A magnetic reconnection model for explaining the multi-wavelength emission of the microquasars Cyg X-1 and Cyg X-3
| Autor: | Behrouz Khiali, E. M. de Gouveia Dal Pino, M. V. del Valle |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Ciencias Físicas
Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Cosmic ray Astrophysics BURACOS NEGROS Cosmic ray acceleration purl.org/becyt/ford/1 [https] Acceleration Microquasars Radiative transfer Radiation mechanisms High Energy Astrophysical Phenomena (astro-ph.HE) Physics Non thermal mechanisms Astronomy Astronomy and Astrophysics Magnetic reconnection purl.org/becyt/ford/1.3 [https] Galaxy Astronomía Black hole Space and Planetary Science Spectral energy distribution Astrophysics - High Energy Astrophysical Phenomena CIENCIAS NATURALES Y EXACTAS Fermi Gamma-ray Space Telescope |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Recent studies have indicated that cosmic ray acceleration by a first-order Fermi process in magnetic reconnection current sheets can be efficient enough in the surrounds of compact sources. In this work, we discuss this acceleration mechanism operating in the core region of galactic black hole binaries (or microquasars) and show the conditions under which this can be more efficient than shock acceleration. In addition, we compare the corresponding acceleration rate with the relevant radiative loss rates obtaining the possible energy cut-off of the accelerated particles and also compute the expected spectral energy distribution (SED) for two sources of this class, namely Cygnus X-1 and Cygnus X-3, considering both leptonic and hadronic processes. The derived SEDs are comparable to the observed ones in the low and high energy ranges. Our results suggest that hadronic non-thermal emission due to photo-meson production may produce the very high energy gamma-rays in these microquasars. Comment: 17 pages and 7 figures. Accepted for publication in the Monthly Notices of the Royal Astronomical Society (MNRAS) |
| Databáze: | OpenAIRE |
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