The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients
ABSTRACT We measure the gas-phase metallicity gradients of 248 galaxies selected from Data Release 2 of the SAMI Galaxy Survey. We demonstrate that there are large systematic discrepancies between the metallicity gradients derived using common strong emission line metallicity diagnostics. We determi...
Published in: | Monthly Notices of the Royal Astronomical Society |
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2021
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Online Access: | http://dx.doi.org/10.1093/mnras/stab205 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stab205/36150192/stab205.pdf http://academic.oup.com/mnras/article-pdf/502/3/3357/36296989/stab205.pdf |
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croxfordunivpr:10.1093/mnras/stab205 2024-05-19T07:48:00+00:00 The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients Poetrodjojo, Henry Groves, Brent Kewley, Lisa J Sweet, Sarah M Sanchez, Sebastian F Medling, Anne M López-Sánchez, Ángel R Brough, Sarah Cortese, Luca van de Sande, Jesse Vaughan, Sam Richards, Samuel N Bryant, Julia J Croom, Scott M Bland-Hawthorn, Joss Goodwin, Michael Lawrence, Jon S Owers, Matt S Scott, Nicholas Australian Research Council 2021 http://dx.doi.org/10.1093/mnras/stab205 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stab205/36150192/stab205.pdf http://academic.oup.com/mnras/article-pdf/502/3/3357/36296989/stab205.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Monthly Notices of the Royal Astronomical Society volume 502, issue 3, page 3357-3373 ISSN 0035-8711 1365-2966 journal-article 2021 croxfordunivpr https://doi.org/10.1093/mnras/stab205 2024-04-25T07:57:58Z ABSTRACT We measure the gas-phase metallicity gradients of 248 galaxies selected from Data Release 2 of the SAMI Galaxy Survey. We demonstrate that there are large systematic discrepancies between the metallicity gradients derived using common strong emission line metallicity diagnostics. We determine which pairs of diagnostics have Spearman’s rank coefficients greater than 0.6 and provide linear conversions to allow the accurate comparison of metallicity gradients derived using different strong emission line diagnostics. For galaxies within the mass range 8.5 < log (M/M⊙) < 11.0, we find discrepancies of up to 0.11 dex/Re between seven popular diagnostics in the metallicity gradient–mass relation. We find a suggestion of a break in the metallicity gradient–mass relation, where the slope shifts from negative to positive, occurs between 9.5 < log (M/M⊙) < 10.5 for the seven chosen diagnostics. Applying our conversions to the metallicity gradient–mass relation, we reduce the maximum dispersion from 0.11 dex/Re to 0.02 dex/Re. These conversions provide the most accurate method of converting metallicity gradients when key emission lines are unavailable. We find that diagnostics that share common sets of emission line ratios agree best, and that diagnostics calibrated through the electron temperature provide more consistent results compared to those calibrated through photoionization models. Article in Journal/Newspaper sami Oxford University Press Monthly Notices of the Royal Astronomical Society 502 3 3357 3373 |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
ABSTRACT We measure the gas-phase metallicity gradients of 248 galaxies selected from Data Release 2 of the SAMI Galaxy Survey. We demonstrate that there are large systematic discrepancies between the metallicity gradients derived using common strong emission line metallicity diagnostics. We determine which pairs of diagnostics have Spearman’s rank coefficients greater than 0.6 and provide linear conversions to allow the accurate comparison of metallicity gradients derived using different strong emission line diagnostics. For galaxies within the mass range 8.5 < log (M/M⊙) < 11.0, we find discrepancies of up to 0.11 dex/Re between seven popular diagnostics in the metallicity gradient–mass relation. We find a suggestion of a break in the metallicity gradient–mass relation, where the slope shifts from negative to positive, occurs between 9.5 < log (M/M⊙) < 10.5 for the seven chosen diagnostics. Applying our conversions to the metallicity gradient–mass relation, we reduce the maximum dispersion from 0.11 dex/Re to 0.02 dex/Re. These conversions provide the most accurate method of converting metallicity gradients when key emission lines are unavailable. We find that diagnostics that share common sets of emission line ratios agree best, and that diagnostics calibrated through the electron temperature provide more consistent results compared to those calibrated through photoionization models. |
author2 |
Australian Research Council |
format |
Article in Journal/Newspaper |
author |
Poetrodjojo, Henry Groves, Brent Kewley, Lisa J Sweet, Sarah M Sanchez, Sebastian F Medling, Anne M López-Sánchez, Ángel R Brough, Sarah Cortese, Luca van de Sande, Jesse Vaughan, Sam Richards, Samuel N Bryant, Julia J Croom, Scott M Bland-Hawthorn, Joss Goodwin, Michael Lawrence, Jon S Owers, Matt S Scott, Nicholas |
spellingShingle |
Poetrodjojo, Henry Groves, Brent Kewley, Lisa J Sweet, Sarah M Sanchez, Sebastian F Medling, Anne M López-Sánchez, Ángel R Brough, Sarah Cortese, Luca van de Sande, Jesse Vaughan, Sam Richards, Samuel N Bryant, Julia J Croom, Scott M Bland-Hawthorn, Joss Goodwin, Michael Lawrence, Jon S Owers, Matt S Scott, Nicholas The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients |
author_facet |
Poetrodjojo, Henry Groves, Brent Kewley, Lisa J Sweet, Sarah M Sanchez, Sebastian F Medling, Anne M López-Sánchez, Ángel R Brough, Sarah Cortese, Luca van de Sande, Jesse Vaughan, Sam Richards, Samuel N Bryant, Julia J Croom, Scott M Bland-Hawthorn, Joss Goodwin, Michael Lawrence, Jon S Owers, Matt S Scott, Nicholas |
author_sort |
Poetrodjojo, Henry |
title |
The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients |
title_short |
The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients |
title_full |
The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients |
title_fullStr |
The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients |
title_full_unstemmed |
The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients |
title_sort |
sami galaxy survey: reconciling strong emission line metallicity diagnostics using metallicity gradients |
publisher |
Oxford University Press (OUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1093/mnras/stab205 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stab205/36150192/stab205.pdf http://academic.oup.com/mnras/article-pdf/502/3/3357/36296989/stab205.pdf |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society volume 502, issue 3, page 3357-3373 ISSN 0035-8711 1365-2966 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/mnras/stab205 |
container_title |
Monthly Notices of the Royal Astronomical Society |
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502 |
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3 |
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3357 |
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3373 |
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1799488494363475968 |