3 April 2015
The wispy inexperienced clouds seen in these galaxies are uncommon as a result of they’re so brilliant. They’re emission nebula stimulated into glowing as a result of a burst of ultraviolet mild. That by itself isn’t uncommon, however the central quasars aren’t significantly brilliant. The brightness of those surrounding clouds signifies that the quasars had been fairly brilliant up to now.
Given the size of those clouds and their present brightness, the sunshine stimulating the emission originated from the quasar tens of hundreds of years in the past. That may seem to be a very long time for a quasar to go quiet, however on a cosmic scale that’s fairly quick, and quasars don’t usually differ a lot in brightness. So what’s happening?
One concept is that the quasars are powered not by one supermassive black gap, however two. Two carefully orbiting black holes might disrupt the movement of matter into one another, and this is able to trigger the brightness of the quasar to differ. This could appear to be supported by the form of the clouds themselves, which are inclined to have a twisted, spiral form indicative of merged galaxies.