局域星系中的中远红外色-色关系
Mid and Far-Infrared Color-Color Relations within Local Galaxies
摘要：
我们提出了一个广泛的档案分析的本地星系的样本，结合多波长数据从GALEX，斯皮策和赫歇尔调查“蓝边”中红外（MIR）和“红边”远红外（FIR）的颜色的相关性内观察到的红外光谱能量分布（IR SED）。我们的样本主要由金鱼星系组成，还包括一些重要的选择，包括NGC 5236（M83）和NGC 4449。利用从远紫外FUV（${\sim}0.15$ $μ$ m）到500 $μ$ m的数据卷积到共同的角分辨率，我们测量$kpc$尺度恒星形成区域36 $"\times$ 36 $"$的大小的光度。恒星形成率（SFR），恒星质量和金属丰度分布在整个我们的样本。聚焦于$f_{70}/f_{500}$“FIR”和$f_{8}/f_{24}$“MIR”的通量密度比（颜色），我们发现一个子样本的星系表现出强烈的红外颜色的颜色相关性在其恒星形成区域，而其他表现出不相关的颜色。这种划分是由两个主要的影响：1）恒星形成的局部强度（SF）和2）星际介质的金属含量（ISM）。均匀地由高表面密度的SF（例如NGC 5236）占主导地位的星系表现出强烈的红外颜色-颜色相关性，而表现出较低水平的SF和混合环境（例如NGC 5457）的星系表现出较弱或没有相关性-通过不同的ISM加热和金属含量对红外颜色的影响越来越大来解释，特别是在MIR中。我们发现大的分散在SFR- $L_{8}$（8 $μ$米光度）的关系，跟踪的金属丰度分布，与现存的研究一致，突出其问题的使用作为SFR指标在不同的系统/样品。
英文摘要：
We present an extensive archival analysis of a sample of local galaxies, combining multi-wavelength data from GALEX, Spitzer and Herschel to investigate "blue-side" mid-infrared (MIR) and "red-side" far-infrared (FIR) color-color correlations within the observed infrared spectral energy distributions (IR SEDs). Our sample largely consists of the KINGFISH galaxies, with the important addition of a select few including NGC5236 (M83) and NGC4449. With data from the far-ultraviolet FUV (${\sim}0.15$ $μ$m) through 500 $μ$m convolved to common angular resolution, we measure photometry of $kpc$-scale star-forming regions 36$"\times$36$"$ in size. Star formation rates (SFRs), stellar masses and metallicity distributions are derived throughout our sample. Focusing on the $f_{70}/f_{500}$ "FIR" and $f_{8}/f_{24}$ "MIR" flux density ratios (colors), we find that a sub-sample of galaxies demonstrate a strong IR color-color correlation within their star-forming regions, while others demonstrate uncorrelated colors. This division is driven by two main effects: 1) the local strength of star formation (SF) and 2) the metal content of the interstellar medium (ISM). Galaxies uniformly dominated by high surface densities of SF (e.g. NGC5236) demonstrate strong IR color-color correlations, while galaxies that exhibit lower levels of SF and mixed environments (e.g. NGC5457) demonstrate weaker or no correlation--explained by the increasing effect of varying ISM heating and metal content on the IR colors, specifically in the MIR. We find large dispersion in the SFR-$L_{8}$ (8 $μ$m luminosity) relation that is traced by the metallicity distributions, consistent with extant studies, highlighting its problematic use as a SFR indicator across diverse systems/samples.
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