RSSAll Entries Tagged With: "NuSTAR"

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.

Get daily updates by RSS or email! Click the RSS Feed link at the top right-hand corner of this page, and then save the RSS Feed page to your bookmarks. Or, enter your email address (privacy assured) and we’ll send you daily updates. Or follow us on Twitter, @spaceinfo_oz

Like this story? Please share or recommend it…