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Los rayos X polarizados restringen la geometría del chorro de disco en el binario de rayos X del agujero negro Cygnus
Henric Krawczynski1, Fabio Muleri2, Michal Dovčiak3
1Department of Physics and McDonnell Center for the Space Sciences, Washington University in St. Louis, St. Louis, MO 63130, USA.
Science (New York, N.Y.)
|November 10, 2022
Resumen
Las observaciones polarimétricas del binario de rayos X del agujero negro (BHXB) Cygnus X-1 revelan que su chorro se alinea con el campo eléctrico. Esto sugiere que el chorro se origina en la región interna emisora de rayos X, con plasma extendido perpendicular al eje del chorro.
Área de la Ciencia:
- La astrofísica
- Astrofísica de alta energía
- Física de los agujeros negros
Sus antecedentes:
- Los binarios de rayos X de agujero negro (BHXB) son sistemas donde el gas de una estrella normal se acumula en un agujero negro, generando rayos X.
- Comprender la geometría y los mecanismos de emisión de BHXB es crucial para la física de los agujeros negros.
Objetivo del estudio:
- Para investigar la estructura y el origen del chorro en el agujero negro binario de rayos X (BHXB) Cygnus X-1.
- Para determinar la distribución espacial del plasma caliente que emite rayos X en relación con el chorro.
Principales métodos:
- Utilizó observaciones polarimétricas de Cygnus X-1 con el Explorador de polarimetría de rayos X de imágenes (IXPE).
- Analizó el ángulo de posición del campo eléctrico y el grado de polarización de las emisiones de rayos X.
Principales resultados:
- Se encontró que el ángulo de posición del campo eléctrico se alinea con el chorro de salida.
- Se midió un grado de polarización de 4,01 ± 0,20% entre 2 y 8 kiloelectronvoltios.
- Es probable que el disco de acreción se vea más cerca del borde que la órbita binaria.
- El plasma caliente que emite rayos X se extiende espacialmente en un plano perpendicular al eje del chorro.
Conclusiones:
- El chorro en Cygnus X-1 se lanza desde la región interna emisora de rayos X.
- La orientación del disco de acreción está limitada por las mediciones de polarización.
- Se revela que la geometría del plasma caliente es plana y perpendicular al chorro.
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