Given that how common it is to find massive stars in multiple systems, it would be surprising not to find systems of compact massive objects that are remnants o

Given that how common it is to find massive stars in multiple systems, it would be surprising not to find systems of compact massive objects that are remnants of these. OTOH, who knows about intermediate mass BHs and beyond. Aggregation of these multiple systems of CMOs? Let's look! - -- sec 3.5 and table 1, Duchêne & Kraus, https://arxiv.org/abs/1303.3028 https://arxiv.org/abs/1303.3028 multiplicity counts are all over the map: Eggleton & Tokovinin 2008 Guerrero et al. 2014 Lada 2006 but pretty much nobody thinks they're extremely rare.