A trail found in the gas surrounding a distant galaxy could be the smoking gun pointing to a runaway supermassive black hole.
But those supermassive black holes all had one thing in common: they're active, which means they're surrounded by a cloud of material that's falling into their gaping mouths of doom. This process generates insane amounts of heat and light, which makes them much easier to spot.
The discovery was made in the course of other investigations. The researchers were using Hubble to study a much closer dwarf galaxy called RCP 28. It was in that image that they discovered something that might just be the trail of a runaway supermassive black hole. Looking more closely, they found that the streak was not uniform in color or brightness. It also shows signs of strong ionization, and shock regions. Some of the ionization could be explained by the presence of very young, hot, massive stars; that's consistent with astrophysical shocks, which tend to compress gas and cause clumps of it to collapse under gravity, forming baby stars.
In fact, the observed streak happens to be the very opposite of what astronomers would expect of a jet of gas; strongest at the farthest point from the galaxy, where there is less material, and narrower at greater distance, rather than spreading out like a jet.
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