Galactic Magnetic Field Structure And Ultrahigh Energy Cosmic Ray Propagation

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Galactic Magnetic Field Structure And Ultrahigh Energy Cosmic Ray Propagation

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Author :
language : en
Publisher:
Release Date : 2001

Galactic Magnetic Field Structure And Ultrahigh Energy Cosmic Ray Propagation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

Propagation Of Ultrahigh Energy Cosmic Rays In The Galaxy And Search For Their Sources

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Author : Gwenael Giacinti
language : en
Publisher:
Release Date : 2011

Propagation Of Ultrahigh Energy Cosmic Rays In The Galaxy And Search For Their Sources written by Gwenael Giacinti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

On The Possible Association Of Ultra High Energy Cosmic Rays With Nearby Active Galaxies

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Author :
language : en
Publisher:
Release Date : 2008

On The Possible Association Of Ultra High Energy Cosmic Rays With Nearby Active Galaxies written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.

Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of cosmic rays (CRs) with energies>57 EeV that suggests a correlation with the positions of active galactic nuclei (AGN) located within H"5 Mpc. However, this analysis does not take into account AGN morphology. A detailed study of the sample of AGN whose positions correlate with the CR events shows that most of them are classified as Seyfert 2 and low-ionization nuclear emission-line region (LINER) galaxies which do not differ from other local AGN of the same types. Therefore, the claimed correlation between the CR events observed by the Pierre Auger Observatory and local active galaxies should be considered as resulting from a chance coincidence, if the production of the highest energy CRs is not episodic in nature, but operates in a single object on long (e"Myr) timescales. Additionally, most of the selected sources do not show significant jet activity, and hence--in the framework of the jet paradigm--there are no reasons for expecting them to accelerate CRs up to the highest energies, H"02° eV, at all. If the extragalactic magnetic fields and the sources of these CRs are coupled with matter, it is possible that the deflection angle is larger than expected in the case of a uniform source distribution due to effectively larger fields. A future analysis has to take into account AGN morphology and may yield a correlation with a larger deflection angle and/or more distant sources. We further argue that Cen A alone could be associated with at least 4 events due to its large radio extent, and Cen B can be associated with more than 1 event due to its proximity to the Galactic plane and, correspondingly, the stronger Galactic magnetic field the ultra high energy CRs (UHECRs) encounter during propagation. If the UHECRs associated with these events are indeed accelerated by Cen A and Cen B, their deflection angles may provide information on the structure of the magnetic field in the direction of these putative sources. Future -ray observations (by, e.g., Gamma-Ray Large Area Space Telescope [GLAST], High Energy Stereoscopic System [HESS]) may provide additional clues to the nature of the accelerators of the UHECRs in the local Universe.

Ultra High Energy Particle Astrophysics

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Author : Shigeru Yoshida
language : en
Publisher: Nova Publishers
Release Date : 2003

Ultra High Energy Particle Astrophysics written by Shigeru Yoshida and has been published by Nova Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Science categories.

Many kinds of radiation exist in the universe, including photons and particles with a wide range of energies. Some of the radiation is produced in stars and galaxies, and some is cosmological background radiation, a relic from the history of cosmic evolution. Among all this radiation, the most energetic are cosmic ray particles: nucleons, nuclei, and even extremely energetic gamma rays. There are some observational facts about cosmic rays to give suggestions on their origin. The most important one among them is that the energy spectrum of high energy cosmic rays above 10 GeV (where the magnetic field of the sun is no longer a concern) is well represented by a power law form. This indicates cosmic ray particles are products of non-thermal processes. Their energy extends over more than 13 decades from 107 eV up to 1020 eV. In terms of its structure, the spectrum can be divided into three regions: two 'knees' and one 'ankle'. The first 'knee' appears around 3×1015 eV where the spectral power law index changes from -2.7 to -3.0. The second 'knee' is somewhere between 1017 eV and 1018 eV where the spectral slope changes from -3.0 to around -3.3. The 'ankle' is seen at or after 3×1018 eV. Above that energy the spectral slope is around -2.7, but with a large uncertainty because of poor statistics and resolution. This book deals with the final and most energetic population, the Ultra High Energy Cosmic Rays (UHECRs).

On The Acceleration Dynamics And Propagation Of Cosmic Rays

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Author : Paul Simeon
language : en
Publisher:
Release Date : 2014

On The Acceleration Dynamics And Propagation Of Cosmic Rays written by Paul Simeon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

