We model rapid variability of multifrequency emission from blazars occurring across the electromagnetic spectrum (from radio to gamma rays). Lower energy emission is produced by the synchrotron mechanism, whereas higher energy emission is due to inverse Compton scattering of the synchrotron emission. We take into account energy stratification established by particle acceleration at shock fronts...

The Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT) is the first realization of a liquid xenon time projection chamber for Compton imaging of MeV γ-ray sources in astrophysics. By measuring the energy deposit and the three spatial coordinates of individual γ-ray scattering points, the location of the source in the sky is inferred with Compton kinematics reconstruction. The angular resolution...

ABSTRACT Multiwavelength observation of the gamma-ray burst, GRB 190114C, opens a new window for studying emission mechanism afterglows. Its very high energy (VHE; ≳ 100 GeV) detection has motivated an inverse Compton interpretation emission, but this not been tested. Here, we revisit early afterglow from 68 to 180 s and perform modelling likelihood analysis with keV TeV data sets. We compute f...

We are developing a Compton telescope based on high resolution Si and CdTe imaging devices in order to obtain a high sensitivity astrophysical observation in sub-MeV gamma-ray region. In this paper, recent results from the prototype Si/CdTe semiconductor Compton telescope are reported. The Compton telescope consists of a double-sided Si strip detector (DSSD) and CdTe pixel detectors, combined w...

We consider the azimuthal angle dependence in the cross section of the hard leptoproduction of a photon on a nucleon target. We show that this dependence allows to define observables that isolate the twist-two and twist-three sectors in the deeply virtual Compton scattering amplitude. All twist-two and twist-three Compton form factors can be extracted from measurements of the charge odd part of...

Several hotspots of FRII radio sources have previously been detected in the X-ray at a flux level consistent with the X-rays being due to inverse-Compton scattering of radio “synchrotron photons synchrotron self-Compton”, if the magnetic fields in the hotspots are close to their equipartition values. However, the number of hotspots compact and bright enough to exhibit detectable X-ray emission ...

The amplitudes for virtual Compton scattering o protons are calculated within the framework of the diquark model in which protons are viewed as being built up by quarks and diquarks. The latter objects are treated as quasi-elementary constituents of the proton. Virtual Compton scattering, electroproduction of photons and the Bethe-Heitler contamination are discussed for various kinematical situ...

a more detailed analysis is made of the energy spectrum of the diffuse component of extragalactic gamma rays over the range of 0.3- 10 gev, obtained fromthe egret instrument at the compton gamma ray observatory. the derived excess energy spectrum of high galactic latitude, b > 60°, using intercept method shows that it is correlated with virgo cluster (over lsr) and average virgo intensity is ab...

C66 We have measured the spin-polarized electron momentum density distributions (magnetic Compton profiles) of UGe2 using the synchrotron-based magnetic Compton scattering technique. The spin moment of UGe2 has been determined as -1.15 μB at 10 K with an applied magnetic field of 0.5 T. Compared with the saturated magnetization of +1.40 μB, we have determined the orbital moment at +2.55 μB. The...

We developed a non-linear Monte Carlo code based on the LP method proposed by Stern et al (1995). We use it to simulate an extended non-thermal X/γ ray source coupled with a cold accretion disk. The source radiates by inverse Compton process. We show that very low optical depths (τ ∼ 5.10 −4) are required for the 2nd Compton order to be negligible. Such optical depths can be reached only if the...