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Rayos X polarizados de un magnetar

Roberto Taverna1, Roberto Turolla1,2, Fabio Muleri3

  • 1Department of Physics and Astronomy, University of Padova, I-35131 Padova, Italy.

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Resumen
Este resumen es generado por máquina.

Las observaciones de rayos X polarizadas revelan que el magnetar 4U 0142+61 tiene un campo magnético complejo. La polarización varía con la energía, lo que sugiere la dispersión de la radiación en la magnetosfera del magnetar.

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Área de la Ciencia:

  • La astrofísica
  • Astrofísica de alta energía
  • Investigación de estrellas de neutrones

Sus antecedentes:

  • Los magnetares son estrellas de neutrones caracterizadas por campos magnéticos muy potentes.
  • Las observaciones de rayos X son cruciales para estudiar las propiedades del magnetar.
  • Las mediciones de polarización ofrecen información sobre los campos magnéticos y las características de la superficie.

Objetivo del estudio:

  • Para investigar la polarización de los rayos X emitidos por el magnetar 4U 0142+61.
  • Para determinar el grado y la dependencia de energía de la polarización de rayos X de este magnetar.
  • Para probar los modelos de los mecanismos de emisión de magnetares.

Principales métodos:

  • Utilizó el explorador de polarimetría de rayos X de imágenes (IXPE) para las observaciones.
  • Se midió el grado de polarización lineal y el ángulo de los rayos X de 4U 0142+61.
  • Analizó la polarización a través de la banda de energía de 2 a 8 kilovoltios.

Principales resultados:

  • Se detectó un grado de polarización lineal significativo de 13,5 ± 0,8% con un promedio de 2-8 keV.
  • Polarización dependiente de la energía observada: 15,0 ± 1,0% (2-4 keV), polarización baja (~ 4-5 keV) y 35,2 ± 7,1% (5,5-8 keV).
  • Se registró un cambio de ángulo de polarización de 90° alrededor de 4-5 keV.

Conclusiones:

  • Las propiedades de polarización observadas son consistentes con la radiación térmica de la superficie.
  • La dispersión de partículas cargadas dentro de la magnetosfera del magnetar probablemente vuelve a procesar la radiación.
  • Estos hallazgos apoyan los modelos que involucran interacciones de partículas magnetosféricas en la emisión magnetar.