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

JWST is revolutionizing our understanding of the high-$z$ Universe byexpanding the black hole horizon, looking farther and to smaller masses, andrevealing the stellar light of their hosts. By examining JWST galaxies at$z=4-7$ that host H$\alpha$-detected black holes, we investigate (i) thehigh-$z$ $M_\bullet-M_\star$ relation and (ii) the black hole massdistribution, especially in its low-mass range ($M_\bullet \lesssim 10^{6.5}M_\odot$). With a detailed statistical analysis, our findings conclusivelyreveal a high-$z$ $M_\bullet-M_\star$ relation that deviates at $>3\sigma$confidence level from the local relation. The high-$z$ relation is:$\log(M_\bullet/M_\odot) = -2.43^{+0.83}_{-0.83} + 1.06^{+0.09}_{-0.09}\log(M_\star/M_\odot)$. Black holes are overmassive by $\sim 10-100\times$compared to their low-$z$ counterparts in galactic hosts of the same stellarmass. This fact is not due to a selection effect in surveys. Moreover, ouranalysis predicts the possibility of detecting in high-$z$ JWST surveys$5-15\times$ more black holes with $M_\bullet \lesssim 10^{6.5} M_\odot$, and$10-30\times$ more with $M_\bullet \lesssim 10^{8.5} M_\odot$, compared tolocal relation's predictions. The lighter black holes preferentially occupygalaxies with a stellar mass of $\sim 10^{7.5}-10^8 M_\odot$. We have yet todetect these sources because (i) they may be inactive (duty cycles $1\%-10\%$),(ii) the host overshines the AGN, or (iii) the AGN is obscured and notimmediately recognizable by line diagnostics. A search of low-mass black holesin existing JWST surveys will further test the $M_\bullet-M_\star$ relation.Current JWST fields represent a treasure trove of black hole systems at $z =4-7$; their detection will provide crucial insights into their early evolutionand co-evolution with their galactic hosts.

the astrophysical journal. letters

JWST CEERS & JADES Active Galaxies at z = 4-7 Violate the Local  $M_\bullet-M_\star$ Relation at $>3\sigma$: Implications for Low-Mass Black  Holes and Seeding Models