低红移莱曼连续谱巡天 II：关于莱曼连续谱诊断的新认识
星系天体物理
2022-05-18 v1 宇宙学与河外天体物理
摘要
由于星系际中性氢吸收，莱曼连续谱（LyC）在再电离时期（z {\gtrsim} 6）无法被观测到。为识别莱曼连续谱发射体（LCEs）并推断莱曼连续谱的逃逸分数，天文学家已发展出多种莱曼连续谱逃逸的间接诊断方法。利用低红移莱曼连续谱巡天（LzLCS）对 LyC 的观测测量，我们首次对这些诊断方法进行了统计检验。基于 Lyα 的光学深度指标（如峰值速度分离与等效宽度）表现良好，但我们也发现其他诊断指标（如 [O III]/[O II] 通量比与恒星形成率面密度）可预测一个星系是否为 LCE。这些星系性质与莱曼连续谱逃逸分数之间的关系表明，LyC 逃逸强烈依赖于中性氢柱密度、电离参数与恒星反馈。我们发现 LCEs 分布于一系列的恒星质量、金属丰度、恒星形成历史与电离参数范围内，这可能意味着 LyC 逃逸具有间歇性和/或不同的物理成因。
引用
@article{arxiv.2203.15649,
title = {The Low-Redshift Lyman Continuum Survey II: New Insights into LyC Diagnostics},
author = {Sophia R. Flury and Anne E. Jaskot and Harry C. Ferguson and Gabor Worseck and Kirill Makan and John Chisholm and Alberto Saldana-Lopez and Daniel Schaerer and Stephan McCandliss and Bingjie Wang and N. M. Ford and M. S. Oey and Timothy Heckman and Zhiyuan Ji and Mauro Giavalisco and Ricardo Amorin and Hakim Atek and Jeremy Blaizot and Sanchayeeta Borthakur and Cody Carr and Marco Castellano and Stefano Cristiani and Stephane de Barros and Mark Dickinson and Steven L. Finkelstein and Brian Fleming and Fabio Fontanot and Thibault Garel and Andrea Grazian and Matthew Hayes and Alaina Henry and Valentin Mauerhofer and Genoveva Micheva and Goran Ostlin and Casey Papovich and Laura Pentericci and Swara Ravindranath and Joakim Rosdahl and Michael Rutkowski and Paola Santini and Claudia Scarlata and Harry Teplitz and Trinh Thuan and Maxime Trebitsch and Eros Vanzella and Anne Verhamme and Xinfeng Xu},
journal= {arXiv preprint arXiv:2203.15649},
year = {2022}
}
备注
ApJ, accepted. 31 pages, 26 figures, 1 table