论文标题

鉴定在热分子芯中含有肽样键的益生元分子,G10.47+0.03

Identification of pre-biotic molecules containing Peptide-like bond in a hot molecular core, G10.47+0.03

论文作者

Gorai, Prasanta, Bhat, Bratati, Sil, Milan, Mondal, Suman K., Ghosh, Rana, Chakrabarti, Sandip K., Das, Ankan

论文摘要

在氢,氧和碳之后,氮是星际培养基中最活跃的物种之一(ISM)。氮轴承分子非常重要,因为它们积极参与了生物分子的形成。因此,必须在各种天体物理来源中寻找含氮物种,特别是在高质量恒星形成区域,在这些区域中,进化史相对较少了解。在本文中,我们报告了三个潜在的益生元分子的观察,即异氰酸(HNCO),甲酰胺(NH2CHO)和甲基异氰酸酯(CH3NCO),其中包含肽样键(-nh-c(-nh-c(-nh-c(= o))),在热分子核心中,G10.47+0.03(exeact)。除了鉴定这三个复杂的含氮物种外,我们还推测了它们在来源中的空间分布,并在这种情况下讨论了它们可能的地层途径。 LTE条件下的旋转图方法已被用于估计观察物种的激发温度和柱密度。马尔可夫链蒙特卡洛法用于获得G10的最佳物理参数以及某些物种的线性特性。我们还确定了在各种频率范围内观察到的不同连续体的氢柱密度和光学深度。最后,基于这些观察结果,我们构建了一个化学模型来解释观察结果。我们发现HNCO,NH2CHO和CH3NCO彼此化学联系。

After hydrogen, oxygen, and carbon, nitrogen is one of the most chemically active species in the interstellar medium (ISM). Nitrogen bearing molecules have great importance as they are actively involved in the formation of biomolecules. Therefore, it is essential to look for nitrogen-bearing species in various astrophysical sources, specifically around high-mass star-forming regions where the evolutionary history is comparatively poorly understood. In this paper, we report the observation of three potential pre-biotic molecules, namely, isocyanic acid (HNCO), formamide (NH2CHO), and methyl isocyanate (CH3NCO), which contain peptide-like bonds (-NH-C(=O)-) in a hot molecular core, G10.47+0.03 (hereafter, G10). Along with the identification of these three complex nitrogen-bearing species, we speculate their spatial distribution in the source and discuss their possible formation pathways under such conditions. The rotational diagram method under the LTE condition has been employed to estimate the excitation temperature and the column density of the observed species. Markov Chain Monte Carlo method was used to obtain the best suited physical parameters of G10 as well as line properties of some species. We also determined the hydrogen column density and the optical depth for different continuum observed in various frequency ranges. Finally, based on these observational results, we have constructed a chemical model to explain the observational findings. We found that HNCO, NH2CHO, and CH3NCO are chemically linked with each other.

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