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Abstract

In the coming years, third-generation detectors such as the Einstein
Telescope and the Cosmic Explorer will enter the network of ground-based
gravitational-wave detectors. Their current design predicts a significantly
improved sensitivity band with a lower minimum frequency than existing
detectors. This, combined with the increased arm length, leads to two major
effects: the detection of more signals and the detection of longer signals.
Both will result in a large number of overlapping signals.
It has been shown that such overlapping signals can lead to biases in the
recovered parameters, which would adversely affect the science extracted from
the observed binary merger signals. In this work, we analyze overlapping binary
black hole coalescences with two methods to analyze multi-signal observations:
hierarchical subtraction and joint parameter estimation. We find that these
methods enable a reliable parameter extraction in most cases and that joint
parameter estimation is usually more precise but comes with higher
computational costs.