论文标题
[NII]在z = 2.6的星系中，在122和205UM处的细胞结构发射：全球密集的星际星际介质
[NII] fine-structure emission at 122 and 205um in a galaxy at z=2.6: a globally dense star-forming interstellar medium
论文作者
论文摘要
我们以122UM的Atacama大型毫米/亚毫米阵列和205UM细胞结构线发射在Z = 2.6的强烈镜头的Starburst Galaxy中，提出了新的观察结果。 122/205UM [NII]线比在离子化的星际介质中对电子密度N_E敏感，我们用它来测量跨星系的N_E〜300cm^-3平均。这比银河系平均值高的数量级，但与局部银河形成区域相当。结合对原子碳（CI（1-0））和一氧化碳（CO（4-3））的观察结果，我们揭示了这种强烈的恒星形成系统中的条件。大多数分子星际培养基已驱动到高密度，因此恒星形成的最终爆发产生相应的密度离子相位，可能与无数HII区域共同铺设，这些HII区域散布了富含气体的磁盘。
We present new observations with the Atacama Large Millimeter/sub-millimeter Array of the 122um and 205um fine-structure line emission of singly-ionised nitrogen in a strongly lensed starburst galaxy at z=2.6. The 122/205um [NII] line ratio is sensitive to electron density, n_e, in the ionised interstellar medium, and we use this to measure n_e~300cm^-3 averaged across the galaxy. This is over an order of magnitude higher than the Milky Way average, but comparable to localised Galactic star-forming regions. Combined with observations of the atomic carbon (CI(1-0)) and carbon monoxide (CO(4-3)) in the same system, we reveal the conditions in this intensely star-forming system. The majority of the molecular interstellar medium has been driven to high density, and the resultant conflagration of star formation produces a correspondingly dense ionised phase, presumably co-located with myriad HII regions that litter the gas-rich disk.
