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Emisión polarizada de rayos gamma del agujero negro galáctico Cygnus X-1
P Laurent1, J Rodriguez, J Wilms
1Astroparticules et Cosmologie (APC), Commissariat à l'Energie Atomique et aux Énergies Alternatives, Institut de Recherche sur les Lois Fondamentales de l'Univers (CEA/IRFU), 10, rue Alice Domon et Léonie Duquet, 75205, Paris Cedex 13, France. plaurent@cea.fr
Science (New York, N.Y.)
|March 26, 2011
Resumen
Los estudios de polarización de los binarios de rayos X de agujeros negros como Cygnus X-1 revelan mecanismos de emisión distintos. Los datos de rayos gamma muestran una polarización débil de la dispersión de Compton y una fuerte polarización de la emisión de MeV, probablemente vinculada al chorro del sistema.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Astrofísica de altas energías de alta energía.
- Física de los agujeros negros.
Sus antecedentes:
- Los binarios de rayos X de los agujeros negros ofrecen un alto flujo para estudios de polarización.
- Las mediciones anteriores de polarización de estos sistemas carecían de ellas.
- La comprensión de los mecanismos de emisión es crucial para la investigación binaria de agujeros negros.
Objetivo del estudio:
- Para medir la polarización de rayos gamma del sistema binario del agujero negro Cygnus X-1.
- Para investigar los mecanismos de emisión responsables de la radiación observada.
- Explorar los vínculos potenciales entre las diferentes emisiones de la banda de energía y la actividad de los jets.
Principales métodos:
- Utilizó el Imager del Laboratorio Internacional de Astrofísica de Rayos Gamma a bordo del telescopio Integral de Satélite (INTEGRAL/IBIS).
- Se midió la polarización de la emisión de rayos gamma de Cygnus X-1.
- Se realizó el modelado espectral de los datos recopilados.
Principales resultados:
- Se identificaron dos mecanismos de emisión distintos dentro de Cygnus X-1.
- La emisión de 250 a 400 keV (kiloelectronvoltios) mostró una polarización débil, consistente con la dispersión de Compton.
- La emisión de 400 keV a 2 MeV (megaelectronvoltios) estaba fuertemente polarizada, lo que sugiere un origen relacionado con el chorro.
Conclusiones:
- La emisión de MeV en Cygnus X-1 está probablemente asociada con el chorro de radio previamente detectado.
- Las mediciones de polarización proporcionan información clave sobre los complejos procesos de emisión en binarios de agujeros negros.
- Este estudio abre nuevas vías para comprender la aceleración de partículas y la radiación en entornos astrofísicos extremos.
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