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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
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, Volume 466, No. 3, Year 2017
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Description
Diffuse ionized gas (DIG) is prevalent in star-forming galaxies. Using a sample of 365 nearly face-on star-forming galaxies observed byMapping Nearby Galaxies at APO, 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, [NII]/Hα, [OII]/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 HII regions towards composite or low-ionization nuclear emission-line region (LI(N)ER)-like regions. A harder ionizing spectrum is needed to explain DIG line ratios. Leaky HII region models can only shift line ratios slightly relative toHII region models, and thus fail to explain the composite/LI(N)ER line ratios displayed by DIG. Our result favours ionization by evolved stars as a major ionization source forDIG with LI(N)ER-like emission. DIG can significantly bias themeasurement 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 to derive metallicities introduces bias in the derived metallicity gradients as large as the gradient itself. The strong-line method of Blanc et al. (IZI hereafter) cannot be applied to DIG to get an accurate metallicity because it currently contains only HII region models that fail to describe the DIG. © 2016 The Authors.
Authors & Co-Authors
Zhang, Kai
United States, Lexington
University of Kentucky
Yan, Renbin
United States, Lexington
University of Kentucky
Bundy, Kevin A.
Japan, Tokyo
The University of Tokyo
Bershady, Matthew A.
United States, Madison
University of Wisconsin-madison
Walterbos, René A.M.
United States, Las Cruces
New Mexico State University
Maiolino, Roberto
United Kingdom, Cambridge
University of Cambridge
Tremonti, Christy A.
United States, Madison
University of Wisconsin-madison
Thomas, Daniel B.
United Kingdom, Portsmouth
University of Portsmouth
Drory, Niv
United States, Austin
The University of Texas at Austin
Jones, Amy M.
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Belfiore, Francesco M.C.
United Kingdom, Cambridge
University of Cambridge
Sánchez, Sebastián F.
Mexico, Mexico
Universidad Nacional Autónoma de México
Diamond-Stanic, Aleksandar M.
United States, Madison
University of Wisconsin-madison
Bizyaev, Dmitry Anatolevich
United States, Sunspot
Apache Point Observatory
Russian Federation, Moscow
Lomonosov Moscow State University
Nitschelm, Christian H.R.
Chile, Antofagasta
Universidad de Antofagasta
Andrews, Brett H.
United States, Pittsburgh
University of Pittsburgh
Brinkmann, Jonathan V.
United States, Sunspot
Apache Point Observatory
Brownstein, Joel R.
United States, Salt Lake City
The University of Utah
Cheung, Edmond
Japan, Tokyo
The University of Tokyo
Li, Cheng
China, Beijing
Tsinghua University
China, Shanghai
Shanghai Astronomical Observatory Chinese Academy of Sciences
Law, David R.
United States, Baltimore
Space Telescope Science Institute
Roman-Lopes, Alexandre
Chile, La Serena
Universidad de la Serena
Oravetz, Daniel J.
United States, Sunspot
Apache Point Observatory
Pan, Kaike
United States, Sunspot
Apache Point Observatory
Storchi-Bergmann, Thaísa
Brazil, Porto Alegre
Universidade Federal do Rio Grande do Sul
Brazil, Rio de Janeiro
Laboratório Interinstitucional de E-astronomia
Simmons, Audrey E.
United States, Sunspot
Apache Point Observatory
Statistics
Citations: 147
Authors: 26
Affiliations: 20
Identifiers
Doi:
10.1093/mnras/stw3308
ISSN:
00358711
Research Areas
Cancer
Environmental