Leptonic secondary emission in a hadronic microquasar model

Authors
Orellana, Mariana D.; Bordas, Pol; Bosch Ramon, Valentí; Romero, Gustavo E.; Paredes, Josep M.
Publication Year
2007
Language
English
Format
article
Status
Versión aceptada para publicación
Description
Fil: Orellana, Mariana D. Universidad Nacional de Río Negro; Argentina
Fil: Orellana, Mariana D. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Orellana, Mariana D. Instituto Argentino de Radioastronomia; Argentina
Fil: Bordas, Pol. Universidad de Barcelona; España
Fil: Bosch Ramon, Valentí. Max Planck Institut für Kernphysik; Alemania
Fil: Romero, Gustavo E. Comisión de Investigaciones Científicas; Argentina
Fil: Romero, Gustavo E. Instituto Argentino de Radioastronomia; Argentina
Fil: Romero, Gustavo E. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Paredes, Josep M. Universidad de Barcelona; España
Context. It has been proposed that the origin of the very high-energy photons emitted from high-mass X-ray binaries with jet-like features, so-called microquasars (MQs), is related to hadronic interactions between relativistic protons in the jet and cold protons of the stellar wind. Leptonic secondary emission should be calculated in a complete hadronic model that include the effects of pairs from charged pion decays inside the jets and the emission from pairs generated by gamma-ray absorption in the photosphere of the system. Aims. We aim at predicting the broadband spectrum from a general hadronic microquasar model, taking into account the emission from secondaries created by charged pion decay inside the jet. Methods. The particle energy distribution for secondary leptons injected along the jets is consistently derived taking the energy losses into account. We also compute the spectral energy distribution resulting from these leptons is calculated after assuming different values of the magnetic field inside the jets. The spectrum of the gamma-rays produced by neutral pion-decay and processed by electromagnetic cascades under the stellar photon field. Results. We show that the secondary emission can dominate the spectral energy distribution at low energies ( ∼ 1 MeV). At high energies, the production spectrum can be significantly distorted by the effect of electromagnetic cascades. These effects are phase-dependent, and some variability modulated by the orbital period is predicted.
Subject
Radiation Mechanisms
Gamma Rays
Binary Stars
.::Ciencias Exactas y Naturales::Ciencias Físicas
Access level
Open access
License
https://creativecommons.org/licenses/by-nc-sa/4.0/
Repository
RID-UNRN (UNRN)
Institution
Universidad Nacional de Río Negro
OAI Identifier
oai:rid.unrn.edu.ar:20.500.12049/2827