The role of the diffuse ionized gas in metallicity calibrations

N. Vale Asari

The role of the diffuse ionized gas in metallicity calibrations

Astrophysics of Galaxies 2021-08-03 v1

Authors: N. Vale Asari

Abstract

Estimates of gas-phase abundances based on strong-line methods have been calibrated for H~{\scshape ii} regions. Those methods ignore any contribution from the diffuse ionized gas (DIG), which shows enhanced collisional-to-recombination line ratios in comparison to H~{\scshape ii} regions of the same metallicity. Applying strong line methods whilst ignoring the role of the DIG thus systematically overestimates metallicities. Using integral field spectroscopy data, we show how to correct for the DIG contribution and how it biases the mass--metallicity--star formation rate relation.

Keywords

diffuse ionized gas metallicity calibration strong-line method h ii regions mass-metallicity-sfr relation

Cite

@article{arxiv.2108.00076,
  title  = {The role of the diffuse ionized gas in metallicity calibrations},
  author = {N. Vale Asari},
  journal= {arXiv preprint arXiv:2108.00076},
  year   = {2021}
}

Comments

6 pages, 4 figures, Proceedings of Chemical Abundances in Gaseous Nebulae: from the Milky Way to the early Universe, M. Cardaci & G. H\"agele, eds

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