A Moon-based radio array with roughly SKA-like collecting area could detect enough high-redshift radio-loud quasars at z≈10 to enable 21-cm forest studies, while smaller arrays reach only z≈5-6.
We assume that 10% of quasars are radio-loud [accord- ing to observational experience, e.g
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Configuration Requirements for 21-cm Forest Background Quasar Searches with the Moon-based Interferometer
A Moon-based radio array with roughly SKA-like collecting area could detect enough high-redshift radio-loud quasars at z≈10 to enable 21-cm forest studies, while smaller arrays reach only z≈5-6.