The SAMI Galaxy Survey: reconciling strong emission line metallicity diagnostics using metallicity gradients
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 linemetallicity diagnostics. We determine which p...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
2021
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Online Access: | http://hdl.handle.net/1959.3/461288 https://doi.org/10.1093/mnras/stab205 |
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ftswinburne:tle:61491695-4ca1-43dc-b9d8-b39c88443831:28f49f06-0da8-44be-9edc-ad1dd0a9c582:1 2023-05-15T18:11:36+02:00 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. Lopez-Sanchez, Angel 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 Swinburne University of Technology 2021 http://hdl.handle.net/1959.3/461288 https://doi.org/10.1093/mnras/stab205 unknown Oxford University Press (OUP) http://hdl.handle.net/1959.3/461288 https://doi.org/10.1093/mnras/stab205 Copyright © 2021. Monthly Notices of the Royal Astronomical Society, Vol. 502, no. 3 (Apr 2021), pp. 3357-3373 Journal article 2021 ftswinburne https://doi.org/10.1093/mnras/stab205 2021-06-07T22:26:01Z 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 linemetallicity 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-circle dot) < 11.0, we find discrepancies of up to 0.11 dex/R-e 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-circle dot) < 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/R-e to 0.02 dex/R-e. 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 Swinburne University of Technology: Swinburne Research Bank Monthly Notices of the Royal Astronomical Society 502 3 3357 3373 |
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Swinburne University of Technology: Swinburne Research Bank |
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ftswinburne |
language |
unknown |
description |
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 linemetallicity 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-circle dot) < 11.0, we find discrepancies of up to 0.11 dex/R-e 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-circle dot) < 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/R-e to 0.02 dex/R-e. 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 |
Swinburne University of Technology |
format |
Article in Journal/Newspaper |
author |
Poetrodjojo, Henry Groves, Brent Kewley, Lisa J. Sweet, Sarah M. Sanchez, Sebastian F. Medling, Anne M. Lopez-Sanchez, Angel 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. Lopez-Sanchez, Angel 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. Lopez-Sanchez, Angel 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://hdl.handle.net/1959.3/461288 https://doi.org/10.1093/mnras/stab205 |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society, Vol. 502, no. 3 (Apr 2021), pp. 3357-3373 |
op_relation |
http://hdl.handle.net/1959.3/461288 https://doi.org/10.1093/mnras/stab205 |
op_rights |
Copyright © 2021. |
op_doi |
https://doi.org/10.1093/mnras/stab205 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
502 |
container_issue |
3 |
container_start_page |
3357 |
op_container_end_page |
3373 |
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1766184241014505472 |