OBSERVATIONAL RESULTS OF A MULTI-TELESCOPE CAMPAIGN IN SEARCH OF INTERSTELLAR UREA [(NH2)2CO]
OBSERVATIONAL RESULTS OF A MULTI-TELESCOPE CAMPAIGN IN SEARCH OF INTERSTELLAR UREA [(NH2)2CO]
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多望远镜搜寻星际尿素 [(NH2)2CO] 活动的观测结果
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
J. Hollis
中科院分区：
文献类型：
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作者：
A. Remijan;L. Snyder;B. McGuire;H. Kuo;L. Looney;D. Friedel;G. Golubiatnikov;F. Lovas;V. Ilyushin;E. Alekseev;S. Dyubko;B. McCall;J. Hollis
在本文中，我们提出了一个观测搜索的结果，气相尿素[（NH 2）2CO]观察到的Sgr B2（N-LMH）区域。我们展示了五个不同观测设施的尿素跃迁数据：伯克利-伊利诺伊-马里兰协会（比马）阵列，毫米波天文学研究组合阵列（CARMA），NRAO 12米望远镜，IRAM 30米望远镜和瑞典ESO亚毫米波望远镜（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变化小于两个因素的观察，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。尽管有这一证据，但（NH 2）2CO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。
In this paper, we present the results of an observational search for gas phase urea [(NH2)2CO] observed toward the Sgr B2(N-LMH) region. We show data covering urea transitions from ∼100 GHz to 250 GHz from five different observational facilities: the Berkeley–Illinois–Maryland-Association (BIMA) Array, the Combined Array for Research in Millimeter-wave Astronomy (CARMA), the NRAO 12 m telescope, the IRAM 30 m telescope, and the Swedish-ESO Submillimeter Telescope (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 two 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 of both (NH2)2CO 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.