virgo. The first LIMBH born in GW190521, an event detected in the earlystage of the O3 run of advanced LIGO/Virgo network, provides additionalmotivation for our hypothesis.

GW190521 and the GWTC-1 Events: Implication on the Black Hole Mass Function of Coalescing Binary Black Hole Systems