English

Radio Emission From a $z =$ 10.1 Black Hole in UHZ1

Astrophysics of Galaxies 2023-09-12 v2

Abstract

The recent discovery of a 4 ×\times 107^7 M_{\odot} black hole (BH) in UHZ1 at z=z = 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 zz \sim 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 zz \sim 5 - 15 quasar astronomy in the coming decade.

Keywords

Cite

@article{arxiv.2308.03837,
  title  = {Radio Emission From a $z =$ 10.1 Black Hole in UHZ1},
  author = {Daniel J. Whalen and Muhammad A. Latif and Mar Mezcua},
  journal= {arXiv preprint arXiv:2308.03837},
  year   = {2023}
}

Comments

5 pages, 2 figures, accepted by ApJ