We present preliminary results of a submillimeter spectral line survey of a strongly lensed dusty star-forming galaxy (DSFG) at z∼2, near the peak epoch of cosmic star formation. We use data from the Submillimeter Array, which recently completed a systems upgrade that substantially increased the instantaneous bandwidth. Focusing on the brightest spectral lines of CO and atomic carbon, we characterize the interstellar medium properties of this galaxy. We find highly excited CO and [C i] emission, and a large [C i] line ratio implies a higher excitation temperature than other extreme high-redshift sources. Based on this evidence, we infer that the source likely hosts a dust-obscured active galactic nucleus similar to other well-studied DSFGs.

我们展示了在z ∼ 2，接近宇宙恒星形成的峰值时期的强透镜尘埃恒星形成星系 (DSFG) 的亚毫米谱线调查的初步结果。我们使用来自亚毫米阵列的数据，该阵列最近完成了系统升级，显着增加了瞬时带宽。关注 CO 和原子碳的最亮光谱线，我们表征了这个星系的星际介质特性。我们发现高度激发的 CO 和 [C  i ] 发射，大的 [C  i ] 线比意味着比其他极端高红移源更高的激发温度。基于这一证据，我们推断该源可能拥有一个尘埃遮蔽的活动星系核，类似于其他研究良好的 DSFG。