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  • Van de Steene, G. C. (author)

Herschel imaging of the dust in the Helix nebula (NGC 7293)

  • Article/chapterEnglish2015

Publisher, publication year, extent ...

  • 2015-02-06
  • EDP Sciences,2015
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-115939
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-115939URI
  • https://doi.org/10.1051/0004-6361/201424189DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • AuthorCount:22;
  • Aims. In our series of papers presenting the Herschel imaging of evolved planetary nebulae, we present images of the dust distribution in the Helix nebula (NGC 7293). Methods. Images at 70, 160, 250, 350, and 500 mu m were obtained with the PACS and SPIRE instruments on board the Herschel satellite. Results. The broadband maps show the dust distribution over the main Helix nebula to be u npy and predominantly present in the barrel wall. We determined the spectral energy distribution of the main nebula in a consistent way using Herschel. IRAS. and Planck flux values, The emissivity index of beta = 0.99 +/- 0.09, in combination with the carbon rich molecular chemistry of the nebula, indicates that the dust consists mainly of amorphous carbon. The dust excess emission from the central star disk is detected at 70 pm and the flux measurement agrees with previous measurement. We present the temperature and dust column density maps. The total dust mass across the Helix nebula (without its halo) is determined to be 3.5 x 10(-3) M-circle dot at a distance of 216 pc. The temperature map shows dust temperatures between 22 K and 42 K, which is similar to the kinetic temperature of the molecular gas, confirming that the dust and gas co exist in high density clumps. Archived images are used to compare the location of the dust emission in the far infrared (Herschel) with the ionized (GALEX and H-beta) and molecular (H-2) component. The different emission components are consistent with the Helix consisting of a thick walled barrel-like structure inclined to the line of sight. The radiation field decreases rapidly through the barrel wall.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • van Hoof, P. A. M. (author)
  • Exter, K. M. (author)
  • Barlow, M. J. (author)
  • Cernicharo, J. (author)
  • Etxaluze, M. (author)
  • Gear, W. K. (author)
  • Goicoechea, J. R. (author)
  • Gomez, H. L. (author)
  • Groenewegen, M. A. T. (author)
  • Hargrave, P. C. (author)
  • Ivison, R. J. (author)
  • Leeks, S. J. (author)
  • Lim, T. L. (author)
  • Matsuura, M. (author)
  • Olofsson, GöranStockholms universitet,Institutionen för astronomi(Swepub:su)olofsson (author)
  • Polehampton, E. T. (author)
  • Swinyard, B. M. (author)
  • Ueta, T. (author)
  • Van Winckel, H. (author)
  • Waelkens, C. (author)
  • Wesson, R. (author)
  • Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences5740004-63611432-0746

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