Radio emission from a z = 10.1 black hole in UHZ1

Daniel Whalen, M. A. Latif, Mar Mezcua

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The recent discovery of a 4 × 107 M⊙ black hole (BH) in UHZ1 at = 10.3, just 450 Myr after the big bang, suggests that the seeds of the first quasars may have been direct-collapse black holes (DCBHs) from the collapse of supermassive primordial stars at ∼ 20. This object was identified in James Webb Space Telescope (JWST) NIRcam and Chandra X-ray data, but recent studies suggest that radio emission from such a BH should also be visible to the Square Kilometer Array (SKA) and the next-generation Very Large Array (ngVLA). Here, we present estimates of radio flux densities for UHZ1 from 0.1 - 10 GHz, and find that SKA and ngVLA could detect it with integration times of 10 - 100 hr and just 1 - 10 hr, respectively. It may be possible to see this object with VLA now with longer integration times. The detection of radio emission from UHZ1 would be a first test of exciting new synergies between near infrared (NIR) and radio observatories that could open the era of z∼ 5 - 15 quasar astronomy in the coming decade.
Original languageEnglish
Article number133
Number of pages4
JournalThe Astrophysical Journal
Issue number2
Early online date17 Oct 2023
Publication statusPublished - 20 Oct 2023


  • quasars: supermassive black holes
  • black hole physics
  • early universe
  • dark ages, reionization, first stars
  • galaxies: formation
  • galaxies: high-redshift

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