高银纬处的银河卷云：I. 研究光学与远红外强度之间斜率弥散
Galactic Cirri at High Galactic Latitudes: I. Investigating Scatter in Slopes between Optical and far-Infrared Intensities
AI总结：
本文利用DESI光学与IRAS远红外强度斜率构建大样本银河卷云，发现斜率存在4-5倍显著弥散，并归因于尘埃不对称因子和反照率等固有性质的局域变化。
摘要：
基于DESI $g,r$波段与IRAS 100 $\mu m$强度之间的斜率，特别是$k_{g}$和$k_{r}$，我们构建了一个大样本的银河卷云。该样本覆盖了高银纬（|b| $\geq$ 30$^{\circ}$）的561.25平方度天区，使得我们能够在大尺度上系统研究银河卷云的物理参数，例如$g-r$颜色、尘埃温度、不对称因子和反照率。$k_{g}$与$k_{r}$的比值与弥散银河星光模型一致，表明我们银河系内部的弥散星光是卷云的主要照明来源。$k_{g}$和$k_{r}$都随着银纬和IRAS 100 $\mu m$强度的增加而缓慢减小，但它们与银经没有相关性。$k_{g}$和$k_{r}$的分布证实了斜率存在显著的弥散，达到4-5倍。如此大的弥散无法用斜率与银纬及IRAS 100 $\mu m$强度之间的弱相关性来解释。相反，它被归因于尘埃固有性质的显著变化，例如不对称因子和反照率。我们提出尘埃颗粒的性质在观测到的斜率弥散中起着关键作用，使其成为主要的贡献因素。此外，卷云内部尘埃性质的变化是局域性的，而非表现出大尺度梯度。
英文摘要：
Based on the slopes between DESI $g,r$ and IRAS 100 $μm$ intensities, specifically $k_{g}$ and $k_{r}$, we have constructed a substantial sample of Galactic cirri. This sample covers 561.25 deg$^2$ at high Galactic latitudes (|b| $\geq$ 30$^{\circ}$), allowing for a systematic study of the physical parameters of the Galactic cirrus on a large scale, such as $g-r$ color, dust temperature, asymmetry factor and albedo. The ratio of $k_{g}$ and $k_{r}$ is consistent with the diffuse Galactic starlight model, suggesting that the diffuse starlight within our own Galaxy serves as the primary illumination source for the cirrus. Both $k_{g}$ and $k_{r}$ decrease slowly with increasing Galactic latitudes and IRAS 100 $μm$ intensities, while they do not have a correlation with Galactic longitudes. The distribution of $k_{g}$ and $k_{r}$ confirms a significant scatter in the slopes, reaching a factor of 4-5. Such large scatter cannot be explained by the weak correlation between the slopes and Galactic latitudes and IRAS 100 $μm$ intensities. Instead, it is attributed to substantial variations in the intrinsic properties of the dust, e.g., asymmetry factor and albedo. We propose that the properties of dust particles play a critical role in the observed scatter in slopes, making them the primary contributing factors. Moreover, the variations in dust properties within the cirrus are localized rather than exhibiting large-scale gradients.
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