Modelling of aspherical nebulae. I. A quick pseudo-3D photoionization code

Details Modelling of aspherical nebulae. I. A quick pseudo-3D photoionization code Modelling of aspherical nebulae. I. A quick pseudo-3D photoionization code

2005-03-03

arxiv.org/abs/astro-ph/0503082v1

Mon.Not.Roy.Astron.Soc. 360 (2005) 499-508

Astronomy and Astrophysics

Astrophysics

11 pages, 19 figures (mainly in color). Accepted by MNRAS

Scientific paper

10.1111/j.1365-2966.2005.09049.x

We describe a pseudo-3D photoionization code, NEBU_3D and its associated visualization tool, VIS_NEB3D, which are able to easily and rapidly treat a wide variety of nebular geometries, by combining models obtained with a 1D photoionization code. The only requirement for the code to work is that the ionization source is uniqu e and not extended. It is applicable as long as the diffuse ionizing radiation f ield is not dominant and strongly inhomogeneous. As examples of the capabilities of these new tools, we consider two very differ ent theoretical cases. One is that of a high excitation planetary nebula that ha s an ellipsoidal shape with two polar density knots. The other one is that of a blister HII region, for which we have also constructed a spherical model (the sp herical impostor) which has exactly the same Hbeta surface brightness distrib ution as the blister model and the same ionizing star. These two examples warn against preconceived ideas when interpreting spectroscop ic and imaging data of HII regions and planetary nebulae. The tools NEBU_3D and VIS_NEB3D, which will be made publicly available in the future, should facilitat e the performance of numerical experiments, to yield a better understanding of t he physics of aspherical ionized nebulae.

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