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arXiv 1102.0526astro-ph.GA
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用AKARI全天巡天测量银河系行星状星云的中远红外测光

Mid and Far Infrared Photometry of Galactic Planetary Nebulae with the AKARI All Sky Survey

J. P. Phillips, R. A. Marquez-Lugo

摘要:

我们提供了857个银河系行星状星云(PNE)的中红外和远红外测光,使用来自AKARI全天巡天的数据。其中包括用红外照相机(IRC)获得的9和18 μm的通量,以及用远红外探测器(FIS)获得的65、90、140和160 μm的通量。值得注意的是,最年轻的PNe的红外光度与中心恒星的总光度相当,随后下降到~ 5102 L,其中D > 0.08 pc。这与PNE尘埃不透明度的演变,以及年轻和原始PNE的明显吸收是一致的。我们还注意到,虽然很少有证据表明,在以前的作者提出的红外/无线电通量比的演变。尘埃温度的下降与以前的研究中确定的相似,而Ly加热的水平小于谷物总能量预算的0.5。似乎有一个演变的红外过剩(IRE)的星云扩大,最大的值发生在最紧凑的PNe。

英文摘要:

We provide mid- and far-infrared photometry of 857 Galactic planetary nebulae (PNe) using data derived from the AKARI All-Sky Survey. These include fluxes at 9 and 18 μm obtained with the Infrared Camera (IRC), and at 65, 90, 140 and 160 μm using the far-Infrared Surveyor (FIS). It is noted that the IR luminosities of the youngest PNe are comparable to the total luminosities of the central stars, and subsequently decline to ~ 5102 L where D > 0.08 pc. This is consistent with an evolution of PNe dust opacities, and appreciable absorption in young and proto-PNe. We also note that whilst there is little evidence for the evolution in IR/radio flux ratios suggested by previous authors. The fall-off in dust temperatures is similar to that determined in previous studies, whilst levels of Ly heating are < 0.5 of the total energy budget of the grains. There appears to be an evolution in the infrared excess (IRE) as nebulae expand, with the largest values occurring in the most compact PNe.

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