VLT/near-infrared integral field spectrometer observations of molecular hydrogen lines in the knots of the planetary nebula NGC 7293 (the Helix Nebula)

@article{Matsuura2007VLTnearinfraredIF,
  title={VLT/near-infrared integral field spectrometer observations of molecular hydrogen lines in the knots of the planetary nebula NGC 7293 (the Helix Nebula)},
  author={M. Matsuura and A. Speck and M. Smith and A. Zijlstra and S. Viti and K. Lowe and M. Redman and C. Wareing and E. Lagadec and Nao and Japan Qub and UK Ucl and UK University of Hertfordshire National University of Galway and Galway},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2007},
  volume={382},
  pages={1447-1459}
}
Knots are commonly found in nearby planetary nebulae (PNe) and star-forming regions. Within PNe, knots are often found to be associated with the brightest parts of the nebulae and understanding the physics involved in knots may reveal the processes dominating in PNe. As one of the closest PNe, the Helix Nebula (NGC 7293) is an ideal target to study such small-scale (∼300 au) structures. We have obtained infrared integral spectroscopy of a comet-shaped knot in the Helix Nebula using the… Expand
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We present a deep and wide field-of-view (4' x 7') image of the planetary nebula (PN) NGC 7293 (the Helix Nebula) in the 2.12 {mu}m H{sub 2} v = 1 {yields} 0 S(1) line. The excellent seeing (0.''4)Expand
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We have conducted a combined observational and theoretical investigation of the ubiquitous knots in the Helix Nebula (NGC 7293). We have constructed a combined hydrodynamic + radiation model for theExpand
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