When galaxies merge, their resident black holes are sent into forced marriages, orbiting eachother. But without gravitational interactions with stars or interstellar gas, supermassive blackholes can’t get close enough to each other to go into a rapid death spiral, a situation known asthe “final parsec problem. (A parsec is the astronomical standard of distance, 3.26 light-years.)
当星系合并的时候,各自的黑洞被迫拴在一起,相互环绕运动。不过,如果没有与星体或星际气体之间的相互牵引,超大质量黑洞不能靠近到能迅速走向碰撞的地步,而这种现象被称为“最后的秒差距问题(秒差距是天文学距离单位,1秒差距等于3.26光年)。
So, as Dr. Phinney explained, unless hundreds of millions of solar masses of gas accompanythe black holes, “there are not very convincing ways of getting them to smaller separationslike the black holes in PG 1302-102.
因此,正如菲尼解释的那样,除非双黑洞周围有数亿太阳质量的气体,“没有令人信服的办法来让它们的距离缩小到PG 1302-102的两个黑洞那么近的地步。
At least that is the theory. If such systems are common, Dr. Phinney said, the gravitationalwaves emanating from them should sweep the universe and disrupt the timing of signals frompulsars, an effect that could be detected within the next few years by various ongoingprograms to time pulsars.
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