论文标题
Spitzer对星系中多环芳烃的观点
Spitzer's perspective of polycyclic aromatic hydrocarbons in galaxies
论文作者
论文摘要
多环芳烃（PAH）分子，如在3.3、6.2、6.2、6.2、7.7、8.6、11.3和12.7 $ $ $ $ $ m m的振动模式特征的独特发射带所揭示的，在整个宇宙中都是丰富的，广泛。它们在各种天体物理区域中都可以看到它们，从围绕年轻恒星的行星形成圆盘到银河系的星际介质（ISM），以及外部星系到Z> 4处的高红移。 PAHS通过主导气体的光电加热并控制电离平衡来深刻影响ISM的热预算和化学。 在这里，我们回顾了PAHS天体物理学的当前知识状态，重点是从Spitzer空间望远镜获得的观察性特征及其诊断能力，以探测局部物理和化学条件和过程。特别注意PAH的光谱特性及其在spitzer上的红外光谱仪（IRS）揭示的变化，跨越更广泛的外交环境（例如，遥远的星系，早期类型的星系，银河系的星系，银河系卤素，有效的iSO）或其他可能的核心（伊斯基），与任何其他可能的相比，远处的星系，早期类型的星系）（可能是任何可能的）望远镜设施。同样强调的是Spitzer首次建立的PAH丰度与星系金属性之间的关系。
Polycyclic aromatic hydrocarbon (PAH) molecules, as revealed by the distinctive set of emission bands at 3.3, 6.2, 7.7, 8.6, 11.3 and 12.7 $μ$m characteristic of their vibrational modes, are abundant and widespread throughout the Universe. They are ubiquitously seen in a wide variety of astrophysical regions, ranging from planet-forming disks around young stars to the interstellar medium (ISM) of the Milky Way and external galaxies out to high redshifts at z>4. PAHs profoundly influence the thermal budget and chemistry of the ISM by dominating the photoelectric heating of the gas and controlling the ionization balance. Here, we review the current state of knowledge of the astrophysics of PAHs, focusing on their observational characteristics obtained from the Spitzer Space Telescope and their diagnostic power for probing the local physical and chemical conditions and processes. Special attention is paid to the spectral properties of PAHs and their variations revealed by the Infrared Spectrograph (IRS) on board Spitzer across a much broader range of extragalactic environments (e.g., distant galaxies, early-type galaxies, galactic halos, active galactic nuclei, and low-metallicity galaxies) than was previously possible with the Infrared Space Observatory (ISO) or any other telescope facilities. Also highlighted is the relation between the PAH abundance and the galaxy metallicity established for the first time by Spitzer.
