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Una fuente de radio transitoria cerca del centro de la galaxia de la Vía Láctea
Science (New York, N.Y.)
|March 20, 1992
Resumen
Una nueva fuente de radio del centro galáctico transitorio (GCT) apareció en 1990, alcanzando un pico de intensidad después de un mes. Este transitorio probablemente fue el resultado de la emisión de sincrotrones de un sistema binario de rayos X.
Área de la Ciencia:
- La radioastronomía es la radioastronomía.
- Los estudios del centro galáctico estudian el centro galáctico.
- Los fenómenos astronómicos transitorios son fenómenos astronómicos que ocurren en el tiempo.
Sus antecedentes:
- Una nueva fuente de radio, el centro galáctico transitorio (GCT), surgió cerca del centro de nuestra galaxia a finales de 1990.
- La intensidad del GCT rivalizó con la de Sagitario A * (Sgr A *), la fuente de radio compacta establecida en el núcleo galáctico.
Objetivo del estudio:
- Para analizar las características y el origen del recién descubierto centro galáctico transitorio (GCT).
- Determinar la ubicación y la naturaleza del GCT utilizando observaciones de absorción de radio e infrarrojos.
Principales métodos:
- Monitoreo de la densidad de flujo y el espectro de radio del GCT a lo largo del tiempo.
- Utilizando hidrógeno neutro (HI) y hidróxilo (OH) espectroscopia de línea de absorción.
- Comparando las características de absorción del GCT con fuentes conocidas del centro galáctico.
- Analizando imágenes infrarrojas de la región.
Principales resultados:
- El GCT exhibió un rápido aumento de la densidad de flujo, alcanzando su punto máximo en un mes, seguido de una disminución gradual durante tres meses.
- Se observó consistentemente un espectro de radio empinado durante las fases de ascenso y decaimiento del GCT.
- La absorción de HI indicó la proximidad del GCT al centro galáctico, similar a Sgr A*.
- Las observaciones de HI y OH revelaron una absorción consistente con una nube molecular a +20 km/s, lo que sugiere que el GCT está incrustado en o detrás de esta nube.
- Las observaciones infrarrojas confirmaron la presencia de esta nube molecular, pero su opacidad era insuficiente para ocultar una supernova cercana.
Conclusiones:
- El GCT se encuentra cerca o dentro de una nube molecular que se mueve a +20 km/s en relación con el estándar local de reposo.
- Las propiedades observadas del GCT son inconsistentes con una supernova.
- La explicación más probable para el GCT es la emisión de radio transitoria originada por la radiación de sincrotrón dentro de un sistema binario de rayos X.
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