论文标题
从内星系中发现弥漫性光发射线：Li（N）ER样气的证据
Discovery of diffuse optical emission lines from the inner Galaxy: Evidence for LI(N)ER-like gas
论文作者
论文摘要
光发射线用于根据其主要的中央辐射来源将星系分为三组：活跃的银河系核，恒星形成或低离子化（核）发射区[li（n）ERS]，这些区域可能会从较老的恒星种群中痕迹。使用威斯康星州H-Alpha映射器，我们在银河中心八度范围内检测到低渗透窗口中的光线发射。该发射与中性气体的1.5 kiloparsec-radius“倾斜盘”有关。我们修改了该磁盘的模型，发现观察到的氢气至少为$ 48 \％$电离。比率[nii] $λ$ 6584 $ \ overset {\ lower.5em \ circ} {\ mathrm {a}} $/h $α$ $α$ $ $ 6563 $ 6563 $ \ overset {\ lower.5em \ counc} [oiii] $λ$ 5007 $ \ overset {\ lower.5em \ circ} {\ mathrm {a}} $和h $β$ $ $ $ $ $λ$ 4861 $ \ overset {\ lower.5em \ circ} {\ mathrm {a a} $也被检测到。大多数倾斜磁盘视线的线比是Li（N）ER星系的特征。
Optical emission lines are used to categorize galaxies into three groups according to their dominant central radiation source: active galactic nuclei, star formation, or low-ionization (nuclear) emission regions [LI(N)ERs] that may trace ionizing radiation from older stellar populations. Using the Wisconsin H-Alpha Mapper, we detect optical line emission in low-extinction windows within eight degrees of Galactic Center. The emission is associated with the 1.5-kiloparsec-radius "Tilted Disk" of neutral gas. We modify a model of this disk and find that the hydrogen gas observed is at least $48\%$ ionized. The ratio [NII] $λ$6584 $\overset{\lower.5em\circ}{\mathrm{A}}$/H$α$ $λ$6563 $\overset{\lower.5em\circ}{\mathrm{A}}$ increases from 0.3 to 2.5 with Galactocentric radius; [OIII] $λ$5007 $\overset{\lower.5em\circ}{\mathrm{A}}$ and H$β$ $λ$4861 $\overset{\lower.5em\circ}{\mathrm{A}}$ are also sometimes detected. The line ratios for most Tilted Disk sightlines are characteristic of LI(N)ER galaxies.
