寻找星际尿素的多望远镜活动的观测结果[（NH $_2$）$_2$ CO]
Observational Results of a Multi-Telescope Campaign in Search of Interstellar Urea [(NH$_2$)$_2$CO]
摘要：
在本文中，我们提出了对Sgr B2（N-LMH）区域观测到的气相尿素[（NH $_2$）$_2$ CO]的观测搜索结果。我们显示的数据涵盖尿素转换从$\sim$ 100 GHz到250 GHz的五个不同的观测设施：BIMA，CARMA，NRAO 12米望远镜，IRAM 30米望远镜，和SEST。结果表明，归因于尿素的功能，可以复制在整个观察到的带宽和所有设施的最佳拟合柱密度，温度和源的大小参数之间的观察变化小于2的因素，仅仅通过调整望远镜的具体参数。干涉观测表明，这些过渡所产生的排放是空间和紧凑的，与衍生的源的大小和排放从一个单一的物种。尽管有这种证据，但（NH $_2$）$_2$ CO和Sgr B2（N）的光谱复杂性使得该分子的确定性鉴定具有挑战性。我们目前的观测光谱，实验室数据和模型，并讨论了我们的结果的背景下，可能的分子检测尿素。
英文摘要：
In this paper, we present the results of an observational search for gas phase urea [(NH$_2$)$_2$CO] observed towards the Sgr B2(N-LMH) region. We show data covering urea transitions from $\sim$100 GHz to 250 GHz from five different observational facilities: BIMA, CARMA, the NRAO 12 m telescope, the IRAM 30 m telescope, and SEST. The results show that the features ascribed to urea can be reproduced across the entire observed bandwidth and all facilities by best fit column density, temperature, and source size parameters which vary by less than a factor of 2 between observations merely by adjusting for telescope-specific parameters. Interferometric observations show that the emission arising from these transitions is cospatial and compact, consistent with the derived source sizes and emission from a single species. Despite this evidence, the spectral complexity, both of (NH$_2$)$_2$CO and of Sgr B2(N), makes the definitive identification of this molecule challenging. We present observational spectra, laboratory data, and models, and discuss our results in the context of a possible molecular detection of urea.
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