Hubble Finds Jets and Explosions in NGC 7793. Image credit: /Hubble & NASA
 
 
This new image from the NASA/ESA Hubble Space Telescope shows NGC 7793, a spiral galaxy in the constellation of Sculptor some 13 million light-years away from Earth. NGC 7793 is one of the brightest galaxies in the Sculptor , one of the closest groups of galaxies to the Local — the of galaxies containing our galaxy, the Milky Way and the Magellanic Clouds.

The image shows NGC 7793’s spiral arms and small bulge.
Unlike some other spirals, NGC 7793 doesn’t have a very pronounced spiral structure, and its is further muddled by the mottled pattern of dark dust that stretches across the frame. The occasional burst of bright pink can be seen in the galaxy, highlighting stellar nurseries containing newly- baby stars.
Although it may look serene and beautiful from our perspective, this galaxy is actually a very dramatic and violent place. Astronomers have discovered a powerful micro-quasar within NGC 7793 — a system containing a hole actively feeding on from a companion star. A micro-quasar is an object that has some of the properties of quasars in miniature. While many full-sized quasars are known at the cores of other galaxies, it is unusual to find a quasar in a galaxy’s disk rather than at its center.
Micro-quasars are almost like scale models — they allow astronomers to study quasars in detail. As material inwards towards this black hole, it creates a swirling disk around it. Some of the infalling gas is propelled violently outwards at extremely speeds, creating jets streaking out into space in opposite directions. In the case of NGC 7793, these jets are powerful, and are in the process of creating an expanding bubble of gas some 1,000 light-years across.