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Author: Publisher: ISBN: Category : Languages : en Pages : 9
Book Description
Key results obtained by the OSSE instrument during the first four years of the Compton Gamma Ray Observatory mission are presented. OSSE has undertaken extended observations of the gamma ray emission from the galactic center region and found the positron annihilation radiation to be consistent with a two-component model: a spheroidal component located at the galactic center and a weaker galactic disk component. Simultaneous observations with the SIGMA imaging instrument have provided the first low-energy gamma ray spectrum of the diffuse continuum emission from the galactic center region. Results on galactic sources include the spectral observations of two new rotation-powered pulsars, PSR 1509-58 and Vela, the discovery of 110 keV cyclotron emission from the Be X-ray binary A0535+26, and the discovery that galactic black hole transients have two spectral classes: thermal and power-law. Extragalactic sources also have two spectral classes. Seyfert galaxies are typified by thermal spectral with exponential cutoffs from 50-300 keV, and blazars which exhibit power-law spectra that extend into the EGRET energy range. Blazar spectra also often have a spectral break in the MeV region.
Author: Publisher: ISBN: Category : Languages : en Pages : 9
Book Description
Key results obtained by the OSSE instrument during the first four years of the Compton Gamma Ray Observatory mission are presented. OSSE has undertaken extended observations of the gamma ray emission from the galactic center region and found the positron annihilation radiation to be consistent with a two-component model: a spheroidal component located at the galactic center and a weaker galactic disk component. Simultaneous observations with the SIGMA imaging instrument have provided the first low-energy gamma ray spectrum of the diffuse continuum emission from the galactic center region. Results on galactic sources include the spectral observations of two new rotation-powered pulsars, PSR 1509-58 and Vela, the discovery of 110 keV cyclotron emission from the Be X-ray binary A0535+26, and the discovery that galactic black hole transients have two spectral classes: thermal and power-law. Extragalactic sources also have two spectral classes. Seyfert galaxies are typified by thermal spectral with exponential cutoffs from 50-300 keV, and blazars which exhibit power-law spectra that extend into the EGRET energy range. Blazar spectra also often have a spectral break in the MeV region.
Author: J. D. Kurfess Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
The Oriented Scintillation Spectrometer Experiment (OSSE) for the Gamma Ray observatory is described. OSSE uses four identical NaI(Tl)-CsI(Na) phoswich detectors to provide gamma-ray line and continuum detection capability in the 0.05-10 MeV energy range. Additioal gamma-ray and neutron detection capability is achieved above 10 MeV. Each detector has a CsI annular shield and a tungsten alloy collimator which define a 5 x 11 deg (FWHM) field-of-view. The detectors have independent, single-axis orientation systems which permit offset pointing to provide source-background subtraction. The sensitivity for line gamma rays the 0.05-10 MeV region will be .00002 - 00003 photons/cc-s for a .000001-second observation period. The several modes of data acquisition and the emphases for the eplanned observational program are discussed.
