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SDSS-IV MaNGA: the impact of Diffuse Ionized Gas on emission-line ratios, interpretation of diagnostic diagrams, and gas metallicity measurements

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SDSS-IV MaNGA : the impact of Diffuse Ionized Gas on emission-line ratios, interpretation of diagnostic diagrams, and gas metallicity measurements. / Zhang, Kai; Yan, Renbin; Bundy, Kevin; Bershady, Matthew; Haffner, L. Matthew; Walterbos, René; Maiolino, Roberto; Tremonti, Christy; Thomas, Daniel; Drory, Niv; Jones, Amy; Belfiore, Francesco; Sánchez, Sebastian F.; Diamond-Stanic, Aleksandar M.; Bizyaev, Dmitry; Nitschelm, Christian; Andrews, Brett; Brinkmann, Jon; Brownstein, Joel R.; Cheung, Edmond; Li, Cheng; Law, David R.; Lopes, Alexandre Roman; Oravetz, Daniel; Pan, Kaike; Storchi-Bergmann, Thaisa; Simmons, Audrey.

In: Monthly Notices of the Royal Astronomical Society, Vol. 466, No. 3, 04.2017, p. 3217-3243.

Research output: Contribution to journalArticle

Harvard

Zhang, K, Yan, R, Bundy, K, Bershady, M, Haffner, LM, Walterbos, R, Maiolino, R, Tremonti, C, Thomas, D, Drory, N, Jones, A, Belfiore, F, Sánchez, SF, Diamond-Stanic, AM, Bizyaev, D, Nitschelm, C, Andrews, B, Brinkmann, J, Brownstein, JR, Cheung, E, Li, C, Law, DR, Lopes, AR, Oravetz, D, Pan, K, Storchi-Bergmann, T & Simmons, A 2017, 'SDSS-IV MaNGA: the impact of Diffuse Ionized Gas on emission-line ratios, interpretation of diagnostic diagrams, and gas metallicity measurements', Monthly Notices of the Royal Astronomical Society, vol. 466, no. 3, pp. 3217-3243. https://doi.org/10.1093/mnras/stw3308

APA

Zhang, K., Yan, R., Bundy, K., Bershady, M., Haffner, L. M., Walterbos, R., ... Simmons, A. (2017). SDSS-IV MaNGA: the impact of Diffuse Ionized Gas on emission-line ratios, interpretation of diagnostic diagrams, and gas metallicity measurements. Monthly Notices of the Royal Astronomical Society, 466(3), 3217-3243. https://doi.org/10.1093/mnras/stw3308

Vancouver

Zhang K, Yan R, Bundy K, Bershady M, Haffner LM, Walterbos R et al. SDSS-IV MaNGA: the impact of Diffuse Ionized Gas on emission-line ratios, interpretation of diagnostic diagrams, and gas metallicity measurements. Monthly Notices of the Royal Astronomical Society. 2017 Apr;466(3):3217-3243. https://doi.org/10.1093/mnras/stw3308

Author

Zhang, Kai ; Yan, Renbin ; Bundy, Kevin ; Bershady, Matthew ; Haffner, L. Matthew ; Walterbos, René ; Maiolino, Roberto ; Tremonti, Christy ; Thomas, Daniel ; Drory, Niv ; Jones, Amy ; Belfiore, Francesco ; Sánchez, Sebastian F. ; Diamond-Stanic, Aleksandar M. ; Bizyaev, Dmitry ; Nitschelm, Christian ; Andrews, Brett ; Brinkmann, Jon ; Brownstein, Joel R. ; Cheung, Edmond ; Li, Cheng ; Law, David R. ; Lopes, Alexandre Roman ; Oravetz, Daniel ; Pan, Kaike ; Storchi-Bergmann, Thaisa ; Simmons, Audrey. / SDSS-IV MaNGA : the impact of Diffuse Ionized Gas on emission-line ratios, interpretation of diagnostic diagrams, and gas metallicity measurements. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 466, No. 3. pp. 3217-3243.

