Galactic Geometry
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Galactic Geometry
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Author : Lisa Arias
language : en
Publisher: Britannica Digital Learning
Release Date : 2019-06-01
Galactic Geometry written by Lisa Arias and has been published by Britannica Digital Learning this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-06-01 with Juvenile Nonfiction categories.
Get ready to discover and uncover the properties of shapes. Learn all about dimensions, length, width, and 2- and 3-dimensional shapes. With the rhyming text in this book, you will discover hexagons, polygons, pentagons, and so much more in a fun and easy to understand way! So blast off and learn all about galactic geometry! This book will allow students to understand that attributes belonging to a category of 2- or 3-dimensional figures also belong to all subcategories of that category.
Galactic Geometry
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Author : Lisa Arias
language : en
Publisher: Carson-Dellosa Publishing
Release Date : 2014-08-01
Galactic Geometry written by Lisa Arias and has been published by Carson-Dellosa Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-08-01 with Juvenile Nonfiction categories.
Get ready to discover and uncover the properties of shapes. Learn all about dimensions, length, width, and 2- and 3-dimensional shapes. With the rhyming text in this book, you will discover hexagons, polygons, pentagons, and so much more in a fun and easy to understand way! So blast off and learn all about galactic geometry! This book will allow students to understand that attributes belonging to a category of 2- or 3-dimensional figures also belong to all subcategories of that category.
The Geometry Of The Universe
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Author : Colin Rourke
language : en
Publisher: World Scientific
Release Date : 2021-06-03
The Geometry Of The Universe written by Colin Rourke and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-03 with Science categories.
Cosmology, the study of the universe, arouses a great deal of public interest, with serious articles both in the scientific press and in major newspapers, with many of the theories and concepts (e.g. the 'big bang' and 'black holes') discussed, often in great depth.Accordingly the book is divided into three parts:Part 1 is readable (and understandable) by anyone with a nodding acquaintance with the basic language of cosmology: events, lights paths, galaxies, black holes and so on. It covers the whole story of the book in a way as untechnical as possible given the scope of the topics covered.Part 2 covers the same ground again but with enough technical details to satisfy a reader with basic knowledge of mathematics and/or physics.Part 3 consists of appendices which are referred to in the other parts and which also contain the highly technical material omitted from Section 2.
Galactic Astronomy
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Author : James Binney
language : en
Publisher: Princeton University Press
Release Date : 2021-07-13
Galactic Astronomy written by James Binney and has been published by Princeton University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-07-13 with Science categories.
This is the definitive treatment of the phenomenology of galaxies--a clear and comprehensive volume that takes full account of the extraordinary recent advances in the field. The book supersedes the classic text Galactic Astronomy that James Binney wrote with Dimitri Mihalas, and complements Galactic Dynamics by Binney and Scott Tremaine. It will be invaluable to researchers and is accessible to any student who has a background in undergraduate physics. The book draws on observations both of our own galaxy, the Milky Way, and of external galaxies. The two sources are complementary, since the former tends to be highly detailed but difficult to interpret, while the latter is typically poorer in quality but conceptually simpler to understand. Binney and Merrifield introduce all astronomical concepts necessary to understand the properties of galaxies, including coordinate systems, magnitudes and colors, the phenomenology of stars, the theory of stellar and chemical evolution, and the measurement of astronomical distances. The book's core covers the phenomenology of external galaxies, star clusters in the Milky Way, the interstellar media of external galaxies, gas in the Milky Way, the structure and kinematics of the stellar components of the Milky Way, and the kinematics of external galaxies. Throughout, the book emphasizes the observational basis for current understanding of galactic astronomy, with references to the original literature. Offering both new information and a comprehensive view of its subject, it will be an indispensable source for professionals, as well as for graduate students and advanced undergraduates.
