There are competing theories as to what causes this powerful radiation & one intriguing possibility is an intermediate-mass black hole which is pulling in material from its surroundings .
关于是什么引起了这种强有力的辐射,还有其他的很多理论。有一种是说在这附近有一个巨大的黑洞,以至于吸引周围的很多物体。