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Una poderosa fuente de radio irrumpiendo hacia el Centro Galáctico.

Scott D Hyman1, T Joseph W Lazio, Namir E Kassim

  • 1Department of Physics and Engineering, Sweet Briar College, Sweet Briar, Virginia 24595, USA. shyman@sbc.edu

Nature
|March 4, 2005
PubMed
Resumen

Los astrónomos han descubierto una nueva fuente de radio transitoria, GCRT J1745-3009, cerca del Centro Galáctico. Sus características únicas de estallido sugieren una clase previamente desconocida de transitorios cósmicos, ofreciendo información sobre eventos celestes dinámicos.

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Área de la Ciencia:

  • La radioastronomía es la radioastronomía.
  • La astrofísica es la astrofísica.
  • Los fenómenos astronómicos transitorios son fenómenos astronómicos que ocurren en el tiempo.

Sus antecedentes:

  • Las fuentes astronómicas transitorias a menudo significan eventos explosivos y suelen ser alimentadas por objetos compactos.
  • La radioastronomía ofrece observaciones de alta resolución temporal, pero está limitada por campos de visión estrechos, lo que lleva a una mala toma de muestras del cielo dinámico de radio.
  • Los instrumentos de amplio campo en las bandas de rayos X y rayos gamma detectan rutinariamente fuentes transitorias, a diferencia de las capacidades actuales de radioastronomía.

Objetivo del estudio:

  • Para reportar la detección de una nueva fuente de radio transitoria, GCRT J1745-3009.
  • Para caracterizar las propiedades de ráfaga de esta nueva fuente y compararlas con los transitorios de radio conocidos.
  • Explorar las implicaciones de su alta temperatura de brillo y densidad de energía para los mecanismos de emisión.

Principales métodos:

  • Utilizó un programa de monitoreo de campo moderadamente amplio de la región del Centro Galáctico.
  • Observaciones realizadas a una frecuencia de 0,33 GHz.
  • Analizó las características temporales y las propiedades espectrales de las ráfagas detectadas.

Principales resultados:

  • Se ha detectado una fuente de radio transitoria, GCRT J1745-3009, en la región del Centro Galáctico.
  • Características de ráfaga observadas que son distintas de todas las clases conocidas de transitorios de radio.
  • Se midió una temperatura de brillo de aproximadamente 10^16 K, lo que indica una densidad de energía extremadamente alta consistente con la emisión coherente.

Conclusiones:

  • GCRT J1745-3009 representa una clase previamente desconocida de fuente de radio transitoria.
  • Este descubrimiento pone de relieve el potencial de los nuevos radiotelescopios de amplio campo para descubrir nuevos fenómenos astronómicos.
  • Los hallazgos sugieren que el cielo de radio dinámico puede albergar muchas más clases transitorias no descubiertas.