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 present pure spectroscopic constraints on the UV luminosity functions andcosmic star formation rate (SFR) densities from 25 galaxies at$z_\mathrm{spec}=8.61-13.20$. By reducing the JWST/NIRSpec spectra taken inmultiple programs of ERO, ERS, GO, and DDT with our analysis technique, weindependently confirm 16 galaxies at $z_\mathrm{spec}=8.61-11.40$ including newredshift determinations, and a bright interloper at $z_\mathrm{spec}=4.91$ thatwas claimed as a photometric candidate at z~16. In conjunction with ninegalaxies at redshifts up to $z_\mathrm{spec}=13.20$ in the literature, we makea sample of 25 spectroscopically-confirmed galaxies in total and carefullyderive the best estimates and lower limits of the UV luminosity functions.These UV luminosity function constraints are consistent with the previousphotometric estimates within the uncertainties and indicate mild redshiftevolution towards z~12 showing tensions with some theoretical models of rapidevolution. With these spectroscopic constraints, we obtain firm lower limits ofthe cosmic SFR densities and spectroscopically confirm a high SFR density atz~12 beyond the constant star-formation efficiency models, which supportsearlier claims from the photometric studies. While there are nospectroscopically-confirmed galaxies with very large stellar masses violatingthe $\Lambda$CDM model due to the removal of the bright interloper, we confirmstar-forming galaxies at $z_\mathrm{spec}=11-13$ with stellar masses muchhigher than model predictions. Our results indicate possibilities of highstar-formation efficiency (>5%), hidden AGN, top-heavy initial mass function(possibly with Pop-III), and large scatter/variance. Having these successfuland unsuccessful spectroscopy results, we suggest observational strategies forefficiently removing low redshift interlopers for future JWST programs.

Pure Spectroscopic Constraints on UV Luminosity Functions and Cosmic  Star Formation History From 25 Galaxies at $z_\mathrm{spec}=8.61-13.20$  Confirmed with JWST/NIRSpec