Physical Processes in the Interstellar Medium
Physical Processes in the Interstellar Medium discusses the nature of interstellar matter, with a strong emphasis on basic physical principles, and summarizes the present state of knowledge about the interstellar medium by providing the latest observational data. Physics and chemistry of the interstellar medium are treated, with frequent references to observational results. The overall equilibrium and dynamical state of the interstellar gas are described, with discussions of explosions produced by star birth and star death and the initial phases of cloud collapse leading to star formation.
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Elastic Collisions and Kinetic Equilibrium
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absorption assumed atoms average becomes clouds coefficient collisions computed consider constant corresponding cosmic rays curve decrease defined denote density depends detailed determined diffuse direction discussed distance distribution dust effective electron emission energy equal equation equilibrium Evidently exceeds excitation extinction factor field force fraction frequency front function galactic given gives grains greater H atoms H II regions heating Hence hydrogen ignored important increases indicate initial integral interstellar ionization ions kinetic less limit line of sight lower magnetic field mass mean measured molecules neutral observed obtained optical particles photons physical plane polarization positive present pressure probability processes produced quantity radiation radiative radius range ratio recombination relatively respectively result rotational shock shown stars stellar Table temperature tion transitions ultraviolet unity varies velocity wavelength