论文标题
本地星系中的中红外颜色关系
Mid and Far-Infrared Color-Color Relations within Local Galaxies
论文作者
论文摘要
我们对当地星系样本进行了广泛的档案分析，结合了来自Galex，Spitzer和Herschel的多波长数据，以研究观察到的红外光谱频谱分布（IR SEDS）内的“蓝边”中边红外（miR）和“红色侧”远征（FIR）颜色色的相关性。我们的样本在很大程度上由翠鸟星系组成，其中包括NGC5236（M83）和NGC4449在内的精选少数几个。通过来自Far-ultraviolet FUV（$ {\ sim} 0.15 $ $ $ m $ m）的数据，直到500 $μ$ m m响应到共同的角度分辨率，我们测量的光度计是$ kpc $ scale star-forming区域36 $ 36 $“ \ times times $ $ 36 $” $。恒星形成率（SFR），恒星质量和金属性分布均得出了整个样本。专注于$ f_ {70}/f_ {500} $“ fir”和$ f_ {8}/f_ {24} $“ mir”通量密度比（颜色），我们发现星系子样本表现出强烈的IR颜色色素相关性在其星形形成区域内，而其他颜色则表现出未经彩色的颜色。该分裂由两个主要影响驱动：1）恒星形成（SF）的局部强度和2）星际介质（ISM）的金属含量。星系均匀地以SF的高表面密度为主（例如NGC5236）表现出很强的IR颜色相关性，而表现出较低水平的SF和混合环境（例如NGC5457）的星系表现出较弱或无相关性的相关性 - 通过与彩色颜色的颜色相关的效果，可以表明相关性或无相关性。我们发现在sfr- $ l_ {8} $（8 $μ$ m亮度）关系中，该关系由金属分布所追踪，与现存的研究一致，强调了其在不同系统/样品中的SFR指示器的问题用途。
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.
