El telescopio espacial de rayos gamma Fermi, de la NASA, ha revelado una extraña estructura que nunca antes se había observado en nuestra galaxia. Se trata de dos burbujas cargadas de energía que erupcionan en el centro de la Vía Láctea y que contienen energía equivalente a 100.000 explosiones de supernovas, según publican en “The Astrophysical Journal”.
"Lo que vemos son dos burbujas que emiten rayos gamma y que se extienden a lo largo de 25.000 años luz cada una, de norte y sur, en el centro galáctico", dice el astrónomo Doug Finkbeiner, del centro Smithsonian (Universidad de Harvard). Finkbeiner reconoce que aún no se entiende bien el origen y la naturaleza de este fenómeno de tan grandes dimensiones.
La estructura atraviesa más de la mitad del cielo visible, desde la constelación de Virgo a la de Grus y puede tener millones de años.
Finkbeiner y su equipo descubrieron las burbujas cuando procesaban los datos enviados por el detector LAT del telescopio, que es el más sensible a los rayos gamma que se ha lanzado hasta ahora. Los rayos gamma son una radiación electromagnética de altísima energía, pero hasta ahora otros astrónomos no habían observado ambas concentraciones debido a la niebla que genera esta radiación en la galaxia y que le da su aspecto lechoso.
Niebla en la Vía Láctea
Realizando varias estimaciones de esta niebla, Finkbeiner y sus colegas lograron aislar los datos y revelar las burbujas gigantescas. Los científicos tratan ahora de entender cómo se formaron sus estructuras, que parecen tener bordes muy definidos.
Por su forma, podrían ser el resultado de un lanzamiento grande y rápido de energía de una fuente que aún es un misterio.
Una posibilidad podría ser una inyección desde un agujero negro supermasivo en el centro de la galaxia.
imagen real
Dos burbujas de energía captadas por el telescopio Fermi en la Vía Láctea. | Nasa - Nasa Agencia
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