From the single Icarus event, the authors exclude primordial black hole fractions above about 20% of dark matter for masses 0.1-10 solar masses.
The apparent magnitude of the arc is 25 magarcsec −2 in the F125W band, which corresponds to the luminosity den- sity 6.5×109 L⊙arcsec−2
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Constraints on primordial black holes from the observed number of Icarus-like ultrahigh magnification events
From the single Icarus event, the authors exclude primordial black hole fractions above about 20% of dark matter for masses 0.1-10 solar masses.