GHZ9's candidate black hole should emit radio fluxes of roughly 0.1 to 4.5 microjansky at 0.1 to 10 GHz, detectable by ngVLA in about one hour and by SKA in up to 100 hours.
Science with an ngVLA: Local Constraints on Supermassive Black Hole Seeds
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abstract
Determining the mechanisms that formed and grew the first supermassive black holes is one of top priorities in extragalactic astrophysics. Observational clues can be inferred from the demographics of massive black holes (in the ten thousand through million Solar mass range) in nearby low-mass galaxies. This chapter of the next generation Very Large Array (ngVLA) Science Book describes how an ngVLA can play a prominent role in developing large samples of weakly accreting active galactic nuclei in low-mass galaxies (out to nearly 1 Gpc), which will help constrain the types of objects that originally seeded the growth of supermassive black holes.
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Radio Signatures of a Massive Black Hole in GHZ9 at z $\sim$ 10
GHZ9's candidate black hole should emit radio fluxes of roughly 0.1 to 4.5 microjansky at 0.1 to 10 GHz, detectable by ngVLA in about one hour and by SKA in up to 100 hours.