Chemical complexity in NGC 1068

Chemical complexity in NGC 1068
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NGC 1068 中的化学复杂性

DOI:
10.1088/1742-6596/372/1/012039
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发表时间:
2012
期刊:
Conference Series
影响因子:
--
通讯作者:
Aladro R
Aladro R
中科院分区:
--
文献类型:
--
作者:
Aladro R

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我们的目标是研究NGC 1068的环核分子气体的化学组成,并将其与星暴星系M 82和NGC 253的环核分子气体进行比较。利用IRAM-30 m望远镜,在86.2 ~ 115.6GHz之间观测到了NGC 1068的内部2kpc。我们确定了35个光谱特征,对应于24种不同的分子种类。其中,HC 3 N、SO、N2 H+、CH 3 CN、NS、13 CN、HN 13 C为NGC 1068中首次检测到。假设局部热力学平衡(LTE),我们计算了检测到的分子的柱密度,以及一些未检测到的物种的柱密度的上限。通过比较NGC 1068、M 82和NGC 253的化学成分,我们发现除了X射线外,冲击波也决定了NGC 1068的化学成分。我们提出CH 3CCH和HC 3 N的柱密度比作为星暴和活动星系核环境在环核星际介质中的印记的一个主要指标。M 82的这个比值至少是NGC 1068的64倍,NGC 253的这个比值至少是NGC 1068的4倍。最后,我们使用UCL_CHEM和UCL_PDR化学代码来约束物种的起源,以及测试紫外辐射场和宇宙射线对观测到的丰度的影响。
We aimed to study the chemistry of the circumnuclear molecular gas of NGC 1068, and to compare it with those of the starburst galaxies M 82 and NGC 253. Using the IRAM-30 m telescope, we observed the inner 2kpc of NGC 1068 between 86.2 GHz and 115.6 GHz. We identified 35 spectral features, corresponding to 24 different molecular species. Among them, HC 3 N, SO, N 2 H+, CH 3 CN, NS, 13 CN, and HN 13 C are detected for the first time in NGC 1068. Assuming local thermodynamic equilibrium (LTE), we calculated the column densities of the detected molecules, as well as the upper limits to the column densities of some undetected species. The comparison among the chemistries of NGC 1068, M 82, and NGC 253, suggests that, apart from X-rays, shocks also determine the chemistry of NGC 1068. We propose the column density ratio between CH 3 CCH and HC 3 N as a prime indicator of the imprints of starburst and AGN environments in the circumnuclear interstellar medium. This ratio is, at least, 64 times larger in M 82 than in NGC 1068, and, at least, 4 times larger in NGC 253 than in NGC, 1068. Finally, we used the UCL_CHEM and UCL_PDR chemical codes to constrain the origin of the species, as well as to test the influence of UV radiation fields and cosmic rays on the observed abundances.
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影响因子: 4.8
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发表时间: 2011-01-01
影响因子: 6.5
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NGC 1068 中的分子云环
DOI: --
发表时间: 1987
期刊:
影响因子: --
作者:
S. Myers;N. Scoville
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