The SAMI galaxy survey: Spatially resolved metallicity and ionization mapping

Henry Poetrodjojo; Brent Groves; Lisa J. Kewley; Anne M. Medling; Sarah M. Sweet; Jesse van de Sande; Sebastian F. Sanchez; Joss Bland-Hawthorn; Sarah Brough; Julia J. Bryant; Luca Cortese; Scott M. Croom; Ángel R. López-Sánchez; Samuel N. Richards; Tayyaba Zafar; Jon S. Lawrence; Nuria P.F. Lorente; Matt S. Owers; Nicholas Scott

doi:10.1093/mnras/sty1782

The SAMI galaxy survey: Spatially resolved metallicity and ionization mapping

Henry Poetrodjojo^*, Brent Groves, Lisa J. Kewley, Anne M. Medling, Sarah M. Sweet, Jesse van de Sande, Sebastian F. Sanchez, Joss Bland-Hawthorn, Sarah Brough, Julia J. Bryant, Luca Cortese, Scott M. Croom, Ángel R. López-Sánchez, Samuel N. Richards, Tayyaba Zafar, Jon S. Lawrence, Nuria P.F. Lorente, Matt S. Owers, Nicholas Scott

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

64 Citations (Scopus)

Abstract

We present gas-phasemetallicity and ionization parameter maps of 25 star-forming face-on spiral galaxies from the SAMI Galaxy Survey Data Release 1. Self-consistent metallicity and ionization parameter maps are calculated simultaneously through an iterative process to account for the interdependence of the strong emission line diagnostics involving ([O II]+[O III])/Hβ (R₂₃) and [O III]/[O II](O32). The maps are created on a spaxel-by-spaxel basis because HII regions are not resolved at the SAMI spatial resolution. We combine the SAMI data with stellar mass, star formation rate (SFR), effective radius (R_e), ellipticity, and position angles (PA) from the GAMA survey to analyse their relation to the metallicity and ionization parameter. We find a weak trend of steepening metallicity gradient with galaxy stellar mass, with values ranging from -0.03 to -0.20 dex/R_e. Only two galaxies show radial gradients in the ionization parameter. We find that the ionization parameter has no significant correlation with either SFR, sSFR (specific SFR), or metallicity. For several individual galaxies, we find the structure in the ionization parameter maps suggestive of spiral arm features. We find a typical ionization parameter range of 7.0 < log (q) < 7.8 for our galaxy sample with no significant overall structure. An ionization parameter range of this magnitude is large enough to caution the use of metallicity diagnostics that have not considered the effects of a varying ionization parameter distribution.

Original language	English
Pages (from-to)	5235-5265
Number of pages	31
Journal	Monthly Notices of the Royal Astronomical Society
Volume	479
Issue number	4
DOIs	https://doi.org/10.1093/mnras/sty1782
Publication status	Published - 1 Oct 2018

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Poetrodjojo, H., Groves, B., Kewley, L. J., Medling, A. M., Sweet, S. M., van de Sande, J., Sanchez, S. F., Bland-Hawthorn, J., Brough, S., Bryant, J. J., Cortese, L., Croom, S. M., López-Sánchez, Á. R., Richards, S. N., Zafar, T., Lawrence, J. S., Lorente, N. P. F., Owers, M. S., & Scott, N. (2018). The SAMI galaxy survey: Spatially resolved metallicity and ionization mapping. Monthly Notices of the Royal Astronomical Society, 479(4), 5235-5265. https://doi.org/10.1093/mnras/sty1782

@article{9e22bef3d3384868a47f3dc8e293cb15,

title = "The SAMI galaxy survey: Spatially resolved metallicity and ionization mapping",

abstract = "We present gas-phasemetallicity and ionization parameter maps of 25 star-forming face-on spiral galaxies from the SAMI Galaxy Survey Data Release 1. Self-consistent metallicity and ionization parameter maps are calculated simultaneously through an iterative process to account for the interdependence of the strong emission line diagnostics involving ([O II]+[O III])/Hβ (R23) and [O III]/[O II](O32). The maps are created on a spaxel-by-spaxel basis because HII regions are not resolved at the SAMI spatial resolution. We combine the SAMI data with stellar mass, star formation rate (SFR), effective radius (Re), ellipticity, and position angles (PA) from the GAMA survey to analyse their relation to the metallicity and ionization parameter. We find a weak trend of steepening metallicity gradient with galaxy stellar mass, with values ranging from -0.03 to -0.20 dex/Re. Only two galaxies show radial gradients in the ionization parameter. We find that the ionization parameter has no significant correlation with either SFR, sSFR (specific SFR), or metallicity. For several individual galaxies, we find the structure in the ionization parameter maps suggestive of spiral arm features. We find a typical ionization parameter range of 7.0 < log (q) < 7.8 for our galaxy sample with no significant overall structure. An ionization parameter range of this magnitude is large enough to caution the use of metallicity diagnostics that have not considered the effects of a varying ionization parameter distribution.",

