Gamma-ray absorption in the microquasar SS433 |
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| Authors: | MM Reynoso HR Christiansen GE Romero |
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| Institution: | 1. Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350, (7600) Mar del Plata, Argentina;2. State University of Ceará, Physics Department, Av. Paranjana 1700, 60740-000 Fortaleza-CE, Brazil;3. Instituto Argentino de Radioastronomía, CONICET, C.C.5, (1894) Villa Elisa, Buenos Aires, Argentina;4. Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque, 1900 La Plata, Argentina |
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| Abstract: | We discuss the gamma-ray absorption in the inner region of the microquasar SS433. Our investigation includes several contributions to the opacity of this system. They result from the ambient fields generated by the primary star, possibly an A-type supergiant, and a very extended disk around the black hole. Besides the sharp and dramatic absorption effect that occurs every time the star crosses the emission zone, we find in the UV photon field from the extended disk an important source of absorption for very high energy gamma-rays. This results in periodic gamma-ray observational signatures. |
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| Keywords: | Gamma-rays: theory X-rays: binaries Radiation mechanisms: non-thermal Stars: winds outflows |
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