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INFRARED OBSERVATIONS OF THE HELIX PLANETARY NEBULA

机译：螺旋行星状星云的红外观测

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摘要

We have mapped the Helix (NGC 7293) planetary nebula (PN) with the IRAC instrument on the Spitzer Space Telescope. The Helix is one of the closest bright PNs and therefore provides an opportunity to resolve the small-scale structure in the nebula. The emission from this PN in the 5.8 and 8 μm IRAC bands is dominated by the pure rotational lines of molecular hydrogen, with a smaller contribution from forbidden line emission such as [Ar Ⅲ] in the ionized region. The IRAC images resolve the "cometary knots," which have been previously studied in this PN. The "tails" of the knots and the radial rays extending into the outer regions of the PN are seen in emission in the IRAC bands. IRS spectra on the main ring and the emission in the IRAC bands are consistent with shock-excited H_2 models, with a small (～10%) component from photodissociation regions. In the northeast arc, the H_2 emission is located in a shell outside the Hα emission.
机译：我们已使用Spitzer空间望远镜上的IRAC仪器绘制了螺旋（NGC 7293）行星状星云（PN）。螺旋线是最接近的明亮PN之一，因此为解析星云中的小规模结构提供了机会。在5.8和8μmIRAC波段中，此PN的发射主要由分子氢的纯旋转线主导，而在离子化区域中，诸如[ArⅢ]之类的禁线发射的贡献较小。 IRAC图像解决了该PN中先前研究的“彗星结”。在IRAC波段的发射中可以看到结的“尾巴”和延伸到PN外部区域的径向射线。主环上的IRS光谱和IRAC波段的发射与激波激发的H_2模型一致，光解离区的成分很小（〜10％）。在东北弧，H_2发射位于Hα发射之外的壳中。

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