Abundance of LIGO/Virgo Black Holes from Microlensing Observations of Quasars with Reverberation Mapping Size Estimates
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A. Esteban-Gutiérrez... [et al.], 2022 ApJ 929 123. [https://doi.org/10.3847/1538-4357/ac57c5]
SponsorshipSpanish Ministry of Economy and Competitiveness (MINECO) - MCIN/AEI AYA2016-79104-C3-1-P AYA2016-79104-C3-3-P PID2020-118687GB-C33 PID2020-118687GB-C32 PID2020-118687GB-C31; Spanish Government AYA2017-84897-P SEV-2015-0548-17-4 BES-2017-082319; European Commission; Spanish Government AYA2017-84897-P; Junta de Andalucia FQM-108 P20_00334 A-FQM-510-UGR20/FEDER
Assuming a population of black holes (BHs) with masses in the range inferred by LIGO/Virgo from BH mergers, we use quasar microlensing observations to estimate their abundances. We consider a mixed population of stars and BHs and the presence of a smooth dark matter component. We adopt reverberation mapping estimates of the quasar size. According to a Bayesian analysis of the measured microlensing magnifications, a population of BHs with masses similar to 30M (circle dot) constitutes less than 0.4% of the total matter at the 68% confidence level (less than 0.9% at the 90% confidence level). We have explored the whole mass range of LIGO/Virgo BHs, finding that this upper limit ranges from 0.5% to 0.4% at the 68% confidence level (from 1.1% to 0.9% at the 90% confidence level) when the BH masses change from 10 to 60M (circle dot). We estimate a 16% contribution from the stars, in agreement with previous studies based on a single-mass population that do not explicitly consider the presence of BHs. These results are consistent with the estimates of BH abundances from the statistics of LIGO/Virgo mergers, and rule out primordial BHs (or any other types of compact object) in this mass range constituting a significant fraction of the dark matter.