Download or read book The Structure and Dynamics of the Spiral Galaxy NGC 4736 written by Robert Andrew Schommer and published by . This book was released on 1977 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spiral Structure in Galaxies written by Marc S Seigar and published by Morgan & Claypool Publishers. This book was released on 2017-06-29 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: How does it happen that billions of stars can cooperate to produce the beautiful spirals that characterize so many galaxies, including ours? This book reviews the history behind the discovery of spiral galaxies and the problems faced when trying to explain the existence of spiral structure within them. In the book, subjects such as galaxy morphology and structure are addressed as well as several models for spiral structure. The evidence in favor or against these models is discussed. The book ends by discussing how spiral structure can be used as a proxy for other properties of spiral galaxies, such as their dark matter content and their central supermassive black hole masses, and why this is important.

Download or read book The Structure and Dynamics of Clusters and the HI Content of Spiral Galaxies written by Maria Teresa Sanchis Estruch and published by . This book was released on 2003 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computer Experiments on the Structure and Dynamics of Spiral Galaxies written by Frank Hohl and published by . This book was released on 1972 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The evolution of an initially balanced rotating disk of stars with an initial velocity dispersion given by Toomre's local criterion was investigated by means of a computer model for isolated disks of stars. It was found that the disk is unstable against very large scale modes. A stable axisymmetric disk with a velocity dispersion much larger than that given by Toomre's criterion was generated. The final mass distribution for the disk gives a high density central core and a disk population of stars that is closely approximated by an exponential variation. Various methods and rates of cooling the hot axisymmetric disks were investigated. It was found that the cooling resulted in the development of two-arm spiral structures which persisted as long as cooling continued. An experiment was performed to induce spiral structure in a galaxy by means of the close passage of a companion galaxy. Parameters similar to those expected for M51 and its companion were used. It was found that because of the high velocity dispersion of the disturbed disk galaxy, only a weak two-arm spiral structure appeared. The evolution of a uniformly rotating disk galaxy which is a stationary solution of the collisionless Boltzmann equation was investigated for various values of the initial rms velocity dispersion. It was found that the disk becomes stable at a value of the velocity dispersion predicted by theory.

Download or read book The Formation and Dynamics of Galaxies written by J.R. Shakeshaft and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of IAU Symposium No. 58 held in Canberra, Australia, August 12-15, 1973

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book The Structure and Dynamics of the Galaxy written by International Astronomical Union. Commission 33 and published by . This book was released on 1967 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic Fields in Galaxies written by F. Krause and published by CRC Press. This book was released on 1990 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the proceedings of the Workshop on Magnetic Fields in Galaxies, which was held in Potsdam (GDR) in the autumn of 1988.

Download or read book Structures and Dynamics of Ngc 3359 written by Veera Boonyasait and published by . This book was released on 2003 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Dynamics and Large Scale Structure of Spiral Galaxies written by Frank Hsia-San Shu and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Cambridge Photographic Atlas of Galaxies written by Michael König and published by Cambridge University Press. This book was released on 2017-09-07 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Galaxies - the Milky Way's siblings - offer a surprising variety of forms and colours. Displaying symmetrical spiral arms, glowing red nebulae or diffuse halos, even the image of a galaxy can reveal much about its construction. All galaxies consist of gas, dust and stars, but the effects of gravity, dark matter and the interaction of star formation and stellar explosions all influence their appearances. This volume showcases more than 250 of the most beautiful galaxies within an amateur's reach and uses them to explain current astrophysical research. It features fantastic photographs, unique insights into our knowledge, tips on astrophotography and essential facts and figures based on the latest science. From the Andromeda Galaxy to galaxy clusters and gravitational lenses, the nature of galaxies is revealed through these stunning amateur photographs. This well illustrated reference atlas deserves a place on the bookshelves of astronomical imagers, observers and armchair enthusiasts.

