An image from the VeryLargeTelescope shows a merged galaxy with the closest known pair of supermassive black holes.
At the heart of almost every galaxy lies an enormous black hole. These monsters are so massive that they get a classification of their own: supermassive black holes, with masses millions or even billions of times the mass of our sun. And when two galaxies collide, their supermassive black holes get closer and closer until these beasts eventually merge as well.
This almost incomprehensible process is on display in an image recently shared by the European Southern Observatory , showing an almost-merged galaxy that contains the closest pair of supermassive black holes ever discovered at just 1,600 light years apart.
The image was taken using the Very Large Telescope, a ground-based telescope located in the Atacama Desert in Chile that is made up of four individual telescopes, each of which has a primary mirror 8.2 meters across. On one of these telescopes, named VLT UT1, is an instrument called the FOcal Reducer and low dispersion Spectrograph 2 or FORS2, which is capable of taking spectrometry data from multiple targets at the same time as well as measuring the polarization of light.
FORS2 captured the galaxy in which the two black holes are approaching each other in this image, showing how areas of stars, dust, and gas around the edges of the galaxy are stretched out into space, creating tails that reach out from the galaxy’s main body. This image also provides a creepy preview of what could eventually happen to our home galaxy, the Milky Way, when it merges with the nearby Andromeda Galaxy in billions of years. As ESO writes, “Our home galaxy, which also sports a supermassive black hole at its center, is on a path to merge with our closest large neighbor, the Andromeda Galaxy, billions of years from now.
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