The Effect of Bars on the Ionized ISM: Optical Emission Lines from Milky Way Analogs
The Effect of Bars on the Ionized ISM: Optical Emission Lines from Milky Way Analogs
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DOI：
10.3847/1538-4357/ab9fa3
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发表时间：
2020-07
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通讯作者：
D. Krishnarao;C. Tremonti;A. Fraser-McKelvie;K. Kraljic;N. Boardman;K. Masters;R. Benjamin;L. M. Haffner;Amy M. Jones;Z. Pace;G. Zasowski;M. Bershady;D. Bizyaev;J. Brinkmann;J. Brownstein;N. Drory;K. Pan;Kai Zhang
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作者：
D. Krishnarao;C. Tremonti;A. Fraser-McKelvie;K. Kraljic;N. Boardman;K. Masters;R. Benjamin;L. M. Haffner;Amy M. Jones;Z. Pace;G. Zasowski;M. Bershady;D. Bizyaev;J. Brinkmann;J. Brownstein;N. Drory;K. Pan;Kai Zhang
银河系内部的气体最近被证明是宇宙中最接近低电离（核）发射区（LI(N)ER）的例子。为了更好地了解这种气体的性质，研究人员利用积分场光谱法对240个棒星系和250个非棒星系的电离气体条件进行了研究，重点研究了与银河系最相似的星系。利用[N ii] λ6584、Hα、[O iii] λ5007和Hβ的强光谱线发射，通过baldwin - philips - terlevich图诊断了星系和银河系中气体的主要电离机制。与类似的非棒星系相比，棒星系表现出强烈的恒星形成抑制和内部区域复合光谱和LI(N) er样光谱的增加。在恒星总质量非常低或非常高的星系中，这种影响会减弱。来自Galaxy Zoo的Bar mask:3D显示了Bar对电离气体的非轴对称效应，并有助于预测银河系Bar附近电离气体的正面分布。
Gas interior to the bar of the Milky Way has recently been shown to be the closest example of a low-ionization (nuclear) emission region (LI(N)ER) in the universe. To better understand the nature of this gas, a sample of face-on galaxies with integral field spectroscopy is used to study the ionized gas conditions of 240 barred and 250 nonbarred galaxies, focusing on those that are most similar to the Milky Way. Strong optical line emission of [N ii] λ6584, Hα, [O iii] λ5007, and Hβ are used to diagnose the dominant ionization mechanisms of gas across galaxies and the Galaxy via Baldwin–Phillips–Terlevich diagrams. Barred galaxies show a strong suppression of star formation and an increase in composite and LI(N)ER-like spectra in their inner regions when compared with similar nonbarred counterparts. This effect is lessened in galaxies of very low ( ) or very high ( ) total stellar mass. Bar masks from Galaxy Zoo:3D show the bar’s nonaxisymmetric effect on the ionized gas and help predict the face-on distribution of ionized gas conditions near the bar of the Milky Way.