A radio and optical view of galaxy NGC 5643 shows the fiery core of a luminous Seyfert galaxy, powered by gas and debris being sucked into a supermassive black hole hidden by vast clouds of dust and debris. It is difficult to probe the shrouded inner regions of a Seyfert galaxy, but researchers using the Atacama Large Millimetre/submillimetre Array – ALMA – and the Multi Unit Spectroscopic Explorer – MUSE – on the Very Large Telescope have captured this view of electrically charged gas being ejected from the black hole’s accretion disk to either side of the core. Cold molecular gas traced by carbon monoxide, seen in red, defines the galaxy’s rotating inner region.
Subtle distortions hidden in a stunning Atacama Large Millimetre/submillimetre Array (ALMA) image of the gravitational lens SDP.81 are telltale signs that a dwarf dark galaxy is lurking in the halo of a much larger galaxy nearly 4 billion light-years away. This discovery could help astronomers address important questions on the nature of dark matter.