NH2 and Its Parent Molecule in the Inner Coma of Comet Hyakutake (C/1996 B2)
NH2 and Its Parent Molecule in the Inner Coma of Comet Hyakutake (C/1996 B2)
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百武彗星内彗发中的 NH2 及其母分子 (C/1996 B2)
DOI：
10.1086/305318
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Watanabe
中科院分区：
文献类型：
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作者：
H. Kawakita;J. Watanabe
百武彗星（C/1996 B2）的光谱观测是在碧成天文台进行的。所获得的光谱覆盖5800至7300 Å波长，并包括一些NH2波段的几个发射，即（0,7,0），（0,8,0）和（0,9,0）波段。百武彗星是在离地球相当近的时候被观测到的；彗星的地心距离为Δ = 0.113 AU。在足够的空间分辨率下获得了核附近内彗发的表面亮度分布。分子间的碰撞在靠近原子核的区域（原子核距离小于103千米）是很明显的。本研究采用随机游走模型，考虑分子间的碰撞，研究NH2的母体分子。有可能检验少数几个NH2母分子的候选分子是否可以解释观测到的NH2空间分布。我们的模拟结果支持了NH3最有可能是NH2的母体分子这一事实。
Spectroscopic observations of comet Hyakutake (C/1996 B2) in the visible region was performed at Bisei Astronomical Observatory. The obtained spectrum covers the wavelengths from 5800 to 7300 Å and includes several emissions of some NH2 bands, i.e., the (0, 7, 0), (0, 8, 0), and (0, 9, 0) bands. Comet Hyakutake was observed when it was fairly close to the Earth; the geocentric distance of the comet was Δ = 0.113 AU. The surface brightness profile of the inner coma in the vicinity of the nucleus was obtained at the sufficient spatial resolution. The collisions between the molecules are conspicuous in the region near the nucleus (where the nucleocentric distance is less than about 103 km). The random walk model, considering the collisions between molecules, is used to research the parent molecule of NH2 in this study. It is possible to examine whether each of the few candidates for the parent molecule of NH2 can explain the observed NH2 spatial profile. The result of our simulation supports the fact that NH3 is most likely to be the parent molecule of NH2.