A Study of the Intergalactic Magnetic Field Using Extra-galactic Ultra High Energy [gamma]-ray Sources PDF Download
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![A Study of the Intergalactic Magnetic Field Using Extra-galactic Ultra High Energy [gamma]-ray Sources PDF](https://books.google.com/books/content/images/frontcover/VK2GuAAACAAJ?fife=w150-h200)
Author: M. Honda
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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![A Study of the Intergalactic Magnetic Field Using Extra-galactic Ultra High Energy [gamma]-ray Sources PDF](https://books.google.com/books/content/images/frontcover/VK2GuAAACAAJ?fife=w80-h100)
Author: M. Honda
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Author: Felix A. Aharonian
Publisher: World Scientific
ISBN: 9789812561732
Category : Science
Languages : en
Pages : 516
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Book Description
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."
Author: Timothy Christian Arlen
Publisher:
ISBN:
Category :
Languages : en
Pages : 210
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Gamma ray photons, with energies>TeV propagating cosmological distances will be attenuated by pair production with diffuse extragalactic background photon fields-both the cosmic microwave background (CMB) radiation and the UV - far-IR extragalactic background light (EBL). The produced electron/positron pairs will subsequently inverse Compton scatter background photons up to GeV - TeV energies, and some of these upscattered photons may also initiate pair production in the formation of an electromagnetic cascade. If an intergalactic magnetic field (IGMF) exists on cosmological length scales of relevance to the cascade, it will deflect the electrons and positrons and will leave an imprint on the resulting spectral, angular, and temporal properties of the cascade radiation. The primary goal of this study was to constrain the properties of the IGMF using data from known sources of TeV gamma-rays. This thesis describes the construction of a high precision, 3-dimensional, particle-tracking Monte Carlo simulation code to model the intergalactic electromagnetic cascade, and uses it to systematically explore the effects of the IGMF on the cascades in multiple observational domains. We then compare the simulations with gamma-ray data from current generation ground-based gamma-ray instruments such as VERITAS, HESS, and MAGIC, sensitive to TeV-scale energies, as well as the Fermi satellite, sensitive to the GeV-scale. This novel technique of constraining the IGMF has rapidly emerged over the last decade as gamma-ray instruments have become more sensitive and as theoretical understanding of the cascade process has progressed. This emerging field has proven to be richly complex and we find that the data from current generation gamma-ray instruments do not allow for an unambiguous upper or lower limit to be placed on the IGMF at present. We do find it likely that the next generation ground based gamma-ray observatory, the Cherenkov Telescope Array (CTA) will be able to detect unambiguous signatures of gamma-ray cascading if the IGMF magnitude is within a certain range, and thus provide a robust constraint on IGMF properties.
Author: Josep M. Paredes
Publisher: Springer Science & Business Media
ISBN: 140206117X
Category : Science
Languages : en
Pages : 496
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Book Description
This book provides a theoretical and observational overview of the state of the art of gamma-ray astrophysics, and their impact and connection with the physics of cosmic rays and neutrinos. With the aim of shedding new and fresh light on the problem of the nature of the gamma-ray sources, particularly those yet unidentified, this book summarizes contributions to a workshop that continues today.
