Radio signatures of a massive black hole in GHZ9 at z ∼ 10

Muhammad A. Latif, Daniel J. Whalen

Research output: Contribution to journalArticlepeer-review

Abstract

Synergies between the JWST and the Chandra X-ray observatory have advanced the observational frontier by detecting a handful of active galactic nuclei beyond z ∼ 10. In particular, the recent discovery of a candidate 8 × 107M black hole (BH) in the galaxy GHZ9 at z = 10.4 favours massive seed formation channels for these objects. Motivated by prospects for their detection in radio by recent studies, we estimate radio fluxes for GHZ9 and explore the possibility of their detection with the Square Kilometer Array (SKA) and next-generation Very Large Array (ngVLA). We find that ngVLA should be able to detect radio emission from GHZ9 for integration times as short as 1 h, while SKA will require integration times of up to 100 h. We also find that radio emission from the BH can be distinguished from that due to H II regions and supernovae in its host galaxy. The detection of a few hundred nJy radio signal at frequencies >2 GHz will be a smoking gun for the presence of a BH in GHZ9.

Original languageEnglish
Pages (from-to)3448-3452
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Volume537
Issue number4
DOIs
Publication statusPublished - Mar 1 2025

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint

Dive into the research topics of 'Radio signatures of a massive black hole in GHZ9 at z ∼ 10'. Together they form a unique fingerprint.

Cite this