Bibtex

@article{819108261c584a1d8fa056e19661fe37,
title = "SDSS-IV MaNGA: the impact of Diffuse Ionized Gas on emission-line ratios, interpretation of diagnostic diagrams, and gas metallicity measurements",
abstract = "Diffuse Ionized Gas (DIG) is prevalent in star-forming galaxies. Using a sample of 365 nearly face-on star-forming galaxies observed by MaNGA, we demonstrate how DIG in star-forming galaxies impacts the measurements of emission line ratios, hence the interpretation of diagnostic diagrams and gas-phase metallicity measurements. At fixed metallicity, DIG-dominated low ΣHα regions display enhanced [S II]/Hα, [N II]/Hα, [O II]/Hβ, and [O I]/Hα. The gradients in these line ratios are determined by metallicity gradients and ΣHα. In line ratio diagnostic diagrams, contamination by DIG moves H II regions towards composite or LI(N)ER-like regions. A harder ionizing spectrum is needed to explain DIG line ratios. Leaky H II region models can only shift line ratios slightly relative to H II region models, and thus fail to explain the composite/LI(N)ER line ratios displayed by DIG. Our result favors ionization by evolved stars as a major ionization source for DIG with LI(N)ER-like emission. DIG can significantly bias the measurement of gas metallicity and metallicity gradients derived using strong-line methods. Metallicities derived using N2O2 are optimal because they exhibit the smallest bias and error. Using O3N2, R23, N2=[N II]/Hα, and N2S2Hα (Dopita et al. 2016) to derive metallicities introduces bias in the derived metallicity gradients as large as the gradient itself. The strong-line method of Blanc et al. (2015; IZI hereafter) cannot be applied to DIG to get an accurate metallicity because it currently contains only H II region models which fail to describe the DIG.",
keywords = "astro-ph.GA, galaxies: surveys, galaxies: evolution, galaxies: fundamental parame- ters, galaxies: ISM, galaxies: abundances, galaxies: active, RCUK, STFC",
author = "Kai Zhang and Renbin Yan and Kevin Bundy and Matthew Bershady and Haffner, {L. Matthew} and Ren{\'e} Walterbos and Roberto Maiolino and Christy Tremonti and Daniel Thomas and Niv Drory and Amy Jones and Francesco Belfiore and S{\'a}nchez, {Sebastian F.} and Diamond-Stanic, {Aleksandar M.} and Dmitry Bizyaev and Christian Nitschelm and Brett Andrews and Jon Brinkmann and Brownstein, {Joel R.} and Edmond Cheung and Cheng Li and Law, {David R.} and Lopes, {Alexandre Roman} and Daniel Oravetz and Kaike Pan and Thaisa Storchi-Bergmann and Audrey Simmons",
note = "Accepted for publication in MNRAS, 30 pages, 32 figures",
year = "2017",
month = "4",
doi = "10.1093/mnras/stw3308",
language = "English",
volume = "466",
pages = "3217--3243",
journal = "MNRAS",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",

}

RIS

TY - JOUR

T1 - SDSS-IV MaNGA

T2 - the impact of Diffuse Ionized Gas on emission-line ratios, interpretation of diagnostic diagrams, and gas metallicity measurements

AU - Zhang, Kai

AU - Yan, Renbin

AU - Bundy, Kevin

AU - Bershady, Matthew

AU - Haffner, L. Matthew

AU - Walterbos, René

AU - Maiolino, Roberto

AU - Tremonti, Christy

AU - Thomas, Daniel

AU - Drory, Niv

AU - Jones, Amy

AU - Belfiore, Francesco

AU - Sánchez, Sebastian F.

AU - Diamond-Stanic, Aleksandar M.

AU - Bizyaev, Dmitry

AU - Nitschelm, Christian

AU - Andrews, Brett

AU - Brinkmann, Jon

AU - Brownstein, Joel R.

AU - Cheung, Edmond

AU - Li, Cheng

AU - Law, David R.

