Download or read book Very High Energy Gamma Ray Emission from Active Galactic Nuclei written by Wai-Ying Mak and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Very High Energy Gamma ray Emission from Active Galactic Nuclei written by Wai-ying Mak and published by . This book was released on 1999 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Search for Very High Energy Gamma ray Emission from Active Galactic Nuclei Using Multivariate Analysis Techniques written by Stephen Gammell and published by . This book was released on 2004 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Very High Energy Phenomena in the Universe written by Yannick Giraud-Héraud and published by Atlantica Séguier Frontières. This book was released on 1997 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Astrophysical Sources of High Energy Particles and Radiation written by M.M. Shapiro and published by Springer Science & Business Media. This book was released on 2013-04-18 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: A wide range of topics are covered, ranging from supernovae to active galactic nuclei, cosmic gamma rays to neutrinos and dark matter. The basic emphasis is on physics / astrophysics and experimental / observational techniques, scientific implications of current results, and prospects for future advances. The fields surveyed are in rapid development and the exploration of our high energy universe is proceeding rapidly, with exciting new discoveries. What unifies much of the new data is the idea of particle acceleration to enormous energies and the subsequent interactions of the particles with the local medium. It this focus that makes the book both timely and an important contribution to the field.
Download or read book Active Galactic Nuclei written by Ian Robson and published by . This book was released on 1996-05-07 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the energy source and physical processes within active galaxies are the most challenging areas of current research. Using a logical format and easy-to-follow explanations, Robson demonstrates the crucial connections between observation and theory, illustrating how diverse classes of active galaxies fit into the contemporary perspective. Summary sections explain the physical concepts behind the mathematics.
Download or read book A Search for Ultra high Energy Gamma Rays from Active Galactic Nuclei written by Michael Anthony Catanese and published by . This book was released on 1994 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gamma ray Large Area Space Telescope written by and published by . This book was released on 1998 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radio Galaxies at TeV Energies written by Dorit Glawion and published by MDPI. This book was released on 2020-05-13 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is common believe that the centers of all galaxies exhibit supermassive black holes with masses ranging from millions up to billions of the mass of our Sun. By accreting surrounding matter, the luminosity of these galactic nuclei can outshine the emission of their host galaxies. If this is the case, they are called active galactic nuclei. Some of these objects eject powerful outflows composed of plasma, called jets. These jets can produce non-thermal radiation which observable across the entire electromagnetic spectrum from radio up to the gamma-ray frequencies. At highest frequencies (TeV range) most of the detected active galaxies have jets directed along or close to the line of sight. However, also galaxies with larger angles to the line of sight showing fascinating features were discovered, in seeming contradiction to traditional models for these so-called radio galaxies. Thus, the latter are of particular importance for understanding active galactic nuclei in general. This Special Issue contains reviews and research articles about the current knowledge of radio galaxies at TeV energies, including observational results and theoretical models. It is intended to guide the interested reader deeper into this fascinating discipline of modern day astronomy.
Download or read book Very High Energy Cosmic Gamma Radiation written by Felix A. Aharonian and published by World Scientific. This book was released on 2004 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gamma ray astronomy, the branch of high energy astrophysics that studies the sky in energetic ?-ray photons, is destined to play a crucial role in the exploration of nonthermal phenomena in the Universe in their most extreme and violent forms. The great potential of this discipline offers impressive coverage of many OC hot topicsOCO of modern astrophysics and cosmology, such as the origin of galactic and extragalactic cosmic rays, particle acceleration and radiation processes under extreme astrophysical conditions, and the search for dark matter."
Download or read book Observation of Very High Energy Gamma rays from Active Galactic Nuclei and Characterization of Their Non thermal Emission Mechanisms written by Wrijupan Bhattacharyya and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book TeV Gamma Ray Astrophysics written by Heinrich J. Völk and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: The `International Heidelberg Workshop on TeV Gamma-Ray Astrophysics' brought together astrophysicists from the various fields which play a role in the formation of high energy gamma-ray emission. In particular, theoretical and observational aspects of the physics and astrophysics of pulsars and quasars, the acceleration of particles at Supernova Remnants and other strong astrophysical shock fronts, and cascade processes in universal background photon fields were comprehensively discussed in more than thirty reviews by leading experts. In their entirety these reviews describe the birth of a new field of astronomy. This field concerns cosmic gamma-rays of very high energy which are observed with ground-based optical telescopes due to the Cherenkov emission of the secondary particles created by the interaction of these gamma-rays with atoms in the Earth's atmosphere. Beyond that, the workshop encompassed the latest developments and trends in theory and observation of cosmic gamma-ray sources of all energies, from nuclear gamma-ray lines in the MeV-region, through the Bremsstrahlung, Inverse Compton, and pion decay continuum emission, to gamma-rays due the decay of exotic relics from the early Universe. Audience: Specialists as well as students in physics and astrophysics and young research workers.
