An inhomogeneous lepto-hadronic model for the radiation of relativistic jets. Application to XTE J1118+480

Abstract

Conceptually reconstructing the physical conditions in relativistic jets, given the observed electromagnetic spectrum, poses a complex inverse problem. We aim to obtain a better understanding of the mechanisms operating in relativistic jets through the modeling of their broadband electromagnetic spectrum. We develop an inhomogeneous jet model where the injection of relativistic primary and secondary particles takes place in a spatially extended region. We calculate the contribution of all particles species to the jet emissivity due to several processes, and assess the effect of gamma-ray absorption in internal and external photon fields. A number of specific models with different parameters are computed to explore the possibilities of this scenario. We obtain a variety of spectral shapes depending on the model parameters, some of them predicting significant gamma-ray emission. The observed broadband spectrum of the low-mass microquasar XTE J1118+480 can be satisfactorily reproduced by the model. Our results indicate that outbursts similar to those displayed in the past by XTE J1118+480 might be detected with present-day gamma-ray instruments.

12 pages, 9 figures, accepted for publication in Astronomy & Astrophysics. Language edition and updated references

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• New constraints on the structure and dynamics of black hole jets
• Constraints on Relativistic Jets in Quiescent Black Hole X-ray Binaries from Broadband Spectral Modeling
• Lepto-hadronic model for the broadband emission of Cygnus X-1
• Positrons from Primordial Black Hole Microquasars and Gamma-ray Bursts
• Particle transport in magnetized media around black holes and associated radiation
• Coronal origin of the polarization of the high-energy emission of Cygnus X-1
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