Fig. 20.

Detection-weighted distribution of the effective spin parameter of BH-BH mergers for model M40.B with Fuller super-efficient angular momentum transport and fallback decreased BH kicks (no BH kicks for massive BHs). We either do not allow for the efficient tidal spin-up of WR stars that are the most common immediate progenitors of BHs in our models (natal BH spin is calculated directly from MESA stellar models) or we take it into account (natal BH spin is then calculated as described in Sect. 2.5 if the WR star progenitor was subject to an efficient tidal spin-up). For the “no WR tides” approach we find very narrow distribution of effective spins (−0.1 ≲ χeff ≲ 0.1) that is peaked at positive values (average χeff = 0.05). For efficient “WR tides” the distribution is broad (−0.5 ≲ χeff ≲ 1.0) with a peak at χeff ∼ 0.05 (∼78%) and a tail with χeff ≳ 0.25 (22%). For comparison, we show 90% credible limits (blue arrows) and the most likely values (blue stars) of effective spin parameter for ten LIGO/Virgo BH-BH mergers.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.