A PTA's sky-map resolution is capped at multipoles l~ωL, and the pulsar-term information becomes usable for full-sky mapping only with ~10^11 pulsars, far beyond any realistic array.
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Gravitational-Wave Sky Mapping with Pulsar Timing Arrays: The Full Earth-Pulsar Response and Fundamental Resolution Limits
A PTA's sky-map resolution is capped at multipoles l~ωL, and the pulsar-term information becomes usable for full-sky mapping only with ~10^11 pulsars, far beyond any realistic array.