Results 291 to 300 of about 712,854 (335)
Some of the next articles are maybe not open access.
Annual Review of Astronomy and Astrophysics, 1983
In Volume 5 of the Annual Review of Astronomy and Astrophysics (1967) Giovanni Fazio (76a) wrote that "... up until now, no photons of energy greater than 100 keV originating from beyond the solar system have definitely been detected." Fourteen years later, gamma-ray astronomy is an accepted branch of observational astrophysics, with something like 105
G. F. Bignami, W. Hermsen
openaire +3 more sources
In Volume 5 of the Annual Review of Astronomy and Astrophysics (1967) Giovanni Fazio (76a) wrote that "... up until now, no photons of energy greater than 100 keV originating from beyond the solar system have definitely been detected." Fourteen years later, gamma-ray astronomy is an accepted branch of observational astrophysics, with something like 105
G. F. Bignami, W. Hermsen
openaire +3 more sources
Space Science Reviews, 1983
Various models are examined, which could give rise to point-like gamma-ray sources, at the present time indistinguishable, experimentally, from true point sources. These models involve energetic processes associated with interstellar clouds, e.g. supernova-cloud interactions, neutron star accretion inside interstellar clouds, cloud collisions, etc. The
G. E. Morfill, G. Tenorio-Tagle
openaire +1 more source
Various models are examined, which could give rise to point-like gamma-ray sources, at the present time indistinguishable, experimentally, from true point sources. These models involve energetic processes associated with interstellar clouds, e.g. supernova-cloud interactions, neutron star accretion inside interstellar clouds, cloud collisions, etc. The
G. E. Morfill, G. Tenorio-Tagle
openaire +1 more source
Proceedings of the Indian Academy of Sciences - Section A, 1971
Gamma-ray production by particles escaping from a pulsar into the surrounding nebula is considered. The gamma-ray emission decreases with time and such pulsar-nebula complexes will be observed as transient sources.
Krishna M. V. Apparao, T. N. Rengarajan
openaire +1 more source
Gamma-ray production by particles escaping from a pulsar into the surrounding nebula is considered. The gamma-ray emission decreases with time and such pulsar-nebula complexes will be observed as transient sources.
Krishna M. V. Apparao, T. N. Rengarajan
openaire +1 more source
AIP Conference Proceedings, 2001
Several TeV sources γ-rays have been detected in the past decade, and others have been proposed. They can be divided into three main categories: galactic, extra-galactic, and exotic. Here I review the two former categories, which contain the sources which have been observed, with discussions of the source characteristics and the physical mechanisms by ...
openaire +2 more sources
Several TeV sources γ-rays have been detected in the past decade, and others have been proposed. They can be divided into three main categories: galactic, extra-galactic, and exotic. Here I review the two former categories, which contain the sources which have been observed, with discussions of the source characteristics and the physical mechanisms by ...
openaire +2 more sources
Gamma-ray bursts as cool synchrotron sources
Nature Astronomy, 2018Gamma-ray bursts (GRBs) are the most energetic electromagnetic sources in the Universe, releasing 10 42 –10 47 J (refs. 1 , 2 ) in prompt gamma-ray radiation.
J. Burgess +9 more
semanticscholar +1 more source
Directional Detector of Gamma Ray Sources
Health Physics, 1996This work describes the design, development, and characterization of an ionization chamber to detect and locate gamma ray sources with intensities down to 100 mu Gy h(-1). The results show that sources of x ray and gamma radiation in the energy range of 14 to 1,250 keV can be located.
S, Kronenberg +3 more
openaire +2 more sources
Il Nuovo Cimento C, 2010
The quiet Sun, the Moon, the Earth and other Solar System objects are sources of high-energy gamma rays. The emission is produced by interactions of Galactic cosmic rays: by nucleons in the surface and atmosphere of the sources via hadronic interactions, and by electrons on solar photons in the heliosphere via inverse Compton scattering. Both emissions
openaire +2 more sources
The quiet Sun, the Moon, the Earth and other Solar System objects are sources of high-energy gamma rays. The emission is produced by interactions of Galactic cosmic rays: by nucleons in the surface and atmosphere of the sources via hadronic interactions, and by electrons on solar photons in the heliosphere via inverse Compton scattering. Both emissions
openaire +2 more sources
Science, 2000
Relativistic outflows or "jets" are collimated streams of high-energy electrons that emit synchrotron radiation at radio wavelengths and have bulk velocities that are a substantial fraction of the speed of light. They trace the outflow of enormous amounts of energy and matter from a central supermassive black hole in distant radio galaxies.
openaire +2 more sources
Relativistic outflows or "jets" are collimated streams of high-energy electrons that emit synchrotron radiation at radio wavelengths and have bulk velocities that are a substantial fraction of the speed of light. They trace the outflow of enormous amounts of energy and matter from a central supermassive black hole in distant radio galaxies.
openaire +2 more sources
Gamma-ray sources and equipment
1982In 1896 Becquerel discovered that certain of the heavier elements emitted penetrating radiation and were unstable; the earlier concept that elements represented the most stable form of matter had therefore to be abandoned. There are three radioactive series known in nature, the parent elements of which are uranium-238, uranium-235 and thorium-232. Each
openaire +1 more source
2004
The EGRET telescope has detected over 200 γ-ray sources above 100 MeV, but many remain unidentified because of their poor localization or their faintness at lower energies. Multi-wavelength searches have proved successful at finding interesting blazar and pulsar counterparts at high latitudes, but rarely in the Galactic plane because of confusion. Yet,
openaire +1 more source
The EGRET telescope has detected over 200 γ-ray sources above 100 MeV, but many remain unidentified because of their poor localization or their faintness at lower energies. Multi-wavelength searches have proved successful at finding interesting blazar and pulsar counterparts at high latitudes, but rarely in the Galactic plane because of confusion. Yet,
openaire +1 more source