A novel approach to investigate chemical inhomogeneities in GRB host galaxies: the Z(abs)-Z(emiss) relation
Benjamin Metha, Alex J Cameron, Michele Trenti
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2021
Models of chemical enrichment and inhomogeneity in high-redshift galaxies are challenging to constrain observationally. In this work, we discuss a novel approach to probe chemical inhomogeneities within long gamma-ray burst (GRB) host galaxies, by comparing the absorption metallicity, Zabs, from the GRB afterglow (which probes the environment along the line of sight) with the emission-line metallicity, Zemiss, measured via slit spectroscopy. Using the IllustrisTNG simulation, the theoretical relationship between these metallicity metrics is explored for a range of GRB formation models, varying the GRB progenitor metallicity threshold. For galaxies with fixed Zemiss, the median value of Zabs ..View full abstract
Awarded by Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
We would like to thank Dr Antonino Cucchiara for insightful advice in interpreting absorption-line metallicity measurements and for useful discussions; the IllustrisTNG team formaking their data public and providing lots of documentation and support; and the anonymous referee, whose feedback helped improve and shape this paper. This researchwas supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. BM and AJC acknowledge support from Australian Government Research Training Program (RTP) Scholarships.