"If two galaxies collide and each possesses a supermassive black hole, there should be times when both black holes switch on as AGN," said coauthor Richard Mushotzky, professor of astronomy at UMCP.

“如果两个星系碰撞和每个人都拥有一个超大质量的黑洞，应当有两个黑洞的时候，作为活动星系核转，说：”作者之一理查德mushotzky，天文学教授UMCP。