Prospects of Identifying Hierarchical Triple Mergers for the Third-generation Ground-based Detectors
The Astrophysical Journal(2024)
摘要
A hierarchical triple merger (HTM) constitutes a type of event in which two
successive black hole (BH) mergers occur sequentially within the observational
window of gravitational wave (GW) detectors, which has important role in
testing general relativity and studying BH population. In this work, we conduct
an analysis to determine the feasibility of identifying HTMs from a large GW
event catalog using the third-generation ground-based GW detectors. By
comparing the Bhattacharyya coefficient that measures the overlap between the
posterior distributions of the remnant and progenitor BH parameters, we find
that the overlap between the event pair can serve as a preliminary filter,
which balances between computational demand and the probability of false
alarms. Following this initial, time-efficient, yet less accurate screening, a
subset of potential HTM candidates will be retained. These candidates will
subsequently be subjected to a more precise, albeit time-intensive, method of
joint parameter estimation for verification. Ultimately, this process will
enable us to robustly identify HTMs.
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关键词
Compact objects,Gravitational wave sources
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