GALLERY: Black holes galore

AN ASSORTMENT OF BLACK HOLES lights up a new image from NASA’s Nuclear Spectroscopic Telescope Array, or NuSTAR. Although the coloured blobs might not look like much, every one of them is a black hole located inside the hearts of a galaxy.

The different colours represent different energies of X-ray light. The red, yellow and green colours represent black holes seen previously by NASA’s Chandra X-ray Observatory (with red denoting the lowest-energy X-ray light). The colour blue shows black holes recently detected by NuSTAR, which is uniquely designed to detect the highest-energy X-ray light.

Image showing X-ray emission from black holes

Every one of the blobs you can see here, represents the location of a black hole. Although black holes cannot be directly seen, the X-ray light given off by hot gas in the vicinity can – and that’s what we see here; X-ray emission detected by the Chandra and NuSTAR space observatories.

The black holes in this picture are between about 3 to 10 billion light-years away.

The X-rays aren’t coming from the black holes themselves, since nothing can escape the gravitational grip of a black hole. Rather, they are coming from hot gas in the vicinity of the black holes.

Why do some black holes produce more high-energy X-ray light than others? Astronomers say this is because the black holes are more actively feeding off surrounding clouds of dust and gas – a process which heats up the gas and makes it emit X-rays.

The image shows an area, called the COSMOS field, that has been studied in great detail by many telescopes (COSMOS stands for Cosmic Evolution Survey). Red and green represent X-ray light seen by Chandra. Blue is for the kind of X-ray light that can only be seen by NuSTAR.

Adapted from information issued by NASA / JPL-Caltech / Yale University.

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