arXiv 2210.019822022-10-05astro-ph.GA

邻近成星星系WISE 12 $μ$ m辐射与亚千秒差距分子气体示踪物的相关性

The correlation between WISE 12 $μ$m emission and molecular gas tracers on sub-kpc scales in nearby star-forming galaxies

Yang Gao, Qing-Hua Tan, Yu Gao, Min Fang, Ryan Chown, Qian Jiao, Chun-Sheng Luo

备注：: 16 pages, 7 figures, accepted for publication in ApJ
DOI：: 10.3847/1538-4357/ac9af1

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摘要：

我们补充马拉当致密气体样品在附近的星系与档案观测的$^{12}\rm CO$及其同位素，以确定宽视场红外巡天探测器（WISE）12 $μ$ m的排放和分子气体示踪剂在次千秒差距尺度之间的标度关系。我们发现12 $μ$ m光度与$^{12}\rm CO$的相关性比与$^{13}\rm CO$或致密气体示踪剂的相关性更紧密。在$Σ_{\rm mol}$非常低的区域（$\sim 10~{\rm M_{\odot}~pc^{-2}}$），预测和观察到的$^{12}\rm CO$之间的残差仅与分子气体质量表面密度（$Σ_{\rm mol}$）弱相关。在此极限以上，$^{12}\rm CO$残差与分子气体的物理条件没有相关性，而$^{13}\rm CO$残差取决于气体的光学深度和温度。通过分析星系与星系之间的差异，我们证实了$^{12}\rm CO$-12 $μ$ m关系是强有力的和统计上的强大的恒星形成星系和活动星系核主机。这些结果表明，WISE 12 $μ$ m排放可用于追踪总分子气体而不是致密分子气体，这可能是因为多环芳烃（PAH，WISE 12 $μ$ m排放的主要贡献者）可与$^{12}\rm CO$追踪的气体充分混合。我们建议WISE 12 $μ$ m光度可以用来估计分子气体的表面密度，用于星系恒星形成过程的统计分析。

英文摘要：

We complement the MALATANG sample of dense gas in nearby galaxies with archival observations of $^{12}\rm CO$ and its isotopologues to determine scaling relations between Wide-field Infrared Survey Explorer (WISE) 12 $μ$m emission and molecular gas tracers at sub-kiloparsec scales. We find that 12 $μ$m luminosity is more tightly correlated with $^{12}\rm CO$ than it is with $^{13}\rm CO$ or dense gas tracers. Residuals between predicted and observed $^{12}\rm CO$ are only weakly correlated with molecular gas mass surface density ($Σ_{\rm mol}$) in regions where $Σ_{\rm mol}$ is very low ($\sim 10~{\rm M_{\odot}~pc^{-2}}$). Above this limit, the $^{12}\rm CO$ residuals show no correlations with physical conditions of molecular gas, while $^{13}\rm CO$ residuals depend on the gas optical depth and temperature. By analyzing differences from galaxy to galaxy, we confirm that the $^{12}\rm CO$-12 $μ$m relation is strong and statistically robust with respect to star forming galaxies and AGN hosts. These results suggest that WISE 12 $μ$m emission can be used to trace total molecular gas instead of dense molecular gas, likely because polycyclic aromatic hydrocarbons (PAHs, a major contributor to WISE 12 $μ$m~emission) may be well-mixed with the gas that is traced by $^{12}\rm CO$. We propose that WISE 12 $μ$m luminosity can be used to estimate molecular gas surface density for statistical analyses of the star formation process in galaxies.

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