The Evolution of Hetergeneous 'Clumpy Jets': A Parameter Study
| Autor: | Andrew J. Cunningham, Adam Frank, Ed Schroeder, Kristopher Yirak |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Physics
Jet (fluid) FOS: Physical sciences Velocity dispersion Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Parameter space 01 natural sciences 010305 fluids & plasmas Astrophysical jet Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Position (vector) 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Herbig–Haro object 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Beam (structure) Astrophysics::Galaxy Astrophysics Line (formation) |
| Popis: | We investigate the role discrete clumps embedded in an astrophysical jet play on the jet's morphology and line emission characteristics. By varying clumps' size, density, position, and velocity, we cover a range of parameter space motivated by observations of objects such as the Herbig Haro object HH~34. We here extend the results presented in Yirak et al. 2009, including how analysis of individual observations may lead to spurious sinusoidal variation whose parameters vary widely over time, owing chiefly to interacts between clumps. The goodness of the fits, while poor in all simulations, are best when clump-clump collisions are minimal. Our results indicate that a large velocity dispersion leads to a clump-clump collision-dominated flow which disrupts the jet beam. Finally, we present synthetic emission images of H-$\alpha$ and [SII] and note an excess of [SII] emission along the jet length as compared to observations. This suggests that observed beams undergo earlier processing, if they are present at all. Comment: 18 pages, 7 figures. Submitted to the Astrophysical Journal |
| Databáze: | OpenAIRE |
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