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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...
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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
15:06

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Published on: January 3, 2016

Las llamaradas de rayos X de pulsares de milisegundos después de la fusión.

Z G Dai1, X Y Wang, X F Wu

  • 1Department of Astronomy, Nanjing University, Nanjing 210093, China. dzg@nju.edu.cn

Science (New York, N.Y.)
|February 25, 2006
PubMed
Resumen

Las ráfagas de rayos gamma de corta duración pueden tener su origen en la fusión de estrellas de neutrones. Los púlsares recién formados pueden generar llamaradas de rayos X de larga duración a través de las interacciones del campo magnético después del evento de fusión.

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Área de la Ciencia:

  • La astrofísica es la astrofísica.
  • Astrofísica de altas energías de alta energía.
  • Fusiones de objetos compactos Fusiones de objetos compactos

Sus antecedentes:

  • Observaciones recientes sugieren que las explosiones de rayos gamma (GRB) de corta duración son el resultado de fusiones compactas de estrellas.
  • Las llamaradas de rayos X observadas en GRB cortos persisten más tiempo de lo previsto por los modelos previos posteriores a la fusión.

Objetivo del estudio:

  • Para investigar el origen de las llamaradas de rayos X extendidas después de breves ráfagas de rayos gamma.
  • Proponer un mecanismo que involucre fenómenos posteriores a la fusión en fusiones de estrellas de neutrones binarias.

Principales métodos:

  • Utilizando el modelado teórico de pulsares de milisegundos de rotación diferencial formados después de fusiones de estrellas de neutrones binarias.
  • Analizando la evolución de los campos magnéticos, incluyendo el campo poloidal y la generación de campos toroidales.
  • Investigando el proceso de reconexión magnética y sucesos explosivos posteriores.

Principales resultados:

  • La rotación diferencial en los púlsares recién formados puede amplificar significativamente los campos magnéticos internos.
  • Los fuertes campos magnéticos toroidales generados pueden emerger de la superficie estelar.
  • La reconexión magnética de estos campos emergentes puede conducir a eventos explosivos, produciendo llamaradas de rayos X.

Conclusiones:

  • Los púlsares de milisegundos que giran diferencialmente proporcionan una explicación viable para las llamaradas de rayos X de larga duración observadas después de GRB cortos.
  • El mecanismo propuesto concilia las duraciones de las llamaradas observadas con las escalas de tiempo teóricas posteriores a la fusión.
  • Este estudio ofrece una nueva perspectiva sobre los procesos energéticos que siguen a las fusiones de estrellas de neutrones.