keywords = "Abundances - galaxies, Galaxies, ISM",

author = "Henry Poetrodjojo and Brent Groves and Kewley, {Lisa J.} and Medling, {Anne M.} and Sweet, {Sarah M.} and {van de Sande}, Jesse and Sanchez, {Sebastian F.} and Joss Bland-Hawthorn and Sarah Brough and Bryant, {Julia J.} and Luca Cortese and Croom, {Scott M.} and L{\'o}pez-S{\'a}nchez, {{\'A}ngel R.} and Richards, {Samuel N.} and Tayyaba Zafar and Lawrence, {Jon S.} and Lorente, {Nuria P.F.} and Owers, {Matt S.} and Nicholas Scott",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s). Published by Oxford University Press on behalf of The Royal Astronomical Society.",

year = "2018",

month = oct,

day = "1",

doi = "10.1093/mnras/sty1782",

language = "English",

volume = "479",

pages = "5235--5265",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

}

Poetrodjojo, H, Groves, B, Kewley, LJ, Medling, AM, Sweet, SM, van de Sande, J, Sanchez, SF, Bland-Hawthorn, J, Brough, S, Bryant, JJ, Cortese, L, Croom, SM, López-Sánchez, ÁR, Richards, SN, Zafar, T, Lawrence, JS, Lorente, NPF, Owers, MS & Scott, N 2018, 'The SAMI galaxy survey: Spatially resolved metallicity and ionization mapping', Monthly Notices of the Royal Astronomical Society, vol. 479, no. 4, pp. 5235-5265. https://doi.org/10.1093/mnras/sty1782

TY - JOUR

T1 - The SAMI galaxy survey

T2 - Spatially resolved metallicity and ionization mapping

AU - Poetrodjojo, Henry

AU - Groves, Brent

AU - Kewley, Lisa J.

AU - Medling, Anne M.

AU - Sweet, Sarah M.

AU - van de Sande, Jesse

AU - Sanchez, Sebastian F.

AU - Bland-Hawthorn, Joss

AU - Brough, Sarah

AU - Bryant, Julia J.

AU - Cortese, Luca

AU - Croom, Scott M.

AU - López-Sánchez, Ángel R.

AU - Richards, Samuel N.

AU - Zafar, Tayyaba

AU - Lawrence, Jon S.

AU - Lorente, Nuria P.F.

AU - Owers, Matt S.

AU - Scott, Nicholas

PY - 2018/10/1

Y1 - 2018/10/1

N2 - We present gas-phasemetallicity and ionization parameter maps of 25 star-forming face-on spiral galaxies from the SAMI Galaxy Survey Data Release 1. Self-consistent metallicity and ionization parameter maps are calculated simultaneously through an iterative process to account for the interdependence of the strong emission line diagnostics involving ([O II]+[O III])/Hβ (R23) and [O III]/[O II](O32). The maps are created on a spaxel-by-spaxel basis because HII regions are not resolved at the SAMI spatial resolution. We combine the SAMI data with stellar mass, star formation rate (SFR), effective radius (Re), ellipticity, and position angles (PA) from the GAMA survey to analyse their relation to the metallicity and ionization parameter. We find a weak trend of steepening metallicity gradient with galaxy stellar mass, with values ranging from -0.03 to -0.20 dex/Re. Only two galaxies show radial gradients in the ionization parameter. We find that the ionization parameter has no significant correlation with either SFR, sSFR (specific SFR), or metallicity. For several individual galaxies, we find the structure in the ionization parameter maps suggestive of spiral arm features. We find a typical ionization parameter range of 7.0 < log (q) < 7.8 for our galaxy sample with no significant overall structure. An ionization parameter range of this magnitude is large enough to caution the use of metallicity diagnostics that have not considered the effects of a varying ionization parameter distribution.

AB - We present gas-phasemetallicity and ionization parameter maps of 25 star-forming face-on spiral galaxies from the SAMI Galaxy Survey Data Release 1. Self-consistent metallicity and ionization parameter maps are calculated simultaneously through an iterative process to account for the interdependence of the strong emission line diagnostics involving ([O II]+[O III])/Hβ (R23) and [O III]/[O II](O32). The maps are created on a spaxel-by-spaxel basis because HII regions are not resolved at the SAMI spatial resolution. We combine the SAMI data with stellar mass, star formation rate (SFR), effective radius (Re), ellipticity, and position angles (PA) from the GAMA survey to analyse their relation to the metallicity and ionization parameter. We find a weak trend of steepening metallicity gradient with galaxy stellar mass, with values ranging from -0.03 to -0.20 dex/Re. Only two galaxies show radial gradients in the ionization parameter. We find that the ionization parameter has no significant correlation with either SFR, sSFR (specific SFR), or metallicity. For several individual galaxies, we find the structure in the ionization parameter maps suggestive of spiral arm features. We find a typical ionization parameter range of 7.0 < log (q) < 7.8 for our galaxy sample with no significant overall structure. An ionization parameter range of this magnitude is large enough to caution the use of metallicity diagnostics that have not considered the effects of a varying ionization parameter distribution.

KW - Abundances - galaxies

KW - Galaxies

KW - ISM

UR - http://www.scopus.com/inward/record.url?scp=85051496753&partnerID=8YFLogxK

U2 - 10.1093/mnras/sty1782

DO - 10.1093/mnras/sty1782

M3 - Article

SN - 0035-8711

VL - 479

SP - 5235

EP - 5265

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

The SAMI galaxy survey: Spatially resolved metallicity and ionization mapping

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