Shadows behind Neutral Clumps in Photoionized Regions

Details Shadows behind Neutral Clumps in Photoionized Regions Shadows behind Neutral Clumps in Photoionized Regions

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...502..695c&link_type=abstract

Astrophysical Journal v.502, p.695

Astronomy and Astrophysics

Astronomy

59

Hydrodynamics, Ism: General, Ism: Individual Name: Helix Nebula, Methods: Numerical, Shock Waves, Stars: Formation

Scientific paper

Shadows behind neutral clumps in photoionized regions can have a neutral core surrounded by gas that is photoionized by the diffuse flux produced by the nebula. We present a simple analytic model describing the configuration of such shadows. We also present numerical gasdynamic simulations of the relaxation to the final, steady state. These models have clear applications (e.g., to the cometary knots in the Helix Nebula) but can also be applied in other astrophysical contexts.

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