
No, no, no!
It's just god* turning the lights on and off !!!
* Insert deity of personal preference
NASA's Swift satellite appears to have confirmed one reason why a small percentage of supermassive black holes throw out vastly elevated levels of energy: it's provoked by violent collisions between galaxies. NASA explains that one per cent of such black holes - weighing in at "between a million and a billion times the Sun's …
I wonder how they decided whether these photons they're looking at were x-rays instead of gamma rays. As I recall, the difference between the two is how they're made: gamma rays for chemical radioactive sources, x-rays for electric sources. They didn't get to "Colliding Galaxies" as a source for either...
But then, they're calling them "hard" and "soft," so perhaps they don't really care what the proper name is...