Rayos-X, material oscura y galaxias en el cúmulo Abell 2744
Esta imagen del cúmulo Abell 2744 combina exposiciones tomadas en luz visible por el Telescopio Espacial Hubble NASA/ESA y el Very Large Telescope de ESO en Cerro Paranal (Chile), con datos obtenidos en rayos-X con el Observatorio espacial Chandra de la NASA y reconstrucciones matemáticas de la ubicación de la materia oscura.
Las galaxias en el cúmulo, si bien corresponden a la única parte visible en el rango óptico del espectro, contribuyen sólo con el 5% de la materia del cúmulo.
El gas caliente dentro del cúmulo (representado con el color rosado y que equivale a cerca del 20% de la masa del cúmulo) es visible a través de sus emisiones en rayos-X, observadas con el satélite Chandra de la NASA.
La capa azul corresponde a un mapa de la masa dentro del cúmulo. Esto fue reconstruido sobre la base de un detallado análisis de la forma en que el cúmulo curva la luz de las galaxias en el fondo distante. Evidencias de esta curvatura de la luz puede ser apreciada en las distorsiones con forma de arco, visibles en algunas partes de esta imagen. Como la materia oscura representa la mayor parte de la masa en el cúmulo – cerca de un 75% – esta capa azul superpuesta revela la ubicación de la, de lo contrario invisible, materia oscura.
El análisis de estos datos ha permitido a los científicos observar algunos extraños fenómenos en Abell 2744, incluyendo una bolsa de materia oscura sin gas ni galaxias, y una agrupación de galaxias sin gas asociado. Los astrónomos creen que Abell 2744 se formó a partir de la colisión simultánea de al menos cuatro cúmulos individuales.
Crédito:NASA, ESA, ESO, CXC & D. Coe (STScI)/J. Merten (Heidelberg/Bologna)
Sobre la imagen
| Identificador: | eso1120a |
| Idioma: | es |
| Tipo: | Observación |
| Fecha de publicación: | 22 de Junio de 2011 a las 15:00 |
| Noticias relacionadas: | eso1120 |
| Tamaño: | 8068 x 8067 px |
Sobre el objeto
| Nombre: | Abell 2744 |
| Tipo: | Early Universe : Galaxy : Grouping : Cluster |
| Distancia: | z=0.308 (desplazamiento al rojo) |
| Constellation: | Sculptor |
Formatos de imagen
Fondo de pantalla
Coordenadas
| Position (RA): | 0 14 20.41 |
| Position (Dec): | -30° 23' 56.72" |
| Field of view: | 6.70 x 6.70 arcminutes |
| Orientación: | El norte está a 0.1° a la derecha de la vertical |
Colores y filtros
| Banda | Longitud de onda | Telescopio |
|---|---|---|
| Óptico V | Very Large Telescope FORS1 | |
| Óptico B | 435 nm | Hubble Space Telescope ACS |
| Óptico R | Very Large Telescope FORS1 | |
| Óptico V | 606 nm | Hubble Space Telescope ACS |
| Infrarrojo I | Very Large Telescope FORS1 | |
| Óptico I | 814 nm | Hubble Space Telescope ACS |
| Rayos X | Chandra X-ray Observatory |
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