Constraining Galactic cosmic-ray parameters withZ ≤ 2 nuclei
نویسندگان
چکیده
منابع مشابه
Isotopic Composition of Galactic Cosmic Ray Nuclei
Galactic cosmic rays represent a directly accessible sample of matter that originates outside the solar system, The elemental and isotopic composition of this sample of high-energy matter contains a record of nucleosynthesis in other regions of the galaxy, and of subsequent nuclear and electromagnetic interactions that have altered its composition. There have recently been significant new advan...
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Active Galactic Nuclei (AGNs) are the most luminous objects in the Universe (besides Gamma-Ray Bursts). Typical spatial scales for these objects are estimated from time variability, giving sizes of around one parsec (Clavel al. 1991, Peterson et al. 1992), similar to our solar system, but with typical luminosities 1011 larger than the Sun. It is believed that their energy comes from the inflow ...
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We report high-resolution observations made in interplanetary space of 83-284 MeV per nucleon galactic cosmic-ray iron isotopes and directly establish that 56Fe is the dominant cosmic-ray Fe isotope. We find the following percentage abundances for Fe at the cosmic-ray source: 54Fe = 9(+8, -5)%, 55Fe:::; 7%, 56Fe = 91(+5, -11)%, 57Fe:::; 8%, and 58Fe:::; 6%. When compared to calculated nucleosyn...
متن کاملConstraining Galactic Neutrino Production in pγ Interactions with Cosmic Ray Electron and Positron Spectra
High energy neutrinos are expected to be produced inside astrophysical sources of cosmic rays e.g. supernova remnants, pulsar wind nebulae, active galactic nuclei and gamma-ray bursts by the decay of charged pions produced in pγ and pp interactions. Although pp interactions may be the dominant mechanism in our Galaxy, it is unclear how important pγ process is for neutrino production. We show th...
متن کاملConstraining Galactic pγ Interactions with Cosmic Ray Electron and Positron Spectra
High energy protons produced by various sources of cosmic rays, e.g., supernova remnants, pulsar wind nebulae, active galactic nuclei and gamma-ray bursts, participate in pγ and pp interactions. Although pp interactions may be the dominant mechanism in our Galaxy, it is unclear how important pγ process is. We show that the upper bound on the fraction of total number of protons participating in ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2012
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201117927