The diffusive galactic GeV/TeV ramma-ray background: Sources vs. transport

Vo¨lk, Heinrich J.
June 2000
AIP Conference Proceedings;2000, Vol. 515 Issue 1, p281
Academic Journal
The diffuse Galactic γ-ray background, as observed with EGRET on CGRO, exceeds the model predictions significantly above 1 GeV. This is particularly true for the inner Galaxy. We shall discuss here the contribution of the Galactic Cosmic Ray (GCR) sources, considered as unresolved, and in addition the possibility that the transport of the GCRs out of the Galaxy is not uniform over the Galactic disk. In both cases the spectrum of the diffuse gamma rays is harder than the GCR spectrum in the neighborhood of the Solar system, as observed in situ. The source contribution is a necessary and, as it turns out, significant part of the diffuse background, whereas the transport effect is one of several conceivable additional causes for the hard diffuse γ-ray spectrum observed. © 2000 American Institute of Physics.


Related Articles

  • Dependence of the Position of the Knee in the Galactic Cosmic Ray Spectrum on the Explosion Energy Distribution of Supernovae. Sveshnikova, L. G. // Astronomy Letters;Jan2004, Vol. 30 Issue 1, p41 

    The position of the knee in the Galactic cosmic ray (GCR) spectrum is shown to depend on the explosion energy distribution function of supernovae (SN). The position of the knee in the GCR spectrum can be quantitatively explained by the dominating contribution of hypernovae with explosion...

  • The Extreme Energy Cosmic Rays. Tsunesada, Yoshiki // AIP Conference Proceedings;6/1/2010, Vol. 1238 Issue 1, p82 

    The present status of cosmic ray researches in the highest energy region (E>1018 eV) is reviewed. The latest experimental results up to 2009 are presented, including cosmic ray energy spectra, mass compositions and anisotropies in the arrival direction distributions.

  • Cosmic-Ray Plasma Coupling in the Outer Heliosphere. Lee, Martin A. // AIP Conference Proceedings;2004, Vol. 719 Issue 1, p353 

    The transport equation describing the coupling of cosmic rays to the heliospheric plasma is presented, together with an illustrative solution valid at high energies for the solar modulation of galactic cosmic rays (GCR) in both the solar wind and the heliosheath. The nonlinear backreaction of...

  • An Overview of the Origin of Galactic Cosmic Rays as Inferred from Observations of Heavy Ion Composition and Spectra. Wiedenbeck, M. E.; Binns, W. R.; Cummings, A. C.; Davis, A. J.; de Nolfo, G. A.; Israel, M. H.; Leske, R. A.; Mewaldt, R. A.; Stone, E. C.; von Rosenvinge, T. T. // Space Science Reviews;May2007, Vol. 130 Issue 1-4, p415 

    The galactic cosmic rays arriving near Earth, which include both stable and long-lived nuclides from throughout the periodic table, consist of a mix of stellar nucleosynthesis products accelerated by shocks in the interstellar medium (ISM) and fragmentation products made by high-energy...

  • Measurement of the flux of primary cosmic ray antiprotons with energies of 60 MeV to 350 GeV in the PAMELA experiment. Adriani, O.; Bazilevskaya, G.; Barbarino, G.; Bellotti, R.; Boezio, M.; Bogomolov, E.; Bonvicini, V.; Bongi, M.; Bonechi, L.; Borisov, S.; Bottai, S.; Bruno, A.; Vacchi, A.; Vannuccini, E.; Vasilyev, G.; Voronov, S.; Wu, J.; Galper, A.; Grishantseva, L.; Danilchenko, I. // JETP Letters;Jan2013, Vol. 96 Issue 10, p621 

    It is interesting to measure the antiproton galactic component in cosmic rays in order to study the mechanisms by which particles and antiparticles are generated and propagate in the Galaxy and to search for new sources of, e.g., annihilation or decay of dark matter hypothetical particles. The...

  • The Spectrum of Solar Cosmic Rays: Data of Observations and Numerical Simulation. Balabin, Yu. V.; Vashenyuk, É. V.; Mingalev, O. V.; Podgorny, A. I.; Podgorny, I. M. // Astronomy Reports;Oct2005, Vol. 49 Issue 10, p837 

    Analysis of the relativistic proton spectra of solar flares occurring in the 23rd solar activity cycle derived from data of a worldwide neutron monitor network and numerical modeling both provide evidence for the acceleration of charged particles by an electric field that arises in coronal...

  • The search for antimatter in cosmic rays. Bogomolov, �. A.; Vasil�ev, G. I.; Krut�kov, S. Yu.; Romanov, V. A.; Stepanov, S. V.; Shulakova, M. S. // Technical Physics;Sep99, Vol. 44 Issue 9, p1089 

    The search for antimatter in the universe is a page in the history of the Ioffe Physicotechnical Institute (IPTI). Experiments on spacecraft and high-altitude balloons, begun in the 1960s, yielded information on to the presence or absence of antimatter stars or galaxies according to evidence...

  • Galactic anisotropy as signature of �top-down� mechanisms of ultrahigh-energy cosmic rays. Dubovsky, S. L.; Tinyakov, P. G. // JETP Letters;7/25/98, Vol. 68 Issue 2, p107 

    We show that �top-down� mechanisms of ultrahigh-energy cosmic rays which involve heavy relic particle-like objects predict a Galactic anisotropy of the highest-energy cosmic rays at the level of minimum ~20%. This anisotropy is large enough to be either observed or ruled out in the...

  • Hunt for cosmic rays offers scope for Africa. Adam, David // Nature;9/5/2002, Vol. 419 Issue 6902, p6 

    Reports that astronomers are heading to Namibia for the opening of a gamma ray telescope. Use of the instrument to observe sources of galactic cosmic rays; Role of physics department at the University of Namibia in Windhoek in the project.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics