SDSS-IV MaNGA: the impact of diffuse ionized gas on emission-line ratios, interpretation of diagnostic diagrams and gas metallicity measurements
文献类型：期刊论文
| 作者 | Zhang, Kai23; Yan, Renbin23; Bundy, Kevin22; Bershady, Matthew21; Haffner, L. Matthew21; Walterbos, Rene1; Maiolino, Roberto19,20; Tremonti, Christy21; Thomas, Daniel18; Drory, Niv17 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2017-04-01 |
| 卷号 | 466期号:3页码:3217-3243 |
| 关键词 | Galaxies: Abundances Galaxies: Active Galaxies: Evolution Galaxies: Fundamental Parameters Galaxies: Ism |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stw3308 |
| 英文摘要 | Diffuse ionized gas (DIG) is prevalent in star-forming galaxies. Using a sample of 365 nearly face-on star-forming galaxies observed by Mapping 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 Sigma(H alpha) regions display enhanced [S II]/H alpha, [NII]/H alpha, [OII]/H eta and [O I]/H alpha. The gradients in these line ratios are determined by metallicity gradients and O-1 Ha. 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 to HII 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 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, R-23, N2 = [N II]/H alpha and N2S2H alpha 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. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000398418600050 |
| 出版者 | OXFORD UNIV PRESS |
| 源URL | [http://119.78.226.72/handle/331011/32633]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Zhang, Kai |
| 作者单位 | 1.New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA 2.Lab Interinst & E Astron LIneA, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil 3.Univ Fed Rio Grande do Sul, IF, CP 15051, BR-91501970 Porto Alegre, RS, Brazil 4.Univ La Serena, Dept Fis, Fac Ciencias, La Serena 1200, Chile 5.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA 6.Shanghai Astron Observ, Nandan Rd 80, Shanghai 200030, Peoples R China 7.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China 8.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 9.Univ Utah, Dept Phys & Astron, 115 S 1400 E, Salt Lake City, UT 84112 USA 10.Univ Pittsburgh, Dept Phys & Astron, PITT PACC, Pittsburgh, PA 15260 USA |
| 推荐引用方式 GB/T 7714 | Zhang, Kai,Yan, Renbin,Bundy, Kevin,et al. SDSS-IV MaNGA: the impact of diffuse ionized gas on emission-line ratios, interpretation of diagnostic diagrams and gas metallicity measurements[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,466(3):3217-3243. |
| APA | Zhang, Kai.,Yan, Renbin.,Bundy, Kevin.,Bershady, Matthew.,Haffner, L. Matthew.,...&Simmons, Audrey.(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. |
| MLA | Zhang, Kai,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 466.3(2017):3217-3243. |
入库方式： OAI收割
来源：上海天文台
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