The complete story of the origin, acceleration, and propagation of cosmic rays has remained a mystery for over a century. No conclusive evidence exists for how supernova remnants, the known sources of at least a large fraction of galactic cosmic rays, can accelerate cosmic rays up to the required energies. The origin of extragalactic cosmic rays is still completely unknown, with active galactic nuclei, gamma-ray bursts, certain types of neutron stars, and large scale shocks being the most popular candidates. This dissertation focuses on three separate but related topics: the interaction of anisotropic plasmas and cosmic rays, the propagation of cosmic rays in the presence of dense gas clouds, and the acceleration of extragalactic cosmic rays by strong accretion shocks around clusters and filaments of galaxies. The first major topic relaxes the common assumption that astrophysical plasmas have an isotropic pressure distribution caused by the presence of a magnetic field. We derive the dispersion relation for such a plasma with anisotropic magnetohydrodynamics as well as instabilities that are likely to amplify the magnetic field. This amplification may help to explain how shock fronts amplify the ambient magnetic field and accelerate cosmic rays to higher energies. The second major section examines the effect of dense gas clouds on the magnetic field and consequently on the propagation and emission of cosmic rays. This chapter is an attempt to gain insight on the gamma-ray spectrum of supernova remnants in such environments, where the spatial distribution and the spectral index of cosmic rays remains unexplained. The third topic uses new observations and simulations to modify a model of ultra-high-energy cosmic rays from strong accretion shocks. New evidence suggests that shocks around the large-scale structure of the universe -- not only shocks around galaxy clusters -- are adequate for accelerating cosmic rays up to the highest energies. Though the composition of these particles remains unknown, we propose two potential composition models, one with only protons and one with protons and heavy nuclei. Though the applications and environments discussed in each chapter varies, the underlying principles are similar. The full story of cosmic rays is not a simple one, and we hope that additions we have added to the standard theory provide useful tools for understanding other aspects of cosmic rays and perhaps other areas of astrophysics.

Cosmic Ray Propagation In Turbulent Galactic Magnetic Fields

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Author : Amit Seta
language : en
Publisher:
Release Date : 2019

Cosmic Ray Propagation In Turbulent Galactic Magnetic Fields written by Amit Seta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.

Cosmic Ray Transport And Signatures In Their Local Environment

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Author : Vasundhara Shaw
language : en
Publisher:
Release Date : 2023*

Cosmic Ray Transport And Signatures In Their Local Environment written by Vasundhara Shaw and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023* with categories.

The origin and structure of magnetic fields in the Galaxy are largely unknown. What is known is that they are essential for several astrophysical processes, in particular the propagation of cosmic rays. Our ability to describe the propagation of cosmic rays through the Galaxy is severely limited by the lack of observational data needed to probe the structure of the Galactic magnetic field on many different length scales. This is particularly true for modelling the propagation of cosmic rays into the Galactic halo, where our knowledge of the magnetic field is particularly poor. In the last decade, observations of the Galactic halo in different frequency regimes have revealed the existence of out-of-plane bubble emission in the Galactic halo. In gamma rays these bubbles have been termed Fermi bubbles with a radial extent of ≈ 3 kpc and an azimuthal height of ≈ 6 kpc. The radio counterparts of the Fermi bubbles were seen by both the S-PASS telescopes and the Planck satellite, and showed a clear spatial overlap. [...].

High Energy Radiation From Black Holes

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Author : Charles D. Dermer
language : en
Publisher: Princeton University Press
Release Date : 2009-09-21

High Energy Radiation From Black Holes written by Charles D. Dermer 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 2009-09-21 with Science categories.

Bright gamma-ray flares observed from sources far beyond our Milky Way Galaxy are best explained if enormous amounts of energy are liberated by black holes. The highest- energy particles in nature--the ultra-high-energy cosmic rays--cannot be confined by the Milky Way's magnetic field, and must originate from sources outside our Galaxy. Understanding these energetic radiations requires an extensive theoretical framework involving the radiation physics and strong-field gravity of black holes. In High Energy Radiation from Black Holes, Charles Dermer and Govind Menon present a systematic exposition of black-hole astrophysics and general relativity in order to understand how gamma rays, cosmic rays, and neutrinos are produced by black holes. Beginning with Einstein's special and general theories of relativity, the authors give a detailed mathematical description of fundamental astrophysical radiation processes, including Compton scattering of electrons and photons, synchrotron radiation of particles in magnetic fields, photohadronic interactions of cosmic rays with photons, gamma-ray attenuation, Fermi acceleration, and the Blandford-Znajek mechanism for energy extraction from rotating black holes. The book provides a basis for graduate students and researchers in the field to interpret the latest results from high-energy observatories, and helps resolve whether energy released by rotating black holes powers the highest-energy radiations in nature. The wide range of detail will make High Energy Radiation from Black Holes a standard reference for black-hole research.

Astrophysics At Ultra High Energies

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Author : Maurice Mandel Shapiro
language : en
Publisher: World Scientific Publishing Company Incorporated
Release Date : 2007

Astrophysics At Ultra High Energies written by Maurice Mandel Shapiro and has been published by World Scientific Publishing Company Incorporated this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Science categories.

Relativistic Astrophysics And Cosmology Proceedings Of The Eighteenth Texas Symposium

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Author : Angela V Olinto
language : en
Publisher: World Scientific
Release Date : 1998-06-05

Relativistic Astrophysics And Cosmology Proceedings Of The Eighteenth Texas Symposium written by Angela V Olinto and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-06-05 with categories.

Since 1963, the Texas Symposia have been a biennial, peripatetic forum for forefront developments on a wide range of topics in relativistic astrophysics, from pulsars to string theory, from the birth of the universe to the death of stars. The 26 plenary lectures, 230 parallel session talks and 265 poster presentations attest to the scientific vitality of this interdisciplinary field.