Figure 3 - uploaded by D. Ruffolo
Content may be subject to copyright.
Source publication
A giant e+/- pair halo is formed by electromagnetic cascades
developing around an AGN under the intergalactic magnetic field (1nG -
1μG). Many studies have been focussed on the pair halos in the gamma
band because it has been predicted that the e+/-s in the pair
halos up-scatter the Cosmic Microwave Background (CMB) to be gamma-rays.
However, the p...
Context in source publication
Context 1
... results in Fig. 3 and Fig. 4 show that when the intrinsic gamma energy, E 0 , increased, the SED extended to higher energy, more energy flux contained in higher energy band, but remain the same level in lower energy band. Interestingly, the angular distributions were sensitive to the intrinsic gamma energy between 100 -500 ...
Similar publications
Indus-2 is a 2.5 GeV electron storage ring and a national facility for synchrotron radiation users in India providing the photon beam in round the clock mode. Recently, the electron beam emittance of Indus-2 was reduced to one third of the normal operating optics (130 nm rad) with improved beam optics. Due to this reduced emittance, likelihood of f...
Citations
An electron/positron pair halo is formed by electromagnetic cascades that initiate when high energy gamma-rays from extragalactic sources - i.e. Blazar AGN - interact with the cosmic infrared background (CIB), and are then absorbed via the electron/positron pair production process. The high energy electron/positron pairs produced could up-scatter the cosmic microwave background (CMB) and become gamma rays which can interact with CIB again. Thus, the process could happen continuously until the produced gamma-rays have insufficient energy to interact with the CIB. Indeed, given the presence of intergalactic magnetic field, the produced electron/positron pairs could gyrate before scattered with the CMB photons so that they emit X-ray photons via the synchrotron radiation process. In this work, we determine whether the predicted X-ray photons emitted from the halo can be detected by the current generation X-ray observatory: XMM-Newton. The Spectral Energy Distributions (SEDs) of the synchrotron radiation of the pair halo predicted to be obtained from the AGN H1426+428 are simulated by the Monte Carlo simulations method; these are used as a source model for simulating observed spectra. The spectra of the halo virtually observed by XMM-Newton are generated in three different regions: the inner region, outer region and the region out of the XMM-Newton's field of view. The resulting spectra suggest that the outer region spectra could provide the best opportunity to detect and confirm the existence of electron/positron pair halos.
