Beyond the far side: Observing black hole mergers beyond the pair-instability mass gap with next-generation gravitational wave detectors
arxiv(2024)
摘要
Stellar evolution predicts the existence of a mass gap for black hole
remnants produced by pair-instability supernova dynamics, whose lower and upper
edges are very uncertain. We study the possibility of constraining the location
of the upper end of the pair-instability mass gap, which is believed to appear
around m_min∼130M_⊙, using gravitational wave observations
of compact binary mergers with next-generation ground-based detectors. While
high metallicity may not allow for the formation of first-generation black
holes on the "far side" beyond the gap, metal-poor environments containing
Population III stars could lead to such heavy black hole mergers. We show that,
even in the presence of contamination from other merger channels,
next-generation detectors will measure the location of the upper end of the
mass gap with a relative precision close to Δm_min/m_min≃ 4% (N_det/100 )^-1/2 at 90
C.L., where N_det is the number of detected mergers with both members
beyond the gap. These future observations could reduce current uncertainties in
nuclear and astrophysical processes controlling the location of the gap.
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