English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Nearly 300 quasars have now been found at $z >$ 6, including nine at $z >$ 7.They are thought to form from the collapse of supermassive primordial stars to10$^4$ - 10$^5$ M$_{\odot}$ black holes at $z \sim$ 20 - 25, which then rapidlygrow in the low-shear environments of rare, massive halos fed by strongaccretion flows. Sensitive new radio telescopes such as the Next-GenerationVery Large Array (ngVLA) and the Square Kilometer Array (SKA) could probe theevolution of these objects at much earlier times. Here, we estimate radio fluxfrom the first quasars at $z \sim$ 6 - 15 at 0.5 - 12.5 GHz. We find that SKAand ngVLA could detect a quasar like ULAS J1120+0641, a 1.35 $\times$ 10$^9$M$_{\odot}$ black hole at $z =$ 7.1, at much earlier stages of evolution, $z\sim$ 14 - 15, with 100 hr integration times in targeted searches. The adventof these new observatories, together with the James Webb Space Telescope(JWST), Euclid, and the Roman Space Telescope (RST), will inaugurate the era of$z \lesssim$ 15 quasar astronomy in the coming decade.

Radio Emission from the First Quasars at $z \sim$ 6-15