ABSTRACT
It is shown that the relativistic jets associated with the growth and past activity of the supermassive black hole in the Andromeda galaxy could be the main source of cosmic rays with ...energies above 1015 eV. Most of the cosmic ray energy is related to a bow shock of the jet that produces multi PeV cosmic rays with light composition. The highest energy cosmic rays with heavy composition are produced in the jet itself. The spectra of energetic particles produced in Andromeda galaxy and propagated to the Earth are calculated and compared with observations.
Acceleration of cosmic rays in astrophysical jets is investigated. Particles are accelerated at the outer bow shock and by shear flows in the jet cocoon. Applications for the origin and chemical ...composition of ultra-high-energy cosmic rays are discussed.
The propagation of ultrahigh-energy cosmic rays from nearby sources is studied. It is shown that the spectrum, chemical composition, and anisotropy observed at energies above 5 × 10
18
eV can be ...explained within the model of one nearby galaxy (M87) if the source is strongly enriched with heavy nuclei.
Abstract
Human keratinocytes HaCaT and human carcinoma cells A431 have been treated in vitro by a cold argon plasma jet with an average power value of 0.72 mW/cm
2
. There were made estimations of ...proliferation rate and cell viability in a day after the exposition. In contrast to the cell viability of both cell lines there were revealed significant differences in proliferation rates of keratinocytes and cancer cells after plasma treatment.
The inverse problem of cosmic ray transport of ultra-high energy cosmic rays is considered. The source spectrum and composition are derived based on the Auger data on energy spectrum, energy ...dependence of mean logarithm of atomic mass number and its variance. The regularization procedure for considered ill-posed problem and the statistical analysis of experimental data are employed.
The inverse problem of cosmic ray transport of ultra-high energy cosmic rays is considered. The source spectrum and composition are derived based on the recent Auger data on energy spectrum, energy ...dependence of mean logarithm of atomic mass number and its variance. The dependence of results on the extrapolation of observable spectrum beyond energies 10
20
eV is investigated.
A study is performed of the effect the cosmological evolution and spatial distribution of sources have on solving the inverse problem of determining the spectra of ultrahigh energy cosmic ray ...sources. The solution allows for the propagation and energy losses of protons and nuclei in the expanding Universe. It is established that active galactic nuclei are the most probable sources of ultrahigh energy cosmic rays.
We consider propagation of nuclei with energies over 10
18
eV in the expanding Universe filled with background electromagnetic radiation. The spectrum of sources of extragalactic cosmic rays for ...protons and nuclei up to iron is determined on the basis of the particle spectrum observed near Earth as a solution of the inverse problem of transfer of ultrarelativistic nuclei. The method of regularization of the solution of this mathematically ill-posed problem is used basing on the data of the Pierre Auger Observatory on the energy spectrum of cosmic rays, the average logarithm of the mass number, and its variance. The found energy spectra of the sources prove to be very hard and strongly dependent on the assumption about the composition of the accelerated nuclei.
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