A Multi-wavelength-based Method to de-project Gas and Dust Distributions of several Planetary Nebulae Andrei Linţu, Hendrik Lensch, Ting-Hui Lee, Sascha El-Abed, Hans-Peter Seidel

Andrei Linţu, Hendrik Lensch, Ting-Hui Lee, Sascha El-Abed, and Hans-Peter Seidel: "A Multi-wavelength-based Method to de-project Gas and Dust Distributions of several Planetary Nebulae", in Proc. Asymmetrical Planetary Nebulae (APN), June 2007. [pdf] [bib]

Abstract

We describe a de-projection method to recover the 3D distribution of the ionized gas and dust component in planetary nebulae. Based on observations in the optical and radio regime, we propose an analysis-by-synthesis approach to obtain physically consistent spatial distributions that take extinction as well as scattering into account. As input we require two calibrated data sets of the same planetary nebula, a radio free-free emission map and a hydrogen recombination line map. From the radio free-free emission map, we first recover the density distribution of the ionized gas component using non-linear optimization while enforcing symmetry constraints. In a second step, we compare the recovered gas distribution to the input hydrogen recombination line map and optimize for the density distribution of the dust component considering extinction as well as scattering.

TU Braunschweig - Fakultät für Mathematik und Informatik - Computer Graphics - Publications - A Multi-wavelength-based Method to de-project Gas and Dust Distributions of several Planetary Nebulae