Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 510, Issue 2, Pages 1880-1893Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab3506
Keywords
methods: numerical; H II regions; galaxies: formation
Categories
Funding
- Science and Technology Facilities Council [ST/P000244/I]
- Atraccion de Talento - Comunidad de Madrid in Spain [2019T1/TIC-12702]
- BEIS capital funding via STEC capital grants [ST/K00042X/1, ST/P002293/1, ST/R002371/1, ST/S002502/1]
- Durham University
- STEC operations grant [ST/R000832/1]
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A new model is introduced to compute the luminosity of emission lines in star-forming galaxies, which is successfully applied in the semi-analytical galaxy formation code GALFORM. The model combines pre-computed grid of H II region models with empirical determination of H II regions properties dependence on macroscopic properties of galaxies. The new model accurately reproduces the locus of star-forming galaxies on standard line ratio diagnostic diagrams and shows evolution with redshift.
We present a new model to compute the luminosity of emission lines in star-forming galaxies and apply this in the semi-analytical galaxy formation code GALFORM. The model combines a pre-computed grid of H II region models with an empirical determination of how the properties of H II regions depend on the macroscopic properties of galaxies based on observations of local galaxies. The new model gives a very good reproduction of the locus of star-forming galaxies on standard line ratio diagnostic diagrams. The new model shows evolution in the locus of star-forming galaxies with redshift on this line ratio diagram, with a good match to the observed line ratios at z = 1.6. The model galaxies at high redshift have gas densities and ionisation parameters that are predicted to be approximate to 2-3 times higher than in local star-forming galaxies, which is partly driven by the changing selection with redshift to mimic the observational selection. Our results suggest that the observed evolution in emission line ratios requires other H II region properties to evolve with redshift, such as the gas density, and cannot be reproduced by H II model grids that only allow the gas metallicity and ionisation parameter to vary.
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