Probing The Physics And Geometry Of Active Galactic Nuclei
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Author : Jake Arthur Jack Mitchell
language : en
Publisher:
Release Date : 2022
Probing The Physics And Geometry Of Active Galactic Nuclei written by Jake Arthur Jack Mitchell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Galactic And Intergalactic Magnetic Fields
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Author : R. Beck
language : en
Publisher: Springer Science & Business Media
Release Date : 1990-04-30
Galactic And Intergalactic Magnetic Fields written by R. Beck and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-04-30 with Science categories.
This Symposium, the first devoted entirely to the measurement and the role of magnetic fields in the non-solar Universe, was held in Heidelberg, on June 19-23, 1989. The meeting began with review talks on magnetic phenomena near the solar photosphere, corona, and in stellar winds, since these nearby "laboratories", studied for many years, provide much of the prior knowl edge of magnetic effects in astrophysical plasmas. The Symposium contained presentations of considerable new work concerning the role of magnetic fields in accretion disks, bipolar outflows, and related magnetic phenomena in molecular clouds and star forming regions. Both observa tions and related theory of the large-scale magnetic fields in the Milky Way were covered, in addition to a session on the more general theme of magnetohydrodynamics of galactic magnetic fields. Dynamo mechanisms were discussed in considerable detail. It was apparent that recent observational data on polarized emission from external galaxies are now of sufficiently high quality that meaningful tests of large-scale field amplification, and of ideas on the origin of galactic magnetic fields, can be undertaken. Both new observations and numerical simulation work were described in the context of active galaxy nuclei, supernova remnants, radio source jets and extended lobes, and also in the environment of galaxy clusters. Recent large-scale computer simulations incorporating magnetic fields in star formation, radio source jets, and many other phenomena were presented, and much of this was very new.
Probing The Geometry And Physics Of The Emission Region In Active Galactic Nuclei Using Hard X Ray Gamma Ray Observations
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Author :
language : en
Publisher:
Release Date : 2010
Probing The Geometry And Physics Of The Emission Region In Active Galactic Nuclei Using Hard X Ray Gamma Ray Observations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
The X-ray spectra of (almost equal to)200 AGN collected from Swift-BAT were analyzed to test the Unified Model for AGN. Specifically, the photon indices, high energy cutoffs, and reflection components of Sy1 and Sy2 were compared. Under the Unified Model, the photon indices and reflection components for Sy1 should be larger than Sy2 and the high energy cutoffs should be the same. Fitting a simple power law model to the sample spectra proved to be insufficient. The PEXRAV model fit the spectra of the Sy1 and Sy2 significantly better, indicating that a reflection component and/or high energy cutoff exists as the Unified Model expects. Using both the simple power law and PEXRAV models it was concluded that in the population studied, Sy1 had a larger photon index than Sy2, as expected by the Unified Model. For Sy1 and Sy2, the reflection components were found to be compatible, but given the large errors, this finding cannot be said to be evidence against the Unified Model. However, it was concluded that Sy1 and Sy2 have different high energy cutoffs, which is unexpected under the Unified Model.
The Galactic Black Hole
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Author : H Falcke
language : en
Publisher: CRC Press
Release Date : 2002-12-16
The Galactic Black Hole written by H Falcke and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-12-16 with Science categories.
The supermassive black hole in the center of our Milky Way is the nearest such object and relatively easy to observe and study. Not surprisingly therefore, it is the best studied supermassive black hole. Many astrophysical and even general relativistic effects can be investigated in great detail. The Galactic Black Hole: Lectures on General Relativity and Astrophysics provides a systematic introduction to the physics/astrophysics and mathematics of black holes at a level suitable for graduate students, postdocs, and researchers in physics, astrophysics, astronomy, and applied mathematics. The focus is mainly on the supermassive black hole in the center of our Milky Way but the results can be easily generalized taking it as an example. Leading international experts provide first-hand accounts of the observational and theoretical aspects of this black hole. Topics range from the properties of the Schwarzschild metric and the collapse of a black hole, to quantum gravity, and from the structure of the Galaxy to accretion of matter and the emission properties of the Galactic Center black hole.