![Probing Intergalactic Magnetic Fields from [gamma]-ray Observations PDF](https://books.google.com/books/content/images/frontcover/Y1BinQAACAAJ?fife=w80-h100)
Author: Wenlei Chen
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 171
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Book Description
The large-scaled magnetic fields in intergalactic space may contain detailed information of the primordial magnetic fields produced in the early Universe. The generation of the cosmological matter-antimatter asymmetry may produce helical magnetic fields via CP (charge conjugation and parity) violating interactions during matter-genesis. Thus, the study of the intergalactic magnetic field (IGMF) could provide a new window on early-Universe cosmology. IGMFs deflect the electron-positron pairs produced by TeV gamma-rays from blazars, resulting in broadened beams of cascade GeV gamma-rays known as pair halos. In the presence of helical IGMFs, cascade GeV gamma-rays at different energies from a distant source fall into patterns in the observation plane in the GeV gamma-ray sky that have a similar chirality. These signatures of the IGMF on the gamma-ray emission from extragalactic sources, i.e. pair halos and helical patterns, can be observed using data from the Fermi Large Area Telescope (Fermi-LAT). In this dissertation, I describe methods for probing the IGMF using gamma-ray observations. I report on the results of a search for gamma-ray pair halos with a stacking analysis of low-redshift blazars using data from Fermi-LAT. For this analysis we used a number of a priori selection criteria, including the spatial and spectral properties of the Fermi sources. The angular distribution of ~1 GeV photons around 24 stacked isolated high-synchrotron-peaked BL Lacs with redshift z 0.5 shows an excess over that of point-like sources. A frequentist test yields a p-value of p ~0.01 for the extended emission against the point-source hypothesis. A Bayesian estimation provides the common logarithm of Bayes factors 2, consistent with expectations for pair halos produced in the IGMF with strength of ~10−17 to 10−15 Gauss. In addition, I present a search for parity violating signatures of helical IGMFs in the GeV gamma-ray sky. In this study, the IGMF helicity is examined by evaluating a parity-odd statistic using gamma-ray data obtained from Fermi-LAT observations at high galactic latitudes. The resulting negative values of the parity-odd statistic imply that there is an excess of left-handed spirals in the gamma-ray sky, indicating a left-handed helicity consistent with a helical magnetic field with strength of ~10−14 Gauss on ~10 Mpc scales.
Author: R. Beck
Publisher: Springer Science & Business Media
ISBN: 9780792307044
Category : Science
Languages : en
Pages : 582
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Book Description
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.
Author: Richard Wielebinski
Publisher: Springer Science & Business Media
ISBN: 9783540241751
Category : Science
Languages : en
Pages : 306
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Book Description
While magnetic fields permeate the universe on all scales, the present book is dedicated to their investigation on the largest scales and affords a balanced account of both theoretical and observational aspects. Written as a set of advanced lectures and tutorial reviews that lead up to the forefront of research, this book offers both a modern source of reference for the experienced researchers as well as a high-level introductory text for postgraduate students and nonspecialist researchers working in related areas.
Author:
Publisher: Cambridge University Press
ISBN: 0521631637
Category :
Languages : en
Pages : 297
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Author: Remo Ruffini
Publisher: World Scientific
ISBN: 9811269785
Category : Science
Languages : en
Pages : 4880
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Book Description
The proceedings of MG16 give a broad view of all aspects of gravitational physics and astrophysics, from mathematical issues to recent observations and experiments. The scientific program of the meeting included 46 plenary presentations, 3 public lectures, 5 round tables and 81 parallel sessions arranged during the intense six-day online meeting. All talks were recorded and are available on the ICRANet YouTube channel at the following link: www.icranet.org/video_mg16.These proceedings are a representative sample of the very many contributions made at the meeting. They contain 383 papers, among which 14 come from the plenary sessions.The material represented in these proceedings cover the following topics: accretion, active galactic nuclei, alternative theories of gravity, black holes (theory, observations and experiments), binaries, boson stars, cosmic microwave background, cosmic strings, dark energy and large scale structure, dark matter, education, exact solutions, early universe, fundamental interactions and stellar evolution, fast transients, gravitational waves, high energy physics, history of relativity, neutron stars, precision tests, quantum gravity, strong fields, and white dwarf; all of them represented by a large number of contributions.The online e-proceedings are published in an open access format.
Author: Astronomisches Rechen-Institut
Publisher: Springer Science & Business Media
ISBN: 3662123703
Category : Science
Languages : en
Pages : 1433
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Book Description
From the reviews: "Astronomy and Astrophysics Abstracts has appeared in semi-annual volumes since 1969 and it has already become one of the fundemental publications in the fields of astronomy, astrophysics and neighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. ...The abstracts are classified under more than a hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world." Space Science Review# "Dividing the whole field plus related subjects into 108 categories, each work is numbered and most are accompanied by brief abstracts. Fairly comprehensive cross-referencing links relevant papers to more than one category, and exhaustive author and subject indices are to be found at the back, making the catalogues easy to use. The series appears to be so complete in its coverage and always less than a year out of date that I shall certainly have to make a little more space on those shelves for future volumes." The Observatory Magazine#
