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0957 + 561 A, B: objetos gemelos casi estelares o lentes gravitacionales?
Nature
|May 31, 1979
Resumen
Dos cuásares (QSOs), 0957 + 561 A y B, con desplazamiento al rojo 1.405 muestran similitudes espectrales que sugieren una asociación. Su proximidad cercana y los datos espectrales plantean preguntas sobre si son objetos distintos o un quásar único con lente gravitacional.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Cosmología Cosmología.
- Lente gravitacional es el fenómeno de las lentes gravitacionales.
Sus antecedentes:
- Los cuásares (QSOs) son núcleos galácticos activos muy luminosos.
- La lente gravitacional es la curvatura de la luz de una fuente distante por la gravedad de un objeto entre la fuente y el observador.
- El par de cuásares 0957 + 561 A y B se observan con una separación de 5,7 segundos de arco.
Objetivo del estudio:
- Para investigar la naturaleza del par de cuásares 0957 + 561 A y B.
- Para determinar si los dos objetos son cuásares distintos o imágenes gravitacionales de un solo objeto.
- Para analizar los datos espectrales en busca de evidencia de asociación.
Principales métodos:
- Análisis espectroscópico de los cuásares 0957 + 561 A y B.
- Mediciones fotométricas para determinar la magnitud aparente.
- Análisis de la separación espacial y el corrimiento al rojo.
Principales resultados:
- Los espectros de 0957 + 561 A y B indican que están asociados.
- Se determinó un desplazamiento al rojo de 1.405 para ambos objetos.
- La estrecha separación angular (5,7 segundos de arco) y la similitud espectral presentan desafíos para clasificarlos como dos objetos separados.
Conclusiones:
- La evidencia espectral sugiere fuertemente que 0957 + 561 A y B están asociados.
- La posibilidad de que 0957 + 561 A y B sean dos imágenes del mismo cuásar, formadas por lente gravitacional, es una consideración importante.
- Se necesitan más investigaciones para distinguir definitivamente entre dos cuásares separados y un sistema con lente gravitacional.
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