论文标题
星形星系的本地恒星形成速率表面密度和金属关系
The Local Star Formation Rate Surface Density And Metallicity Relation For Star-forming Galaxies
论文作者
论文摘要
我们研究气相金属性（$ z $），局部恒星质量表面密度（$σ_*$）和本地星形地层表面密度（$σ_{\ rm sfr} $）之间的关系。在固定的$σ_ {*} $下，局部金属性随着$σ_ {\ rm sfr} $的减小而增加，反之亦然，对于N2和O3N2的金属校准器而言。另外，在固定的$σ_ {\ rm sfr} $金属度随着$σ_ {*} $的增加而增加，但是在高质量区域，趋势是平坦的。但是，对于N2O2和N2S2校准器，金属对$σ_{\ rm SFR} $的依赖性几乎消失了。我们使用不同的金属校准器研究了$σ_{\ rm sfr} $的局部金属性，并根据校准器的选择找到负/正相关。我们证明O32比（或电离参数）可能取决于固定局部恒星质量表面密度下的恒星形成速率。另外，$σ_*$ - $ z $ - $σ_ {\ rm sfr} $（fmr）的形状取决于金属校准器和恒星质量范围。由于基于经验拟合（N2，O3N2）与电子温度金属性与光电离依赖模型依赖性（N2O2，N2S2）金属校准之间存在巨大差异，因此我们得出的结论是，金属性校准的选择会影响FMR在$σ___ {\ rm sfrm sfrm sfmr上的存在。
We study the relations between gas-phase metallicity ($Z$), local stellar mass surface density ($Σ_*$), and the local star formation surface density ($Σ_{\rm SFR}$) in a sample of 1120 star-forming galaxies from the MaNGA survey. At fixed $Σ_{*}$ the local metallicity increases as decreasing of $Σ_{\rm SFR}$ or vice versa for metallicity calibrators of N2 and O3N2. Alternatively, at fixed $Σ_{\rm SFR}$ metallicity increases as increasing of $Σ_{*}$, but at high mass region, the trend is flatter. However, the dependence of metallicity on $Σ_{\rm SFR}$ is nearly disappeared for N2O2 and N2S2 calibrators. We investigate the local metallicity against $Σ_{\rm SFR}$ with different metallicity calibrators, and find negative/positive correlations depending on the choice of the calibrator. We demonstrate that the O32 ratio (or ionization parameter) is probably dependent on star formation rate at fixed local stellar mass surface density. Additional, the shape of $Σ_*$ -- $Z$ -- $Σ_{\rm SFR}$ (FMR) depends on metallicity calibrator and stellar mass range. Since the large discrepancy between the empirical fitting-based (N2, O3N2) to electronic temperature metallicity and the photoionization model-dependent (N2O2, N2S2) metallicity calibrations, we conclude that the selection of metallicity calibration affects the existence of FMR on $Σ_{\rm SFR}$.
