Infrared observations of the helix planetary nebula

@article{Hora2006InfraredOO,
  title={Infrared observations of the helix planetary nebula},
  author={J. Hora and W. Latter and Howard A. Smith and M. Marengo},
  journal={The Astrophysical Journal},
  year={2006},
  volume={652},
  pages={426-441}
}
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… Expand
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Molecular hydrogen emission is commonly observed in planetary nebulae. Images taken in infrared H2 emission lines show that at least part of the molecular emission is produced inside the ionizedExpand
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