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Search: WFRF:(Tielens Aggm) > (2013)

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1.
  • Ueta, T., et al. (author)
  • Planetary Nebula dust haloes revealed by Herschel
  • 2013
  • In: Proceedings of Science. - Trieste, Italy : Sissa Medialab. - 1824-8039.
  • Conference paper (peer-reviewed)abstract
    • Herschel Planetary Nebula Survey (HerPlaNS) is a far-IR imaging and spectroscopic survey of planetary nebulae, performedwith the Herschel Space Observatory, aiming at (1) establishing the spatially-resolved far-IR characteristics of the target nebulae and (2) understanding the energetics and shaping history of the circumstellar nebulae. Below we briefly demonstrate the breadth and depth of the HerPlaNS data set using one of the targets, NGC6781, as an example, and explore expectations in the era of SPICA, the next-generation far-IR mission.
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2.
  • Wallström, Sofia, 1988, et al. (author)
  • CO rotational line emission from a dense knot in Cassiopeia A: Evidence for active post-reverse-shock chemistry
  • 2013
  • In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 558:L2
  • Journal article (peer-reviewed)abstract
    • We report a Herschel detection of high-J rotational CO lines from a dense knot in the supernova remnant Cas A. Based on a combined analysis of these rotational lines and previously observed ro-vibrational CO lines, we find the gas to be warm (two components at ~400 and 2000 K) and dense (1e6−7 cm-3), with a CO column density of ~5e17 cm-2. This, along with the broad line widths (~400 km/s), suggests that the CO emission originates in the post-shock region of the reverse shock. As the passage of the reverse shock dissociates any existing molecules, the CO has most likely reformed in the past several years in the post-shock gas. The CO cooling time is similar to the CO formation time, therefore we discuss possible heating sources (UV photons from the shock front, X-rays, electron conduction) that may maintain the high column density of warm CO.
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