论文标题
漩涡星系中的空间分辨PAH特性（M51A）
The spatially resolved PAH characteristics in the Whirlpool Galaxy (M51a)
论文作者
论文摘要
我们介绍了一项关于使用Spitzer-IRS观测值的（托管）核区域（NR）（NR）（NR）（NR）（NR）（NR）（NR）（NR）（NR）（ENRS）中的空间分辨的多环芳基碳（PAH）发射特性的详细研究。彼此检查了PAH强度比之间的相关性，局部物理参数，半乳酸中心距离（$ r_ {g} $）和非常小的谷物（VSG）发射。与H $ _ {\ Mathrm {ii}} $ M33和M83区域中的中红外排放功能进行了其他比较。 NR在PAH强度比之间表现出最强的相关性，而ENR则显示出归因于ISM发射的散射增加。总体而言，辐射场硬度对PAH排放的影响要比金属性更高，而后者则调节PAH方差为$ r_ {g} $的函数。具体而言，与大型PAH相比，PAH发射相对于不同的物理参数的方差表明，小/培养基处理的速率更高，而随着半乳酸距离的增加而形成的小型PAH的比率更高。我们发现在M51A的NR中的7.7 $ $ M载体与M83的H $ _ {\ Mathrm {ii}} $区域，M51A的NR和M33 H $ _ {\ MATHRM {II}} $ carriers和M51的M51A和M33 H $ _ {\ MATHRM { M83的H $ _ {\ Mathrm {II}} $区域。我们已经确定了PAH/VSG与PAH强度比之间的正相关。我们得出的结论是，PAH和VSG的相对丰度不仅是由于辐射场的硬度驱动的。
We present a detailed study on the spatially resolved polycyclic aromatic hydrocarbon (PAH) emission properties in the (circum)nuclear region (NR) and extranuclear regions (ENRs) of M51a using Spitzer-IRS observations. Correlations among PAH intensity ratios are examined with respect to each other, local physical parameters, galactocentric distance ($R_{g}$), and very small grain (VSG) emission. Additional comparison is performed with the mid-infrared emission features in the H$_{\mathrm{II}}$ regions of M33 and M83. The NR exhibits the strongest correlation among the PAH intensity ratios, whereas ENRs are showing increased scatter attributed to ISM emission. Overall, the radiation field hardness has a higher impact on PAH emission than metallicity, with the latter regulating PAH variance as a function of $R_{g}$. Specifically, the variance of PAH emission with respect to the different physical parameters suggests a higher rate of small/medium PAH processing compared to large PAHs and a higher ratio of small-to-large PAHs formed with increasing galactocentric distance. We find similarities between the 7.7 $μ$m carriers in M51a's NR and M83's H$_{\mathrm{II}}$ regions, the 8.6 $μ$m carriers in M51a's NR and M33 H$_{\mathrm{II}}$ regions, and both types of carriers between M51a's ENRs, M33's, and M83's H$_{\mathrm{II}}$ regions. We have identified a positive correlation between PAH/VSG and the PAH intensity ratios. We conclude that the relative abundance of PAHs and VSG is not solely driven by the hardness of the radiation field.
