棒旋结构对电离星际介质的影响：来自银河系类比星系的光学发射线
摘要
银河系棒内气体最近被证实为宇宙中最近的低电离（核）发射区——LI(N)ER——例子。为更好理解该气体性质，我们利用具有积分视场光谱的面朝星系样本，研究 240 个有棒与 250 个无棒星系的电离气体条件，重点关注与银河系最相似的那些。利用 [NII] λ6584、Hα、[OIII] λ5007 与 Hβ 的强光学线发射，通过 Baldwin-Phillips-Terlevich（BPT）图诊断跨星系及银河系气体的主导电离机制。与相似的无棒对应体相比，有棒星系在内区表现出恒星形成的强烈抑制，以及复合与类 LI(N)ER 光谱的增加。该效应在总恒星质量极低（log₁₀(M_⋆/M_⊙) ≲ 10.4）或极高（log₁₀(M_⋆/M_⊙) ≳ 11.1）的星系中减弱。来自 Galaxy Zoo:3D 的棒掩模显示了棒对电离气体的非轴对称效应，并有助于预测银河系棒附近电离气体条件的面朝分布。
引用
@article{arxiv.2007.01874,
title = {The Effect of Bars on the Ionized ISM: Optical Emission Lines from Milky Way Analogs},
author = {Dhanesh Krishnarao and Christy Tremonti and Amelia Fraser-McKelvie and Katarina Kraljic and Nicholas Fraser Boardman and Karen L. Masters and Robert A. Benjamin and L. Matthew Haffner and Amy Jones and Zachary J. Pace and Gail Zasowski and Matthew Bershady and Dmitry Bizyaev and Jonathan Brinkmann and Joel R. Brownstein and Niv Drory and Kaike Pan and Kai Zhang},
journal= {arXiv preprint arXiv:2007.01874},
year = {2020}
}
备注
20 pages, 14 Figures, Accepted for publication in ApJ. Figure 8, 9, and 12 are animations accessible using a PDF viewer such as Acrobat Reader or online: (http://www.astronomy.dk/images/MaNGA_BarredAnimations/RadialBPT_KDE_Combined.mp4), (http://www.astronomy.dk/images/MaNGA_BarredAnimations/MassBinnedBPT.mp4), (http://www.astronomy.dk/images/MaNGA_BarredAnimations/BarLength_BPT_Radial_KDE.mp4)