Author: Fulvio Melia Publisher: Princeton University Press ISBN: 140083337X Category : Science Languages : en Pages : 392
Book Description
High-energy astrophysics involves the study of exceedingly dynamic and energetic phenomena occurring near the most extreme celestial objects known to exist, such as black holes, neutron stars, white dwarfs, and supernova remnants. High-Energy Astrophysics provides graduate and advanced undergraduate students with the most complete, self-contained introduction to the subject available. This textbook covers all the essentials, weaving together the latest theory with the experimental techniques, instrumentation, and observational methods astronomers use to study high-energy radiation from space. Fulvio Melia introduces topics at the forefront of today's research, including relativistic particles, energetic radiation, and accretion disk theory. No other textbook offers such a thorough yet concise treatment of the key aspects of high-energy astrophysics--both theoretical and observational--or delves as deeply into modern detection techniques, satellite systems, and analytical and numerical modeling used by theoreticians. Amply illustrated, High-Energy Astrophysics is also ideal for researchers interested in the application of fundamental physical laws to understand how matter and radiation behave in regions of the universe where physical conditions are most extreme. Uniquely weaves together the theoretical and experimental aspects of this important branch of astronomy Features stunning images of the high-energy sky Fully describes the principal classes of high-energy sources, with an in-depth study of many archetypal objects within them Provides an excellent, self-contained resource for the classroom, written by a preeminent researcher and teacher in the field
Author: S. Henninger Publisher: ISBN: Category : Languages : en Pages : 149
Book Description
The Final Report on the Oriented Scintillating Spectrometer Experiment (OSSE) is a reference document formatted in four parts to provide a concise summary of data covering the building and the testing of this Instrument. The main purpose of this document is to provide useful data for spacecraft integration activity. Most of the material is not original - it is pulled together from the more pertinent contents of the following categories: 1) description of OSSE, as specified, 2) construction data, and 3) test and measurements data, all drawn from design and test documentation. A fourth section, however, is drawn from original thinking on the subject of how OSSE might have been built and tested differently in order to achieve better results - the 'lessons learned section'. This final section will be more directed toward contributing to the improvement of future such programs, rather than contributing to spacecraft integration as significantly as the first three sections are intended to do.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Describes the Oriented Scintillation Spectrometer Experiment (OSSE) of the National Aeronautics and Space Administration (NASA), which is designed to take comprehensive observations of astrophysical sources in the 0.05-10 MeV energy range. Allows observations of a gamma-ray source to be alternated with observations of nearby background regions. Explains that OSSE has produced observations of the energy spectrum of nuclear lines in solar flares, the radioactive decay of nuclei in supernova remnants, and the signature of matter-antimatter annihilation in the galactic center region.
Author: S. Böhme Publisher: Springer Science & Business Media ISBN: 3662111845 Category : Science Languages : en Pages : 825
Book Description
Astronomy and Astrophysics Abstracts aims to present a comprehensive documen tation of the literature concerning all aspects of astronomy, astrophysics, and their border fields. It is devoted to the recording, summarizing, and indexing of the relevant publications throughout the world. Astronomy and Astrophysics Abstracts is prepared by a special department of the Astronomisches Rechen-Institut under the auspices of the International Astronomical Union. Volume 33 records literature published in 1983 and received before August 1, 1983. Some older documents which we received late and which are not surveyed in earlier volumes are included too. We acknowledge with thanks contributions of our colleagues all over the world. We also express our gratitude to all organizations, observatories, and publishers which provide us with complimentary copies of their publications. Starting with Volume 33, all the recording, correction, and data processing work was done by means of computers. The recording was done by our technical staff members Ms. Helga Ballmann, Ms. Mona El-Choura, Ms. Monika Kohl, and Ms. Sylvia Matyssek. Mr. Martin Schlotelburg and Mr. Ulrich Uberall supported our task by careful proofreading. It is a pleasure to thank them all for their encouragement. Heidelberg, September 1983 The Editors Contents Introduction . . . . . . . . . . . . 1 Concordance Relation: ICSU-AB-AAA 3 Abbreviations 10 Periodicals, Proceedings, Books, Activities 001 Periodicals . . . . . . . . . . . 15 002 Bibliographical Publications, Documentation, Catalogues, Atlases 47 003 Books ...... . 51 004 History of Astronomy 58 005 Biography . . 64 006 Personal Notes 65 007 Obituaries . . .
Author: Astronomisches Recheninstitut Publisher: Springer Science & Business Media ISBN: 3662123797 Category : Science Languages : en Pages : 1456
Book Description
"Astronomy and Astrophysics Abstracts" appearing twice a year has become oneof the fundamental publications in the fields of astronomy, astrophysics andneighbouring 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.
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Author: J. D. Kurfess
Author: Fulvio Melia
Author: S. Henninger
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Author: S. Böhme
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Author: Astronomisches Recheninstitut