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Inversión del campo magnético en el entorno turbulento alrededor de una repetida ráfaga de radio rápida
Reshma Anna-Thomas1,2, Liam Connor3,4, Shi Dai5,6,7
1Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA.
Science (New York, N.Y.)
|May 11, 2023
Resumen
Las observaciones de repetidas ráfagas rápidas de radio (FRB) revelan un campo magnético altamente variable cerca de la fuente. Esto sugiere que los FRB se propagan a través de una pantalla de plasma magnetizado turbulento, posiblemente de un compañero binario.
Área de la Ciencia:
- La astrofísica
- La radioastronomía
Sus antecedentes:
- Las ráfagas rápidas de radio (FRB) son intensos, breves destellos de ondas de radio de fuentes extragalácticas.
- Las FRB polarizadas indican su origen en ambientes altamente magnetizados.
Objetivo del estudio:
- Para investigar el entorno de la repetición FRB 20190520B durante 17 meses.
- Para entender la causa de las variaciones de rotación de Faraday observadas en los FRB.
Principales métodos:
- Monitoreo a largo plazo del FRB 20190520B repetitivo.
- Análisis de las propiedades de polarización del FRB, incluida la rotación de Faraday y la despolarización.
Principales resultados:
- Se observó una rotación de Faraday muy variable de FRB 20190520B, incluidas las inversiones de señal.
- Detectado despolarización de la FRB por debajo de 1-3 GHz.
- Los resultados se interpretarán como cambios en el componente de campo magnético de la línea de visión.
Conclusiones:
- El entorno FRB probablemente contiene una turbulenta pantalla de plasma magnetizado.
- Esta pantalla puede estar ubicada a 10^-5 parsecs de la fuente.
- La pantalla es consistente con el viento estelar de un compañero binario a la fuente FRB.
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