Hubble looks into a cosmic kaleidoscope
|MACS J0416.1-2403 [Credit: NASA, ESA, CXC, NRAO/AUI/NSF, STScI, and |
G. Ogrean (Stanford University), Acknowledgment: NASA, ESA,
and J. Lotz (STScI), and the HFF team]
As with all galaxy clusters, MACS J0416 contains a significant amount of dark matter, which leaves a detectable imprint in visible light by distorting the images of background galaxies. In this image, this dark matter appears to align well with the blue-hued hot gas, suggesting that the two clusters have not yet collided; if the clusters had already smashed into one another, the dark matter and gas would have separated. MACS J0416 also contains other features—such as a compact core of hot gas—that would likely have been disrupted had a collision already occurred.
Together with five other galaxy clusters, MACS J0416 is playing a leading role in the Hubble Frontier Fields program, for which this data was obtained. Owing to its huge mass, the cluster is in fact bending the light of background objects, acting as a magnifying lens. Astronomers can use this phenomenon to find galaxies that existed only hundreds of million years after the big bang.
Source: NASA [March 26, 2016]