Download or read book Search for Extragalactic Gamma ray Point Sources with the HEGRA Air Shower Array written by Stefan Westerhoff and published by . This book was released on 1996 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Extragalactic ray gamma Ray Point Sources with the HEGRA Air Shower Array written by Stefan Westerhoff and published by . This book was released on 1996 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Extragalactic Gamma ray Point Sources with the HEGAR Air Shower Array written by and published by . This book was released on 1996 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Search for Point Sources of Ultrahigh Energy Gamma Rays with the South Pole Air Shower Array written by John Van Stekelenborg and published by . This book was released on 1993 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Energy Gamma Ray Astronomy written by Matthews and published by American Institute of Physics. This book was released on 1991 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gamma-ray, cosmic ray and high-energy physicists, research libraries and universities, research laboratories and government agencies.
Download or read book Development and a Performance Test of a Prototype Air Shower Array for Search for Gamma Ray Point Sources in the Very High Energy Region written by M. Amenomori and published by . This book was released on 1989 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 254 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 Transient Searches with the Hawc Gamma ray Observatory written by Alison Peisker and published by . This book was released on 2021 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The universe contains many extremely energetic astrophysical sources that emit particles on timescales from fractions of a second to thousands of years. Studying these sources through gamma-ray and multi-messenger astronomy may help to reveal the answers to several remaining fundamental questions in physics. The High Altitude Water Cherenkov (HAWC) gamma-ray observatory, an extensive air shower array, is well-suited to perform transient searches due to its large field of view and high duty cycle. In this work, a catalog search of all very-high-energy gamma-ray sources in HAWC's field of view is conducted, revealing a total of 65 sources. Then a search for evaporating primordial black holes is performed. None are detected, so upper limits are set on their burst rate density. Finally, the IceCube neutrino observatory is introduced in order to perform a multi-messenger search for flaring gamma rays and neutrinos originating from the same point in the sky. None are detected, so upper limits are placed on the rate density and total energy of sources that produce both gamma rays and neutrinos. Performing these searches contributes to the understanding of the origins of cosmic rays and how astrophysical sources accelerate their particles to the high energies that are observed on Earth.
Download or read book Search for PeV Gamma Rays with the IceCube Observatory written by Zachary Dean Griffith and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last several decades, a wealth of observations of gamma-ray emission at TeV energies has increased our understanding of the extreme physical processes happening in our Galaxy. However, fundamental questions remain unanswered. To how high an energy are cosmic rays able to be accelerated in our galaxy, and how does that connect with the features observed in the cosmic-ray energy spectrum such as the "knee'', the "second knee'', and the "ankle''? Answers to these questions can be searched for by extending gamma-ray observations to higher energies. As the only experiment sensitive to PeV gamma rays in the Southern Hemisphere, the IceCube observatory can address these issues from a unique perspective. In this work, gamma-ray candidate events are selected from data observed by the surface and in-ice arrays of the IceCube observatory. This is accomplished by leveraging characteristic properties of gamma-ray induced air showers such as low muonic content and a deep shower maximum. Using five years of data, several searches for gamma-ray emission using unbinned likelihood methods are presented. The results of all searches are consistent with background, resulting in 90% flux upper limits that are the most stringent ever placed on PeV emission. The limits set on PeV gamma-ray point sources constrain, for the first time, the energy extension of a power-law flux for sources observed by HESS to have no break in their energy spectrum at TeV energies. Additionally, the resulting limit set by a search for an angular-integrated diffuse flux from the Galactic plane provides an upper bound useful for constructing Galactic cosmic-ray transport models
Download or read book Literature 1997 Part 1 written by Astronomisches Rechen-InstitutARI and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 1746 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astronomy and Astrophysics Abstracts is devoted to the recording, summarizing and indexing of astronomical publications throughout the world. Two volumes are scheduled to appear per year. Volume 67 records 10,903 papers covering besides the classical fields of astronomy and astrophysics such matters as space flights related to astronomy, lunar and planetary probes and satellites, meteorites and interplanetary matter, X rays and cosmic rays, quasars and pulsars. The abstracts are classified under more than one hundred subject categories thus permitting quick surveying of the bulk of material published on the same topic within six months. For instance, this volume records 119 papers on minor planets, 155 papers on supernovae, and 554 papers on cosmology.
Download or read book Gamma ray Large Area Space Telescope written by and published by . This book was released on 1998 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1993 with total page 1206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Search for Higher energy Radiation from Gamma ray Bursts written by Richard Schnee and published by . This book was released on 1996 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Gamma ray Point Sources written by Carl E. Fichtel and published by . This book was released on 1965 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Search for Gamma Ray Emission from the Region of the Galactic Center written by Glen Hamilton Dahlbacka and published by . This book was released on 1972 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gamma Ray Astronomy from 1011 to 1014 EV Using the Atmospheric Cerenkov Technique written by N. A. Porter and published by . This book was released on 1977 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: The atmospheric Cerenkov technique has been widely used over the past two decades to search for point sources of 1011 to 1014 eV gamma rays. In this technique the gamma rays are detected by the Cerenkov light emission from the small air showers that they create in the atmosphere. The basic principles underlying the technique are reviewed with particular reference to the experiments performed to date, (September 1977). The production and absorption processes that pertain to this energy region are discussed. There is strong evidence for the detection of 10^12 eV gamma rays from NP0532, Centaurus A and Cygnus X-3. Models for these, and other sources for which upper limits have been derived, are outlined. There appears to be no other technique that can compete with the atmospheric Cerenkov technique in this energy range. The methods by which the present flux sensitivity can be reduced by factors of 10 - 100 are discussed; it is also possible to extend observations into the previously unexplored 10 - 100 Gev energy range.
