标题： ALMA Band-9观测两个高红移星系中的[NII] 122微米谱线和远红外连续谱 显示英文标题

标题： Band-9 ALMA observations of the [NII] 122 micron line and FIR continuum in two high-z galaxies

摘要： 我们展示了对两个高红移系统（SMMJ02399-0136 和四重影像类星体 QSO）的阿塔卡马大型毫米波/亚毫米波阵列（ALMA）观测，观测波段为其本征122微米连续谱（~650 GHz 或 ~450 微米地面上）以及[NII] 122微米谱线发射。 使用合成孔径约为0.25"的连续观测成功解析了这两个源，并恢复了预期的流量。四重影像被解析为部分爱因斯坦环，而SMMJ02399-0136明确分离为两部分：一个与活动星系核相关的点源和一个之前识别出的尘埃星暴位置上的扩展区域。 我们在两个系统中都探测到了[NII]谱线，但比之前使用第一代z（红移）和早期宇宙光谱仪所获得的探测要弱得多。我们表明，如果由于显著扩展的发射和比预期更长的ALMA基线导致谱线流量被解析掉，这种差异可以得到大部分解释。 基于ALMA观测，我们确定每个源中超过75%的总[NII]谱线流量是由恒星形成产生的。我们利用ALMA恢复的[NII]谱线流量来限制氮氢丰度比、电离气体质量、氢电离光子产生率以及恒星形成率。 在SMMJ02399-0136中，我们发现除了尘埃星暴外，它还包含大量未被遮蔽的恒星形成（每年约1000个太阳质量），并认为SMMJ02399-0136可能类似于本地的天线星系（Arp 244）。总体而言，这些观测为研究这两个已知系统提供了新的视角，同时展示了Band-9 ALMA对高红移系统的观测能力及其面临的挑战。 显示英文摘要

摘要： We present Atacama Large Millimeter Array (ALMA) observations of two high-redshift systems (SMMJ02399-0136 and the Cloverleaf QSO) in their rest-frame 122 micron continuum (~650 GHz or ~450 micron on-sky) and [NII] 122 micron line emission. The continuum observations with a synthesized beam of ~0.25" resolve both sources and recover the expected flux. The Cloverleaf is resolved into a partial Einstein ring, while the SMMJ02399-0136 is unambiguously separated into two components; an AGN associated point source and an extend region at the location of a previously identified dusty starburst. We detect the [NII] line in both systems, though significantly weaker than our previous detections made with the 1st generation z(Redshift) and Early Universe Spectrometer. We show that this discrepancy is mostly explained if the line flux is resolved out due to significantly more extended emission and longer ALMA baselines than expected. Based on the ALMA observations we determine that greater than 75% of the total [NII] line flux in each source is produced via star formation. We use the [NII] line flux that is recovered by ALMA to constrain the N/H abundance, ionized gas mass, hydrogen ionizing photon rate, and star formation rate. In SMMJ02399-0136 we discover it contains a significant amount (~1000 solar masses per year) of unobscured star formation in addition to its dusty starburst and argue that SMMJ02399-0136 may be similar to the Antennae Galaxies (Arp 244) locally. In total these observations provide a new look at two well-studied systems while demonstrating the power and challenges of Band-9 ALMA observations of high-z systems.