This book provides a rich introduction to the dynamics of galaxies at the graduate level progressing from basic observations concepts and techniques to active areas of research enough mathematics is presented to empower the reader but the emphasis is on imparting a physical understanding of underlying principles and research frontiers. Review of the first editionthis book is a joy to read it connects the internal dynamics of galaxies to the physics of plasmas and the theory of wave in fluids with a delight in the universality of the laws of mechanics an endearing characteristic is its lack of dogmatism both in the theory of spiral structure and over dark matter . Physicists analyze rotational dynamics of galaxies and influence of the photon mass could the effect of photon mass on the gaseous components in galaxies be as strong as that of dark matter. From the summary and conclusions this paper considers a possible role of the photon mass inthe rotational dynamics of galaxies the basic mechanism is related to the additional centripetal force . Our understanding of galaxies has advanced significantly in recent years new observations from ground and space based telescopes the discovery of dark matter and powerful computer simulations have been instrumental in this this textbook provides graduate students with a complete and thorough introduction to galactic dynamics the first two parts of the book define the astrophysical
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