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arXiv 1508.01740astro-ph.GA
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双极行星状星云中H2的激发机制

The excitation mechanism of H2 in bipolar planetary nebulae

R. A. Marquez-Lugo, Martin A. Guerrero, Gerardo Ramos-Larios, Luis F Miranda

摘要:

我们提出了近红外K波段中等色散空间分辨光谱观测的有限样本的双极行星状星云(PNE)。光谱已被用来确定使用标准线比诊断的H2分子的激发机制。H2分子在具有宽赤道环的双极PNe中主要是冲击激发的,而具有窄赤道腰的双极PNe在其核心处呈现UV激发(例如,Hb 12)或在其双极叶(例如,M1-92)。发现双极PNe中的激波激发与H2 1-0 S(1)线的发射有关。我们已经扩大了这项调查,以其他PNE与可用的近红外光谱观测。这证实了具有赤道环的双极PNe在H2中平均比在Brγ中亮,并显示出主导的激波激发。

英文摘要:

We present near-IR K-band intermediate-dispersion spatially-resolved spectroscopic observations of a limited sample of bipolar planetary nebulae (PNe). The spectra have been used to determine the excitation mechanism of the H2 molecule using standard line ratios diagnostics. The H2 molecule is predominantly shock-excited in bipolar PNe with broad equatorial rings, whereas bipolar PNe with narrow equatorial waists present either UV excitation at their cores (e.g., Hb 12) or shock-excitation at their bipolar lobes (e.g., M1-92). The shock-excitation among bipolar PNe with ring is found to be correlated with emission in the H2 1-0 S(1) line brighter than Brγ. We have extended this investigation to other PNe with available near-IR spectroscopic observations. This confirms that bipolar PNe with equatorial rings are in average brighter in H2 than in Brγ and show dominant shock excitation.

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