Download or read book Stellar Dynamics in the Spiral Galaxy NGC 157 written by Kenneth Robinson and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamics of spiral galaxies written by L. Weliachew and published by . This book was released on 1975 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atlas of the Messier Objects written by Ronald Stoyan and published by Cambridge University Press. This book was released on 2024-03-28 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first edition of this stunning reference atlas was hailed as the most comprehensive, detailed, and beautiful account of the Messier objects then available. The second edition of the Atlas continues this trend, with thoroughly updated astrophysical, historical, and observational information and new large-scale color photos for every object.

Download or read book Spiral Structure in Galaxies written by Giuseppe Bertin and published by MIT Press. This book was released on 1996 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: How does it happen that billions of stars can cooperate to produce the beautiful spirals that characterize so many galaxies, including ours? This book presents a theory of spiral structure that has been developed over the past three decades under the continuous stimulus of new observational studies. The theory unfolds in a way that can be grasped by any reader with an undergraduate science background who is interested in astronomy, as well as by graduate students and scientists actively involved in astronomy or related subjects who want to see the "backbone" and the physical content of the theory. The foundations of this theoretical framework were laid in the early 1960s, following the pioneering work of B. Lindblad. C. C. Lin had already contributed significantly to the field of fluid mechanics when he turned his attention to spiral structures, and he has focused on the problem ever since. Giuseppe Bertin joined this research effort when he first visited at MIT in 1975, bringing to the project knowledge from his work on elliptical galaxies and plasma astrophysics. Together, Bertin and Lin have contributed to the exciting developments on spiral structure of the last few decades, working closely with many observers and other theorists. In this book they describe the density-wave theory with the goal of making the key concepts and astrophysical implications explicit and accessible. The essence of the solution Bertin and Lin present is that the spirals are wave rather than material phenomena and generally trace intrinsic characteristics of the individual galaxies. The book is in three parts--Physical Concepts, Observational Studies, and Dynamical Mechanisms--with most of the technical details confined to the last part.

Download or read book Bulges of Spiral Galaxies written by Bhasker K. Moorthy and published by . This book was released on 2006 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Observations and Modeling of the Gas Dynamics of the Barred Spiral Galaxy NGC 3359 written by John Roger Ball and published by . This book was released on 1984 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have conducted a detailed study of the dynamics of the neutral hydrogen gas in the bright northern barred spiral galaxy NGC 3359. Observations of the 21 cm line at the Very Large Array have been reduced to give single-channel maps with a spatial resolution of 18", and a velocity resolution of 25 km/s. The acquisition, calibration, and reduction of the data are discussed in some detail. Maps of the integrated column density and mean velocity of the atomic hydrogen, derived from the channel maps, provide the principal data for an investigation of the dynamics associated with the spiral structure of the galaxy. On scales comparable to the resolution of this survey, approximately 1 kpc at the distance of NGC 3359, the gas is broken up into a somewhat chaotic distribution of local maxima and minima. However, on larger scales the column density shows a smooth, grand design spiral pattern with two principal spiral arms. The extent and density of these two arms are roughly equal in the 21 cm map, unlike the optical image. These neutral hydrogen arms are very well correlated with the positions of H II regions. The observed velocity field of NGC 3359 shows large kinematical deviations from simple rotation. The locations of the disturbances are closely correlated with the optical and 21 cm spiral structure, and indicate that significant spiral streaming motions are present in the arms. We have performed numerical modeling of the galaxy, using the well-known "beam scheme" hydrodynamical code, to attempt to reproduce the observed kinematics. Two types of model have been employed. In the first, the spiral structure is driven by an inhomogeneous, triaxial bar, whose density distribution is determined from near infrared surface photometry. The alternative is an oval distortion of the underlying disk surface density. In models which depend solely on the triaxial bar, the kinematical perturbations in the galaxy's outer regions are far too weak, relative to those near the bar. The oval distortion models fit the observed velocities much more accurately. We conclude that the spiral structure in NGC 3359 cannot be driven entirely by the nonaxisymmetric force produced by the observed optical bar.