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Turbulencia y campos magnéticos en la estructura a gran escala del universo
Dongsu Ryu1, Hyesung Kang, Jungyeon Cho
1Department of Astronomy and Space Science, Chungnam National University, Daejeon 305-764, Korea. ryu@canopus.cnu.ac.kr
Science (New York, N.Y.)
|May 20, 2008
Resumen
Los choques cosmológicos generan turbulencias que amplifican los campos magnéticos en el espacio intergaláctico. Las simulaciones revelan diferentes niveles de turbulencia, lo que lleva a la estimación de las intensidades del campo magnético en las estructuras cósmicas.
Área de la Ciencia:
- Cosmología y astrofísica, centrándose en la física del medio intergaláctico.
- Física del plasma y magnetohidrodinámica en las estructuras cósmicas a gran escala.
Sus antecedentes:
- El origen y la naturaleza de la turbulencia y los campos magnéticos en el espacio intergaláctico siguen siendo poco conocidos.
- La formación de estructuras cosmológicas implica choques que pueden generar vorticidad.
Objetivo del estudio:
- Proponer un mecanismo físico para inducir turbulencias y amplificar los campos magnéticos en el medio intergaláctico.
- Para investigar el papel de la cascada de vorticidad de los choques cosmológicos en la generación de turbulencias.
- Para estimar las intensidades de campo magnético resultantes en diferentes estructuras a gran escala.
Principales métodos:
- Modelado teórico de la cascada de vorticidad de los choques cosmológicos.
- Simulaciones de supercomputadora para estudiar las propiedades de la turbulencia (subsónica, transónica, supersónica) en cúmulos de galaxias, grupos y filamentos.
- Aplicación de un modelo de dinamo de turbulencia para estimar las intensidades de los campos magnéticos.
Principales resultados:
- Los movimientos de flujo turbulento son inducidos por la cascada de vorticidad en los choques cosmológicos.
- Las simulaciones muestran turbulencias subsónicas dentro de cúmulos o grupos de galaxias y turbulencias transónicas o ligeramente supersónicas en filamentos.
- Las intensidades medias estimadas de los campos magnéticos son unos pocos microgauss (μG) en racimos/grupos, ~0.1 μG alrededor de ellos, y ~10 nanogauss (nG) en filamentos.
Conclusiones:
- El modelo propuesto proporciona un mecanismo físico para transferir la energía gravitacional en turbulencia y energía de campo magnético dentro de la estructura a gran escala.
- Este mecanismo explica la amplificación de los débiles campos magnéticos semilla en el espacio intergaláctico.
- El estudio ofrece estimaciones cuantitativas de las intensidades de los campos magnéticos en diferentes entornos cósmicos.
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