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Author : Louis Martinet
Release : 1994
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Evidences of Secular Dynamical Evolution in Disk Galaxies by : Louis Martinet
Download or read book Evidences of Secular Dynamical Evolution in Disk Galaxies written by Louis Martinet. This book was released on 1994. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xiaolei Zhang
Release : 2017-09-01
Genre :
Kind : eBook
Book Rating : 199/5 ( reviews)
Book Synopsis Dynamical Evolution of Galaxies by : Xiaolei Zhang
Download or read book Dynamical Evolution of Galaxies written by Xiaolei Zhang. This book was released on 2017-09-01. Available in PDF, EPUB and Kindle. Book excerpt: This is a cross-disciplinary work that has a variety of connections with fundamental aspects of physics. It presents analytical, numerical, and observational evidence to establish secular dynamical evolution of galaxies. The cutting-edge results make it a valuable reference for researchers in astronomy, astrophysics, complexity theory, many-body physics, cosmology, and numerical methods in physics.
Author : Frank Hohl
Release : 1970
Genre : Galaxies
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Dynamical Evolution of Disk Galaxies by : Frank Hohl
Download or read book Dynamical Evolution of Disk Galaxies written by Frank Hohl. This book was released on 1970. Available in PDF, EPUB and Kindle. Book excerpt: A computer model for isolated disks of stars is presented and is used to study the self-consistent motion of large numbers of point masses as they move in the plane of the galactic disk. The Control Data 6600 computer system at the Langley Research Center was used to integrate the equations of motion for each star for systems containing from 50,000 to 200,000 stars. Any initially cold balanced disk was found to be violently unstable. A sufficient amount of velocity dispersion will stabilize all small-scale disturbances. However, most disks investigated were found to be unstable against slowly growing long-wavelength modes, and after about two rotations the disks tended to assume a bar-shaped structure. It was also found that the final mass distribution for most disks could be closely approximated by an exponential variation irrespective of the initial mass distribution. To study the development of spiral structure, the model was modified to include a fixed central force similar to that in the Schmidt model of the Galaxy. The mass of the stars in the disk was taken to be from 5 to 50 percent of the total mass of the Galaxy. The evolution of a number of initial distributions of stars was investigated. The results of the calculation gave a velocity dispersion for the disk stars which was about 50 percent larger than the value of about 30 km/sec found from observation of stars in the solar neighborhood. For some of the disks investigated, a pronounced spiral structure remained even after 8.5 rotations.
Author : Xiaolei Zhang
Release : 2017-12-04
Genre : Science
Kind : eBook
Book Rating : 445/5 ( reviews)
Book Synopsis Dynamical Evolution of Galaxies by : Xiaolei Zhang
Download or read book Dynamical Evolution of Galaxies written by Xiaolei Zhang. This book was released on 2017-12-04. Available in PDF, EPUB and Kindle. Book excerpt: This research monograph presents a new dynamical framework for the study of secular morphological evolution of galaxies along the Hubble sequence. Classical approaches based on Boltzmann’s kinetic equation, as well as on its moment-equation descendants the Euler and Navier-Stokes fluid equations, are inadequate for treating the maintenance and long-term evolution of systems containing self-organized structures such as galactic density-wave modes. A global and synthetic approach, incorporating correlated fluctuations of the constituent particles during a nonequilibrium phase transition, is adopted to supplement the continuum treatment. The cutting-edge research combining analytical, N-body simulational, and observational aspects, as well as the fundamental-physics connections it provides, make this work a valuable reference for researchers and graduate students in astronomy, astrophysics, cosmology, many-body physics, complexity theory, and other related fields. Contents Dynamical Drivers of Galaxy Evolution N-Body Simulations of Galaxy Evolution Astrophysical Implications of the Dynamical Theory Putting It All Together Concluding Remarks Appendix: Relation to Kinetics and Fluid Mechanics
Author : Jesús Falcón-Barroso
Release : 2012
Genre : Science
Kind : eBook
Book Rating : 279/5 ( reviews)
Book Synopsis Secular Evolution of Galaxies by : Jesús Falcón-Barroso
Download or read book Secular Evolution of Galaxies written by Jesús Falcón-Barroso. This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt: The formation and evolution of galaxies is one of the most important topics in modern astrophysics. Secular evolution refers to the relatively slow dynamical evolution due to internal processes induced by a galaxy's spiral arms, bars, galactic winds, black holes and dark matter haloes. It plays an important role in the evolution of spiral galaxies with major consequences for galactic bulges, the transfer of angular momentum, and the distribution of a galaxy's constituent stars, gas and dust. This internal evolution is in turn the key to understanding and testing cosmological models of galaxy formation and evolution. Based on the twenty-third Winter School of the Canary Islands Institute of Astrophysics, this volume presents reviews from nine world-renowned experts on the observational and theoretical research into secular processes, and what these processes can tell us about the structure and formation of galaxies. The volume provides a firm grounding for graduate students and early career researchers working on galactic dynamics and galaxy evolution.
