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

We report the discovery of four galaxy candidates observed 450 - 600 Myrafter the Big Bang with photometric redshifts between z ~ 8.3 - 10.2 measuredusing the JWST NIRCam imaging of the galaxy cluster WHL0137-08 observed in 8filters spanning 0.8-5.0 micron, plus 9 Hubble filters spanning 0.4-1.7 micron.One candidate is gravitationally lensed with a magnification of ~8, while theother three are located in a nearby NIRCam module with expected magnificationsof <~ 1.1. Using SED fitting, we estimate the stellar masses of these galaxiesare typically in the range log M*/Msun = 8.3 - 8.7. All appear young withmass-weighted ages < 240 Myr, low dust content A_V < 0.15 mag, and specificstar formation rates sSFR ~0.25 - 10 /Gyr for most. One z ~ 9 candidate isconsistent with an age < 5 Myr and a sSFR ~10 /Gyr, as inferred from a strongF444W excess, implying [OIII]+H-beta rest-frame equivalent width ~2000Angstrom, although an older z ~ 10 object is also allowed. Another z ~ 9candidate is lensed into an arc 2.4 arcsec long with a magnification of ~8.This arc is the most spatially-resolved galaxy at z ~ 9 known to date,revealing structures ~30 pc across. Follow-up spectroscopy of WHL0137-08 withJWST/NIRSpec will be useful to spectroscopically confirm these high-redshiftgalaxy candidates and to study their physical properties in more detail.

High-Redshift Galaxy Candidates at $z = 9-10$ as Revealed by JWST Observations of WHL0137-08