Physical Conditions of the Shocked Regions of Planetary Nebulae

Riera, A.; Raga, A. C.; Mellema, Garrelt; Esquivel, A.; Velázquez, P. F.

doi:10.1007/978-3-642-00576-3_88

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2018

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“…Thus, FLIERs/LISs 'exceptional' ionization properties seem to be associated to either shock regions or ionization fronts [15]. However, 'pure' shock models are not able to explain the entire observed properties of FLIERs [20]. By means of a series of numerical simulations, in [21] the authors predict the emission line spectrum of knots (low-ionization structures), which agrees approximately with observed spectra when shown in two-line ratio diagnostic diagrams.…”

Section: Introductionmentioning

confidence: 72%

Analysis of Multiple Shell Planetary Nebulae Based on HST/WFPC2 Extended 2D Diagnostic Diagrams

Barría

Kimeswenger

2018

Galaxies

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The investigation of gaseous nebulae, emitting in forbidden lines, is often based extensively on diagnostic diagrams. The special physics of these lines often allows for disentangling with a few line ratios normally coupled thermodynamic parameters like electron temperature, density and properties of the photo-ionizing radiation field. Diagnostic diagrams are usually used for the investigation of planetary nebulae as a total. We investigated the extension of such integrated properties towards spatially resolved 2D diagnostics, using Hubble Space Telescope/Wide Field Planetary Camera 2 (HST/WFPC2) narrow band images. For this purpose, we also derived a method to isolate pure Hα emission from the [N ii] contamination as normally suffering in the F656N HST/WFPC2 filter.

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Section: Introductionmentioning

confidence: 72%