Titlebook: Diffuse Matter from Star Forming Regions to Active Galaxies; A Volume Honouring J T.W. HARTQUIST,J.M. PITTARD,S.A.E.G. FALLE Book 2007 Spri

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Delia Teresa Sponza,Cansu Vural,Gokce GüneyFor the purposes of this chapter I have defined Ultra High-Energy Cosmic Rays (UHECRs) as those cosmic particles or photons that have energies above 3 ×10. eV.

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Numerical Simulations of Star FormationLike most branches of theoretical astrophysics, progress in the theory of star formation requires numerical simulations, even though there are people like John Dyson who can still get amazing results without them.

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Dusty Plasma Effects in Star Forming RegionsIn his chapter on star formation, Sam Falle has demonstrated the importance of hydromagnetic effects in star formation. In his, David Williams has described some of the chemical consequences of the presence of dust in star forming regions.

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Spectropolarimetry and the Study of Circumstellar DisksThe disk accretion paradigm has proven to be extremely successful as an explanation of the formation of low mass stars. Due to angular momentum considerations, it is now commonly accepted that during gravitational collapse a disk forms around a newly born star.

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How to Move Ionized Gas: An Introduction to the Dynamics of HII RegionsHII regions are volumes of gas surrounding high-mass stars that are ionized and heated by the stellar ultraviolet radiation. This ionization and heating significantly raises the thermal pressure of the gas, which is the principal driver of the dynamics of all but the very smallest and very largest HII regions.

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Herbig-Haro Jets from Young StarsIt is over half a century since the independent discovery by George Herbig (Herbig 1950, 1951) and Guillermo Haro (Haro 1952, 1953) of the nebulous patches in the sky that bear their names. It was clear, right from the very beginning, that they had something to do with star formation.

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