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Gravitational lensing as a possible explanation for some unidentified gamma-ray sources at high latitudes
Diego F. Torres, Gustavo E. Romero, Ernesto F. Eiroa
We propose that some of the high-latitude unidentified EGRET gamma-ray sources could be the result of gravitational lensing amplification of the innermost regions of distant, faint…
Is the Supernova Remnant RX J1713.7-3946 a Hadronic Cosmic Ray Accelerator ?
Yousaf M. Butt, Diego F. Torres, Jorge A. Combi +2
The non-thermal supernova remnant RX J1713.7-3946 (G347.3-0.5) has recently been shown to be a site of cosmic ray (CR) electron acceleration to TeV energies (Muraishi et al. 2000).…
Variable gamma-ray emission from the Be/X-ray transient A0535+26?
Gustavo E. Romero, M. M. Kaufman Bernado, Jorge A. Combi +1
We present a study of the unidentified gamma-ray source 3EG J0542+2610. This source is spatially superposed to the supernova remnant G180.0-1.7, but its time variability makes unli…
The Mysterious Ultrahigh Energy Cosmic Ray Clustering
Luis A. Anchordoqui, Haim Goldberg, Stephen Reucroft +3
We examine the correlation between compact radio quasars (redshifts in the range ) and the arrival direction of ultrahigh energy cosmic rays forming clusters. Our Mo…
A Study of the Unidentified Gamma-Ray Source 3EG J1828+0142
Jorge A. Combi, Gustavo E. Romero, Diego F. Torres +1
We present a study of the radio environment of the gamma-ray source 3EG J1828+0142. This source presents a very high variability index in its gamma emission and a steep high-energy…
Macrolensing signatures of large-scale violations of the weak energy condition
Margarita Safonova, Diego F. Torres, Gustavo E. Romero
We present a set of simulations of the macrolensing effects produced by large-scale cosmological violations of the energy conditions. These simulations show how the appearance of a…
Variable Unidentified Gamma-Ray Sources Near the Galactic Plane
Gustavo E. Romero, Diego F. Torres, P. Benaglia +2
In a recent paper, Romero et al. (1999) have presented the results of a positional correlation analysis of the low-latitude unidentified gamma-ray sources in the Third EGRET catalo…