Exploring The Geometry Of Circumnuclear Material In Active Galactic Nuclei Through X Ray Spectroscopy
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Author : Elizabeth Scirocco Rivers
language : en
Publisher:
Release Date : 2012
Exploring The Geometry Of Circumnuclear Material In Active Galactic Nuclei Through X Ray Spectroscopy written by Elizabeth Scirocco Rivers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
I have studied the X-ray spectral properties of active galactic nuclei (AGN) in order to gain a better understanding of the nature of the circumnuclear material surrounding the central black hole in these objects. From the RXTE archive I constructed two survey samples of broad band X-ray spectra. The first was a bright sample of 23 AGN that had high quality spectra up to at least 100 keV, which provided constraints on the high energy rollover expected by models of inverse Comptonization of low energy photons. The average lower limit to E/roll was ~225 keV for the majority of objects, implying a coronal electron temperature of kBTe & ge;75 keV for these models. The second sample was an expanded survey of ~100 AGN for which spectral parameters could be well-determined. I compared Fe line equivalent widths with measured Compton reflection hump strengths and found that on average ~40% of the Fe line emission comes from reflection off Compton-thick material, with the remainder likely arising in isotropic emission from Compton-thin gas. In the full sample, the distributions of photon indices for Seyfert 1's and 2's were consistent with the idea that Seyferts share a common central engine, however the distributions of Compton reflection hump strengths did not support the classical picture of absorption by a torus and reflection off a Compton-thick disk with type depending only on inclination angle. I have concluded that a more complex reflecting geometry such as a combined disk and torus or clumpy torus is likely a more accurate picture of the Compton-thick material. I have performed additional analyses of individual objects. An occultation event in Cen A, discovered through RXTE monitoring, revealed the clumpy nature of its torus and placed constraints on the amount of material in the vicinity of the black hole in this object. A Suzaku long-look observation of MCG-2-58-22 provided constraints on the location of Fe line emitting material to & ge;1200 R/S, likely associated with the torus which was successfully modeled by the MYTorus reflection model. A Suzaku observation of Mkn 590 revealed a disappearing soft excess, possibly providing evidence that the soft excess is associated with thermal disk emission.
Galactic Dynamics
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Author : James Binney
language : en
Publisher: Princeton University Press
Release Date : 2011-10-30
Galactic Dynamics written by James Binney and has been published by Princeton University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-10-30 with Science categories.
Since it was first published in 1987, Galactic Dynamics has become the most widely used advanced textbook on the structure and dynamics of galaxies and one of the most cited references in astrophysics. Now, in this extensively revised and updated edition, James Binney and Scott Tremaine describe the dramatic recent advances in this subject, making Galactic Dynamics the most authoritative introduction to galactic astrophysics available to advanced undergraduate students, graduate students, and researchers. Every part of the book has been thoroughly overhauled, and many sections have been completely rewritten. Many new topics are covered, including N-body simulation methods, black holes in stellar systems, linear stability and response theory, and galaxy formation in the cosmological context. Binney and Tremaine, two of the world's leading astrophysicists, use the tools of theoretical physics to describe how galaxies and other stellar systems work, succinctly and lucidly explaining theoretical principles and their applications to observational phenomena. They provide readers with an understanding of stellar dynamics at the level needed to reach the frontiers of the subject. This new edition of the classic text is the definitive introduction to the field. ? A complete revision and update of one of the most cited references in astrophysics Provides a comprehensive description of the dynamical structure and evolution of galaxies and other stellar systems Serves as both a graduate textbook and a resource for researchers Includes 20 color illustrations, 205 figures, and more than 200 problems Covers the gravitational N-body problem, hierarchical galaxy formation, galaxy mergers, dark matter, spiral structure, numerical simulations, orbits and chaos, equilibrium and stability of stellar systems, evolution of binary stars and star clusters, and much more Companion volume to Galactic Astronomy, the definitive book on the phenomenology of galaxies and star clusters