SPHEREx 映射星系平面上的扩散PAH和H II 发射
星系天体物理
2026-03-26 v1
摘要
我们报告了SPHEREx对扩散Galactic辐射中多环烯烃 (PAHs) 和离子化氢气体的映射,并研究了它们在星系平面中的关系。由于于2025年初发射,SPHEREx太空望远镜一直在进行0.75至5.0微米的全天sky近红外光谱调查。我们制作了3.3微米PAH发射特征的大尺度图,该特征在星系平面上明亮且可探测,并与Planck测量的热尘埃辐射呈强相关。我们还通过制作4.05微米Brackett-alpha发射的图来追踪离子化氢气体。通过将两个图结合在一起,我们识别出与离子化气体周围的光化学区相关的PAH发射扩展壳。我们构建了PAH丰度图,发现PAH丰度与离子化氢呈显著反相关,表明在星系平面的离子化气体区域存在系统性PAH耗尽,并表明致电离辐射是PAH丰度变化的主要驱动因素。这些早期的SPHEREx结果提供了PAHs和离子化氢的大尺度视图,预览了该任务对星际介质中扩散发射进行映射的能力。
引用
@article{arxiv.2603.23620,
title = {SPHEREx mapping of diffuse PAH and H II emission in the Galactic plane},
author = {Giulia Murgia and Ari J. Cukierman and Brandon S. Hensley and Matthew L. N. Ashby and James J. Bock and Tzu-Ching Chang and Shuang-Shuang Chen and Yun-Ting Cheng and Yi-Kuan Chiang and Asantha Cooray and Brendan P. Crill and Olivier Doré and C. Darren Dowell and Andreas L. Faisst and Joseph L. Hora and Howard Hui and Miju Kang and Jae Hwan Kang and Phil M. Korngut and Dennis Lee and Jeong-Eun Lee and Bomee Lee and Carey M. Lisse and Daniel C. Masters and Gary J. Melnick and Mary H. Minasyan and Chi H. Nguyen and Roberta Paladini and Volker Tolls and Robin Y. Wen and Michael W. Werner and Michael Zemcov},
journal= {arXiv preprint arXiv:2603.23620},
year = {2026}
}
备注
15 pages, 9 figures