论文标题
半经验星系形成模型中自吻合的休息 - 紫外线颜色的影响
Effects of self-consistent rest-ultraviolet colours in semi-empirical galaxy formation models
论文作者
论文摘要
将高$ z $星系的观察到的休息 - 脱具有量的亮度连接到其内在的亮度（因此恒星形成速率）需要校正灰尘的存在。我们绕过一种使用红外（IR）排放和紫外线颜色之间经验关系的常见尘埃校正方法，而是通过简单（但自愿）的尘埃模型来增强银河系形成的半经验模型，并使用它来共同拟合高$ z $ $ z $ ret-uv的亮度功能（lfs）和颜色 - 摩根式关系（$ m _ {\ mathrm {uv}} $ - $β$）。在这样做的过程中，我们发现紫外线颜色随着观测结果所暗示的，即使在没有尘埃生产，破坏，吸收或几何形状的情况下，紫外线颜色也会随红移（固定的紫外线幅度）而发展。我们的模型中观察到的演变是由于平均恒星年龄的降低以及特定恒星形成率的增长，并增加了$ z $。 The UV extinction, $A_{\mathrm{UV}}$, evolves similarly with redshift, though we find a systematically shallower relation between $A_{\mathrm{UV}}$ and $M_{\mathrm{UV}}$ than that predicted by IRX-$β$ relationships derived from $z \sim 3$ galaxy样品。最后，假设高$1600Å$变速器（$ \ gtrsim 0.6 $）是可靠的LAE指示器，那么星系的有效灰尘表面密度中的适度散布可以解释$ M _ {\ Mathrm {uv}} $ - $β$ - $β$和LAE Fractions中的进化。通过James Webb太空望远镜进行深入调查，可以很容易地测试这些预测。
Connecting the observed rest-ultraviolet (UV) luminosities of high-$z$ galaxies to their intrinsic luminosities (and thus star formation rates) requires correcting for the presence of dust. We bypass a common dust-correction approach that uses empirical relationships between infrared (IR) emission and UV colours, and instead augment a semi-empirical model for galaxy formation with a simple -- but self-consistent -- dust model and use it to jointly fit high-$z$ rest-UV luminosity functions (LFs) and colour-magnitude relations ($M_{\mathrm{UV}}$-$β$). In doing so, we find that UV colours evolve with redshift (at fixed UV magnitude), as suggested by observations, even in cases without underlying evolution in dust production, destruction, absorption, or geometry. The observed evolution in our model arises due to the reduction in the mean stellar age and rise in specific star formation rates with increasing $z$. The UV extinction, $A_{\mathrm{UV}}$, evolves similarly with redshift, though we find a systematically shallower relation between $A_{\mathrm{UV}}$ and $M_{\mathrm{UV}}$ than that predicted by IRX-$β$ relationships derived from $z \sim 3$ galaxy samples. Finally, assuming that high $1600 Å$ transmission ($\gtrsim 0.6$) is a reliable LAE indicator, modest scatter in the effective dust surface density of galaxies can explain the evolution both in $M_{\mathrm{UV}}$-$β$ and LAE fractions. These predictions are readily testable by deep surveys with the James Webb Space Telescope.
