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La imagen central de un cuásar con lente gravitacional
Joshua N Winn1, David Rusin, Christopher S Kochanek
1Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA. jwinn@cfa.harvard.edu
Nature
|February 13, 2004
Resumen
Los científicos han identificado a una persona desaparecida.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Cosmología Cosmología.
Sus antecedentes:
- Las galaxias pueden funcionar como lentes gravitacionales, creando múltiples imágenes de objetos celestes de fondo.
- La teoría predice un número impar de imágenes con lente, sin embargo, la mayoría de los casos observados muestran dos o cuatro imágenes.
- Las escurridizas imágenes 'central', que se predice que serán débiles y cerca del núcleo de la galaxia lente, son cruciales para el estudio de centros galácticos distantes.
Objetivo del estudio:
- Para identificar de manera segura una imagen gravitacional "central", no detectada previamente.
- Para utilizar la imagen central identificada para el análisis detallado de las propiedades del núcleo de la galaxia lente.
Principales métodos:
- Las observaciones de radio se llevaron a cabo en un sistema de lentes gravitacionales candidato.
- El modelado de la lente se realizó incorporando la imagen central recién identificada.
Principales resultados:
- Se identificó una imagen central definitiva a través de observaciones de radio.
- La masa del agujero negro supermasivo en el centro de la galaxia lente fue limitada a menos de 2 x 10 ^ 8 masas solares.
- Se determinó que la densidad de la superficie dentro de la galaxia lente era mayor que 20.000 masas solares por parsec cuadrado.
Conclusiones:
- La identificación segura de una imagen central proporciona una nueva herramienta para sondear núcleos galácticos.
- Los resultados se alinean con las expectativas teóricas y las observaciones de galaxias cercanas, validando los hallazgos.
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