AU - Lopes, Alexandre Roman

AU - Oravetz, Daniel

AU - Pan, Kaike

AU - Storchi-Bergmann, Thaisa

AU - Simmons, Audrey

N1 - Accepted for publication in MNRAS, 30 pages, 32 figures

PY - 2017/4

Y1 - 2017/4

N2 - Diffuse Ionized Gas (DIG) is prevalent in star-forming galaxies. Using a sample of 365 nearly face-on star-forming galaxies observed by MaNGA, we demonstrate how DIG in star-forming galaxies impacts the measurements of emission line ratios, hence the interpretation of diagnostic diagrams and gas-phase metallicity measurements. At fixed metallicity, DIG-dominated low ΣHα regions display enhanced [S II]/Hα, [N II]/Hα, [O II]/Hβ, and [O I]/Hα. The gradients in these line ratios are determined by metallicity gradients and ΣHα. In line ratio diagnostic diagrams, contamination by DIG moves H II regions towards composite or LI(N)ER-like regions. A harder ionizing spectrum is needed to explain DIG line ratios. Leaky H II region models can only shift line ratios slightly relative to H II region models, and thus fail to explain the composite/LI(N)ER line ratios displayed by DIG. Our result favors ionization by evolved stars as a major ionization source for DIG with LI(N)ER-like emission. DIG can significantly bias the measurement of gas metallicity and metallicity gradients derived using strong-line methods. Metallicities derived using N2O2 are optimal because they exhibit the smallest bias and error. Using O3N2, R23, N2=[N II]/Hα, and N2S2Hα (Dopita et al. 2016) to derive metallicities introduces bias in the derived metallicity gradients as large as the gradient itself. The strong-line method of Blanc et al. (2015; IZI hereafter) cannot be applied to DIG to get an accurate metallicity because it currently contains only H II region models which fail to describe the DIG.

AB - Diffuse Ionized Gas (DIG) is prevalent in star-forming galaxies. Using a sample of 365 nearly face-on star-forming galaxies observed by MaNGA, we demonstrate how DIG in star-forming galaxies impacts the measurements of emission line ratios, hence the interpretation of diagnostic diagrams and gas-phase metallicity measurements. At fixed metallicity, DIG-dominated low ΣHα regions display enhanced [S II]/Hα, [N II]/Hα, [O II]/Hβ, and [O I]/Hα. The gradients in these line ratios are determined by metallicity gradients and ΣHα. In line ratio diagnostic diagrams, contamination by DIG moves H II regions towards composite or LI(N)ER-like regions. A harder ionizing spectrum is needed to explain DIG line ratios. Leaky H II region models can only shift line ratios slightly relative to H II region models, and thus fail to explain the composite/LI(N)ER line ratios displayed by DIG. Our result favors ionization by evolved stars as a major ionization source for DIG with LI(N)ER-like emission. DIG can significantly bias the measurement of gas metallicity and metallicity gradients derived using strong-line methods. Metallicities derived using N2O2 are optimal because they exhibit the smallest bias and error. Using O3N2, R23, N2=[N II]/Hα, and N2S2Hα (Dopita et al. 2016) to derive metallicities introduces bias in the derived metallicity gradients as large as the gradient itself. The strong-line method of Blanc et al. (2015; IZI hereafter) cannot be applied to DIG to get an accurate metallicity because it currently contains only H II region models which fail to describe the DIG.

KW - astro-ph.GA

KW - galaxies: surveys

KW - galaxies: evolution

KW - galaxies: fundamental parame- ters

KW - galaxies: ISM

KW - galaxies: abundances

KW - galaxies: active

KW - RCUK

KW - STFC

U2 - 10.1093/mnras/stw3308

DO - 10.1093/mnras/stw3308

M3 - Article

VL - 466

SP - 3217

EP - 3243

JO - MNRAS

JF - MNRAS

SN - 0035-8711

IS - 3

ER -

ID: 5521970