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

Little is known about the mass-metallicity relation (MZR) in galaxies atcosmic dawn. Studying the first appearance of the MZR is one of the keys tounderstanding the formation and evolution of the first galaxies. In order tolay the groundwork for upcoming observational campaigns, we analyze 290galaxies in halos spanning Mh = 10^9-10^11 Msun selected from the FirstLight(FL) cosmological zoom simulations to predict the MZR at z=5-8. Over thisinterval, the metallicity of FL galaxies with stellar mass Ms= 10^8 Msundeclines by < 0.2 dex. This contrasts with the observed tendency formetallicities to increase at lower redshifts, and reflects weakly-evolving oreven increasing gas fractions. We assess the use of the R3 strong-linediagnostic as a metallicity indicator, finding that it is informative for12+log(O/H) < 8 but saturates to R3=3 at higher metallicities owing to acancellation between enrichment and spectral softening. Nonetheless, campaignswith JWST should be able to detect a clear trend between R3 and stellar massfor Ms > 10^7.5 Msun. We caution that, at fixed metallicity, galaxies withhigher specific star formation show higher R3 owing to their more intenseradiation fields, indicating a potential for selection biases.

Weak Evolution of the Mass-metallicity Relation at Cosmic Dawn in the FirstLight Simulations