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

The James Webb Space Telescope is now detecting early black holes (BHs) asthey transition from "seeds" to supermassive BHs. Recently Bogdan et al. (2023)reported the detection of an X-ray luminous supermassive BH, UHZ-1, with aphotometric redshift at $z > 10$. Such an extreme source at this very highredshift provides new insights on seeding and growth models for BHs given theshort time available for formation and growth. Harnessing the exquisitesensitivity of JWST/NIRSpec, here we report the spectroscopic confirmation ofUHZ-1 at $z = 10.073 \pm 0.002$. We find that the NIRSpec/Prism spectrum istypical of recently discovered z~10 galaxies, characterized primarily bystar-formation features. We see no clear evidence of the powerful X-ray sourcein the rest-frame UV/optical spectrum, which may suggest heavy obscuration ofthe central BH, in line with the Compton-thick column density measured in theX-rays. We perform a stellar population fit simultaneously to the new NIRSpecspectroscopy and previously available photometry. The fit yields a stellar massestimate for the host galaxy that is significantly better constrained thanprior photometric estimates ($M_*\sim 1.4^{+0.3}_{-0.4} \times 10^8 M_\odot$).Given the predicted BH mass ($M_{\rm BH}\sim10^7-10^8 M_\odot$), the resultingratio of $M_{\rm BH}/M_*$ remains two to three orders of magnitude higher thanlocal values, thus lending support to the heavy seeding channel for theformation of supermassive BHs within the first billion years of cosmicevolution.

UNCOVER: The growth of the first massive black holes from JWST/NIRSpec -- spectroscopic redshift confirmation of an X-ray luminous AGN at z=10.1