Journal article
A geostatistical analysis of multiscale metallicity variations in galaxies - II. Predicting the metallicities of H ii and diffuse ionized gas regions via universal kriging
B Metha, M Trenti, T Chu, A Battisti
Monthly Notices of the Royal Astronomical Society | Published : 2022
Abstract
The metallicity of diffuse ionized gas (DIG) cannot be determined using strong emission line diagnostics, which are calibrated to calculate the metallicity of H ii regions. Because of this, resolved metallicity maps from integral field spectroscopy (IFS) data remain largely incomplete. In this paper (the second of a series), we introduce the geostatistical technique of universal kriging, which allows the complete 2D metallicity distribution of a galaxy to be reconstructed from metallicities measured at H ii regions, accounting for spatial correlations between nearby data points. We apply this method to construct high-fidelity metallicity maps of the local spiral galaxy NGC 5236 using data fr..
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Grants
Awarded by Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
Funding Acknowledgements
The authors thank the anonymous referee for their comments, which helped improve the structure and readability of this paper. We would like to give thanks to Prof. Barry F. Madore (Carnegie Observatories and the University of Chicago) PI of the TYPHOON Programme, to members of that team, especially Dr. Henry Poetrodjojo, Prof. Lisa Kewley, Dr. Mark Seibert, and Dr. Jeff Rich for providing the data and numerous insights; to Dr Alex Cameron for his expertise on BPT diagnostics; and to Dr. Nicha Leethochawalit for their helpful comments in preparing this manuscript. BM acknowledges support from an Australian Government Research Training Program (RTP) Scholarship. This research is supported in part by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013.