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Bariones en el borde del cúmulo de galaxias más brillante en rayos X
Aurora Simionescu1, Steven W Allen, Adam Mantz
1Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305, USA. asimi@stanford.edu
Science (New York, N.Y.)
|March 26, 2011
Resumen
Las afueras de los cúmulos de galaxias revelan la distribución del gas. Las mediciones muestran que la fracción bariónica es consistente con los valores universales, lo que desafía los hallazgos anteriores y sugiere un gas agrupado en el crecimiento de la red cósmica.
Área de la Ciencia:
- Cosmología Cosmología.
- La astrofísica del plasma es la astrofísica del plasma.
- Investigación de los cúmulos de galaxias.
Sus antecedentes:
- El gas emisor de rayos X difuso en los cúmulos de galaxias ofrece información sobre la cosmología y la física del plasma.
- Los avances recientes permiten mediciones de señales débiles en las afueras de los cúmulos.
Objetivo del estudio:
- Para llevar a cabo un censo preciso y de resolución espacial de gas, metales y materia oscura en las afueras del cúmulo de Perseo.
- Para investigar la fracción bariónica en el borde de los cúmulos de galaxias.
Principales métodos:
- Utilizó datos del telescopio de rayos X Suzaku.
- Se realizó un análisis de resolución espacial de la emisión difusa de rayos X del cúmulo de Perseo.
Principales resultados:
- Las mediciones de la fracción bariónica en las afueras del cúmulo de Perseo son consistentes con el valor universal a la mitad del radio virial.
- La fracción bariónica excede la media cósmica en radios más grandes, al contrario de estudios anteriores.
- La evidencia sugiere una distribución agrupada de gas en las regiones externas del cúmulo.
Conclusiones:
- La distribución del gas en las afueras de los cúmulos de galaxias es compleja y puede desviarse de modelos simples.
- El gas agrupado en las afueras de los cúmulos es crucial para comprender la formación de estructuras jerárquicas y el crecimiento de la red cósmica.
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