Download or read book Very High Energy Gamma Ray Astronomy written by T.C. Weekes and published by CRC Press. This book was released on 2003-04-08 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: High energy gamma-ray photons are the prime probes of the relativistic or high-energy universe, populated by black holes, neutron stars, supernovae, quasars, and matter-antimatter annihilations. Through studying the gamma-ray sky, astrophysicists are able to better understand the formation and behavior of these exotic and energetic bodies. V
Download or read book Relativistic Jets from Active Galactic Nuclei written by Markus Boettcher and published by John Wiley and Sons. This book was released on 2012-02-13 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a carefully selected consortium of researchers working in the field, this book fills the gap for an up-to-date summary of the observational and theoretical status. As such, this monograph includes all used wavelengths, from radio to gamma, the FERMI telescope, a history and theory refresher, and jets from gamma ray bursts. For astronomers, nuclear physicists, and plasmaphysicists.
Download or read book The Gamma Ray Sky with Compton GRO and SIGMA written by M. Signore and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume consists of invited lectures and seminars presented at the NATO Advanced Study Institute "The Gamma Ray Sky with COMPTON GRO and SIGMA" , which was held at the Centre de Physique Theorique of Les Houches (France) in January / February 1994. The school has been planned by a Scientific Organizing Committee. It was organized with the aim of providing students and young researchers with an up-to-date account of the high-energy phenomena in the vicinity of compact objets and the diffuse gamma-ray backgrounds after the early results from the gamma-ray telescope SIGMA and the four instruments onboard COMPTON GRO (Gamma Ray Observatory) : BATSE (Burst and Transient Source Experiment),COMPTEL(Compto'l Telescope),EGRET (Energetic Gamma Ray Experiment Telescope) and OS SE(Oriented Scintillation Spectrometer Experiment) . It was attended by more than sixty researchers from many countries. The lectures and seminars represent a complete coverage of our present knowledge and understanding of: Gamma-ray backgrounds, Gamma-ray Burts,Active Galactic Nuclei,Galactic Compact Objects, Gamma-ray Spectroscopy, Instrumentation and observation techniques, etc ... Most of these lectures are reproduced in this volume. Unfortunately, a few lecturers have chosen not to submit their manuscript.
Download or read book Investigating the Nature of High Energy Emission in Active Galactic Nuclei written by Michael Shea Dutka and published by . This book was released on 2014 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Active Galactic Nuclei (AGN) are extremely luminous objects that reside at the center of some galaxies. Radio loud AGN possess jets of plasma emanating from the center of their host galaxy. These jets are very bright at radio frequencies. Blazars are the most extreme subset of radio loud AGN, they are violently variable across the electromagnetic spectrum, highly polarized and their radio jets often show superluminal motion. The most likely explanation for the unusual properties of blazars is that their jets are pointed close to our line of sight. We study the high-energy emission mechanisms of blazars because gamma-rays account for a large fraction of the total energy emitted by blazars. Therefore, understanding the mechanisms of gamma-ray production in blazars is crucial to an overall understanding of how these objects work. In this dissertation we attempt to identify the basic mechanisms of gamma-ray emission in individual blazars by simultaneously monitoring their flux densities across the electromagnetic spectrum (radio though gamma-rays). We staged multi-wavelength observing campaigns using ground based and space based observatories for four blazars during active and quiescent gamma-ray states. Data from these campaigns are compiled into broadband spectral energy distributions (SEDs) ranging from radio to gamma-ray energies. The broadband SEDs are then fit with a one zone leptonic model of blazar emission in order to establish the most likely gamma-ray emission mechanism. One non-blazar radio loud AGN, 3C84, at the core of the galaxy NGC 1275 is studied in depth using the VLBA. Blazars and other radio loud AGN only differ by the viewing angle thus the same physical processes are common in both types of objects. The AGN 3C84 is interesting because it is nearby (z=0.017559), it is the brightest member of the Perseus cluster, and it is one of the few non-aligned gamma-ray emitting AGN. We obtained six epochs of data, at 22 and 43 gHz, with the VLBA and we constructed a map of the spectral index for every epoch. We find a pattern in the flares that we have modeled. Some flares can be fit by adjusting only the electron energy distribution while others require changes in other parameters in the model, such as the magnetic field or the size of the emitting region. We find two flat spectrum components in the parsec scale structure of 3C84. We do not see any obvious correlation between the parsec scale radio activity in the jet of 3C84 and its gamma-ray emission levels.
Download or read book The Universe in Gamma Rays written by Volker Schönfelder and published by Springer Science & Business Media. This book was released on 2001-08-10 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: After describing cosmic gamma-ray production and absorption, the instrumentation used in gamma-ray astronomy is explained. The main part of the book deals with astronomical results, including the somewhat surprising result that the gamma-ray sky is continuously changing.
