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Observación de rayos gamma pulsados por encima de 25 GeV desde el púlsar Crab con MAGICIC
, E Aliu, H Anderhub
Science (New York, N.Y.)
|October 18, 2008
Resumen
Los investigadores detectaron rayos gamma de alta energía del púlsar Crab utilizando el telescopio MAGIC. Este hallazgo sugiere que la emisión del púlsar se origina lejos de la estrella, lo que desafía las teorías existentes.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Astrofísica de altas energías de alta energía.
- La física del púlsar es la física del púlsar.
Sus antecedentes:
- Los púlsares son estrellas de neutrones que giran rápidamente y emiten haces de radiación electromagnética.
- Comprender el mecanismo de la emisión pulsada es una cuestión fundamental en la investigación de púlsares.
- El espectro de alta energía de los púlsares contiene información crucial sobre los procesos de emisión.
Objetivo del estudio:
- Para investigar el mecanismo de emisión de alta energía de los púlsares.
- Para sondear la magnetosfera del púlsar mediante la medición del espectro de rayos gamma de alta energía.
- Para probar modelos teóricos de la emisión de pulsares.
Principales métodos:
- Utilizó el telescopio Cherenkov de imágenes de rayos gamma atmosférico mayor (MAGIC).
- Desarrolló un nuevo disparador electrónico para bajar el umbral de energía a 25 gigaelectronvoltios (GeV).
- Se detectaron pulsos de rayos gamma del púlsar del Cangrejo por encima de 25 GeV.
Principales resultados:
- Rayos gamma pulsados observados desde el púlsar Crab con energías superiores a 25 GeV.
- Reveló una energía de corte relativamente alta en el espectro promedio de fase del púlsar.
- La alta energía de corte observada proporciona restricciones en los modelos de emisiones.
Conclusiones:
- La región de emisión se encuentra muy lejos en la magnetosfera del púlsar.
- Se excluye el escenario de emisiones de las capas polares como explicación del espectro observado.
- La alta energía de corte desafía la validez del escenario de emisiones de la ranura.
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