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

The distribution of N/O abundance ratios calculated by the detailed modellingof different galaxy spectra at z<4 is investigated. Supernova (SN) and longgamma-ray-burst (LGRB) host galaxies cover different redshift domains. N/O inSN hosts increases due to secondary N production towards low z (0.01)accompanying the growing trend of active galaxies (AGN, LINER). N/O in LGRBhosts decreases rapidly between z>1 and z ~0.1 following the N/H trend andreach the characteristic N/O ratios calculated for the HII regions in local andnearby galaxies. The few short period GRB (SGRB) hosts included in the galaxysample show N/H <0.04 solar and O/H solar. They seem to continue the low boundN/H trend of SN hosts at z<0.3. The distribution of N/O as function ofmetallicity for SN and LGRB hosts is compared with star chemical evolutionmodels. The results show that several LGRB hosts can be explained by starmulti-bursting models when 12+log(O/H) <8.5, while some objects follow thetrend of continuous star formation models. N/O in SN hosts at log(O/H)+12 <8.5are not well explained by stellar chemical evolution models calculated forstarburst galaxies. At 12+log(O/H) >8.5 many different objects are nested closeto O/H solar with N/O ranging between the maximum corresponding to starburstgalaxies and AGN and the minimum corresponding to HII regions and SGRB.

N/O abundance ratios in gamma-ray burst and supernova host galaxies at z<4. Comparison with AGN, starburst and HII regions