• G. E. Romero

      Articles written in Journal of Astrophysics and Astronomy

    • Praface

      J. H. Fan G. E. Romero Z. Shen A. C. Gupta Y. Liu

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    • Models for High-Energy Radiation from Blazars

      G. E. Romero M. M. Reynoso

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      We discuss on the modelling of blazar jets as emitters of multiwavelength radiation with the implementation of a lepto-hadronic treatment. Assuming that injection of non-thermal electrons and protons can take place at the base of the jet, the stationary particle distributions can be found using an inhomogeneous one-dimensional transport equation with cooling and convection. The goal of this approach is to replace the widely used one-zone purely leptonic approximation by a more realistic model. We argue that the rapid variability observed in emission from blazars can be obtained as a result of interaction of the jet with obstacles, i.e., molecular clouds and stars. Long term variability is likely related to changes in the injection and physical conditions in the acceleration region.

    • Models for Very Rapid High-Energy 𝛾-Ray Variability in Blazars

      G. E. Romero M. M. Reynoso

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      We present a family of models for rapid 𝛾-ray variability in blazars based on a two-component jet. Fast variability occurs when relativistic electron–positron pairs interact with small-scale perturbations in the inner jet. These perturbations are produced by Kelvin–Helmholtz instabilities. We fit the minute-scale strong variability displayed by the blazar PKS 2155−304 and present synthetic light-curves of the kind that might be observed with forthcoming instruments such as the Cherenkov telescope array.

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