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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

JWST has detected many overmassive galactic systems at $z > 4$, where themass of the black hole, $M_\bullet$, is $10-100$ times larger than expectedfrom local relations, given the host's stellar mass, $M_\star$. This Letterpresents a model to describe these overmassive systems in the high-$z$Universe. We suggest that the black hole mass is the main driver of high-$z$star formation quenching. SMBHs globally impact their high-$z$ galaxies becausetheir hosts are physically small, and the black holes have duty cycles close tounity at $z > 4$. In this regime, we assume that black hole mass growth isregulated by the quasar's output, while stellar mass growth is quenched by itand uncorrelated to the global properties of the host halo. We find that theratio $M_\bullet/M_\star$ controls the average star formation efficiency: if$M_\bullet/M_\star > 8\times 10^{18} (n \Lambda/f_{edd})[(\Omega_bM_h)/(\Omega_m M_\star) - 1]$, then the galaxy is unable to form starsefficiently. Once this ratio exceeds the threshold, a runaway process bringsthe originally overmassive system towards the local $M_\bullet - M_\star$relation. Furthermore, the $M_\bullet - M_\star$ relation evolves with redshiftas $\propto (1+z)^{5/2}$. At $z \sim 5$, we find an overmassive factor of $\sim55$, in excellent agreement with current JWST data and the high-$z$ relationinferred from those. Extending the black hole horizon farther in redshift andlower in mass will test this model and improve our understanding of the earlyco-evolution of black holes and galaxies.

The Redshift Evolution of the $M_\bullet-M_\star$ Relation for JWST's Supermassive Black Holes at $z > 4$