年轻，紫外线明亮的恒星在恒星形成星系中占主导地位
Young, UV-bright Stars Dominate Dust Heating in Star Forming Galaxies
摘要：
在恒星形成的星系中，尘埃在塑造紫外线（UV）到红外线（IR）光谱方面起着重要作用。尘埃衰减恒星辐射，并通过平衡和非平衡发射再辐射能量。多环芳烃（PAH）、石墨和硅酸盐在光谱能量分布中贡献了不同的特征;然而，它们在相同的光谱区域（UV）中都是高度不透明的。与老的恒星星族相比，年轻的恒星族在紫外线中释放的总光度更高，这使它们成为高能紫外线光子的良好来源，可以为尘埃发射提供动力。然而，考虑到它们的相对丰度，年轻或年老的恒星星族是否提供了大部分这些光子来驱动红外辐射是一个有趣的问题。利用斯皮策太空望远镜观测到的三个星系样本和我们的尘埃辐射转移模型，我们发现年轻的恒星星族（约1亿岁）主导了恒星形成星系中的尘埃加热，而老的恒星星族（130亿岁）通常贡献不到20%的远红外光度。
英文摘要：
In star forming galaxies, dust plays a significant role in shaping the ultraviolet (UV) through infrared (IR) spectrum. Dust attenuates the radiation from stars, and re-radiates the energy through equilibrium and non-equilibrium emission. Polycyclic aromatic hydrocarbons (PAH), graphite, and silicates contribute to different features in the spectral energy distribution; however, they are all highly opaque in the same spectral region - the UV. Compared to old stellar populations, young populations release a higher fraction of their total luminosity in the UV, making them a good source of the energetic UV photons that can power dust emission. However, given their relative abundance, the question of whether young or old stellar populations provide most of these photons that power the infrared emission is an interesting question. Using three samples of galaxies observed with the Spitzer Space Telescope and our dusty radiative transfer model, we find that young stellar populations (on the order of 100 million years old) dominate the dust heating in star forming galaxies, and old stellar populations (13 billion years old) generally contribute less than 20% of the far-IR luminosity.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
