نتایج جستجو برای: γ ray
تعداد نتایج: 371341 فیلتر نتایج به سال:
France Received ; accepted – 2 – ABSTRACT In this paper, the correlation between the γ-ray and the radio bands is investigated. The results show that there is a closer correlation between the γ-ray emission and the high frequency (1.3mm, 230GHz) radio emission for maximum data than between the γ-ray and the lower frequency (5GHz) radio emissions, which means that the γ-ray is associated with th...
Based on the γ-ray data of blazars in the third EGRET catalog and radio data at 5 GHz, we studied the correlation between the radio and γ-ray luminosities using two statistical methods. The first method was the partial correlation analysis method, which indicates that there exist correlations between the radio and γ-ray luminosities in both high and low states as well as in the average case. Th...
LS I +61 303 has been recently detected as a periodic γ-ray source by the Major Atmospheric Imaging Cerenkov (MAGIC) telescope. A distinctive orbital correlation of the γ-ray emission was found. This work shows that the range of uncertainties yet at hand in the orbital elements of the binary system LS I +61 303 as well as in the possible assumptions on the stellar wind of the optical companion ...
aluminum sulfate nano structures have been prepared by solution combustion synthesis using aluminum nitrate nonahydrate (al(no3)3.9h2o) and ammonium sulfate ((nh4)2so4). the resultant aluminum sulfate nano structures were calcined at different temperatures to study thermal decomposition of aluminum sulfate. the crystallinity and phase of the as-synthesized and calcined samples were characteri...
The Major Atmospheric Gamma-Ray Imaging Cherenkov Telescope very high energy (VHE) γ -ray astronomy collaboration recently reported the detection of the quasar 3C279 at > 100 GeV γ -ray energies. Here, we present simultaneous optical (BVRI) and X-ray (RXTE PCA) data from the day of the VHE detection and discuss the implications of the snapshot spectral energy distribution for jet models of blaz...
Cosmic ray protons interacting with gas at the mean density of the interstellar medium in starburst galaxies lose energy rapidly via inelastic collisions with ambient nuclei. The resulting pions produce secondary electrons and positrons, high-energy neutrinos, and γ-ray photons. We estimate the cumulative γ-ray emission from starburst galaxies and find a specific intensity at GeV energies of νI...
We report the Fermi Large Area Telescope detection of extended γ-ray emission from the lobes of the radio galaxy FornaxA using 6.1 years of Pass8 data. After CentaurusA, this is now the second example of an extended γ-ray source attributed to a radio galaxy. Both an extended flat disk morphology and a morphology following the extended radio lobes were preferred over a point-source descriptio...
We employ the Monte Carlo particle collision code DPMJET3.04 to determine the multiplicity spectra of various secondary particles (in addition to π 0 's) with γ's as the final decay state, that are produced in cosmic-ray (p's and α's) interactions with the interstellar medium. We derive an easy-to-use γ-ray production matrix for cosmic rays with energies up to about 10 PeV. This γ-ray productio...
the knoevenagel condensation of aromatic aldehydes with barbituric acid, dimedone and malononitrile occurred in the presence of bf3/nano-γ-al2o3 at room temperature in ethanol. this catalyst is characterized by powder x-ray diffraction (xrd), fourier transform infrared spectroscopy (ft-ir), thermal gravimetric analysis (tga), field emission scanning electron microscopy (fesem) and energy-disper...
ABSTRACT Introduction: Recently uses of medium and high energy x-rays has been increased in Iran and radiotherapy centers along with a variety of accelerators have been installed in some provinces. In the other hand there is no sufficient skill in designing and making radiotherapy treatment rooms. This study was conducted to evaluate the efficacy of different m...
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