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Author: Publisher: ISBN: Category : Languages : en Pages : 15
Book Description
The discovery of gamma-ray line emission in the 3-7 MeV range from the Orion complex was recently reported (Bloemen et al. 1994). The observed Compton Telescope (COMPTEL) spectrum suggested that the emission results from the de-excitation of excited states of 12C and 16O. We report on a search for these lines using the Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Gamma Ray Observatory (CGRO) during a 5-week observation from April to June in 1995. The OSSE detectors were pointed midway between the Orion A and B radio sources in three different viewing configurations. We find no compelling evidence for line emission near 4.4 or 6.1 MeV. The sensitivity of the OSSE measurements is dependent on the widths of the reported C and O lines and on the source location and spatial extent. A point source at the flux level reported by COMPTEL and located on-axis would have been detected by OSSE at ~7 sigma and ~5 sigma levels of confidence for narrow and broad lines, respectively. A spatially-distributed source of the same strength with a distribution following the intense CO emission localized around Orion A and Orion B (see Maddalena et al. 1986) would have been detected by OSSE at ~3.5 sigma and ~2.5 sigma, respectively. Thus, these OSSE observations require that any gamma-ray line source must be even more extended to be consistent with the reported COMPTEL intensity.
Author: Publisher: ISBN: Category : Languages : en Pages : 15
Book Description
The discovery of gamma-ray line emission in the 3-7 MeV range from the Orion complex was recently reported (Bloemen et al. 1994). The observed Compton Telescope (COMPTEL) spectrum suggested that the emission results from the de-excitation of excited states of 12C and 16O. We report on a search for these lines using the Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Gamma Ray Observatory (CGRO) during a 5-week observation from April to June in 1995. The OSSE detectors were pointed midway between the Orion A and B radio sources in three different viewing configurations. We find no compelling evidence for line emission near 4.4 or 6.1 MeV. The sensitivity of the OSSE measurements is dependent on the widths of the reported C and O lines and on the source location and spatial extent. A point source at the flux level reported by COMPTEL and located on-axis would have been detected by OSSE at ~7 sigma and ~5 sigma levels of confidence for narrow and broad lines, respectively. A spatially-distributed source of the same strength with a distribution following the intense CO emission localized around Orion A and Orion B (see Maddalena et al. 1986) would have been detected by OSSE at ~3.5 sigma and ~2.5 sigma, respectively. Thus, these OSSE observations require that any gamma-ray line source must be even more extended to be consistent with the reported COMPTEL intensity.
Author: Volker Schönfelder Publisher: Springer Science & Business Media ISBN: 3662045931 Category : Science Languages : en Pages : 418
Book Description
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.
Author: Reinhard Schlickeiser Publisher: Springer Science & Business Media ISBN: 3662048140 Category : Science Languages : en Pages : 521
Book Description
In the first part, the book gives an up-to-date summary of the observational data. In the second part, it deals with the kinetic description of cosmic ray plasma. The underlying diffusion-convection transport equation, which governs the coupling between cosmic rays and the background plasma, is derived and analyzed in detail. In the third part, several applications of the solutions of the transport equation are presented and how key observations in cosmic ray physics can be accounted for is demonstrated.
Author: Mezzacappa Publisher: CRC Press ISBN: 9780750305556 Category : Science Languages : en Pages : 768
Book Description
Bringing together atomic physicists, nuclear physicists, astronomers, and astrophysicists from around the world, Stellar Evolution, Stellar Explosions, and Galactic Chemical Evolution focuses on stellar atmospheres; stellar evolution; stellar explosions, such as novae, supernovae, and x-ray bursters; pregalactic and galactic chemical evolution; the interstellar medium; and atomic and nuclear data for astrophysics. Consisting of invited papers, invited posters, and contributed posters, this volume covers observations, modeling, and atomic and nuclear physics foundations, including data, experiments, and theories, that are essential to understanding these important astrophysical objects and events. It documents a confluence of atomic physics, nuclear physics, and astrophysics and a confluence of data from atomic and nuclear physics experiments from current-generation astronomical instruments-all have helped advance the frontier in our understanding of the universe.
Author: Heinrich J. Völk Publisher: Springer Science & Business Media ISBN: 9400901712 Category : Science Languages : en Pages : 447
Book Description
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.
Author: Maurizio Busso Publisher: A I P Press ISBN: Category : Science Languages : en Pages : 664
Book Description
Annotation The July 1994 symposium was an international forum in which scientists working in different research branches connected to nucleosynthesis could discuss the most recent achievements in nuclear astrophysics. The topics addressed range from laboratory work of nuclear astrophysics, especially on reaction rates, to models of nucleosynthesis in single and double stars; from measurements of abundances and isotopic anomalies in pristine meteorites to the reconstruction of the early evolutionary phases of the Solar System; and from optical and radio spectroscopic studies of the composition in stellar atmospheres and circumstellar envelopes to modeling of the global chemical evolution of galaxies. No subject index. Annotation c. by Book News, Inc., Portland, Or.
Author: İbrahim Küçük Publisher: BoD – Books on Demand ISBN: 953510473X Category : Science Languages : en Pages : 412
Book Description
This book provides readers with a clear progress to theoretical and observational astrophysics. It is not surprising that astrophysics is continually growing because very sophisticated telescopes are being developed and they bring the universe closer and make it accessible. Astrophysics Book presents a unique opportunity for readers to demonstrate processes do occur in Nature. The unique feature of this book is to cover different aspects in astrophysics covering the topics: • Astronomy • Theoretical Astrophysics • Observational Astrophysics • Cosmology • The Solar System • Stars • Planets • Galaxies • Observation • Spectroscopy • Dark Matter • Neutron Stars • High Energy Astrophysics
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Author: Volker Schönfelder
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Author: Reinhard Schlickeiser
Author: Mezzacappa
Author: Heinrich J. Völk
Author: Maurizio Busso
Author: R. Ramaty
Author: İbrahim Küçük
Author: