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Giant radio jets from the wrong kind of galaxy


Despite its unassuming appearance, the edge-on spiral galaxy captured in the left half of this NASA/ESA Hubble Space Telescope image is actually quite remarkable.
Located about one billion light-years away in the constellation of Eridanus, this striking galaxy — known as LO95 0313-192 — has a spiral shape similar to that of the Milky Way. It has a large central bulge, and arms speckled with brightly glowing gas mottled by thick lanes of dark dust. Its companion, sitting pretty in the right of the frame, is known rather unpoetically as [LOY2001] J031549.8-190623.

Credi: ESA/Hubble & NASA. Acknowledgement: Judy Schmidt.

LO95 0313-192 is the large, edge-on spiral galaxy left of centre in this image. It lies about one billion light-years away in the constellation of Eridanus. 

Jets, outbursts of superheated gas moving at close to the speed of light, have long been associated with the cores of giant elliptical galaxies, and galaxies in the process of merging. However, in an unexpected discovery, astronomers found LO95 0313-192 to have intense radio jets spewing out from its centre! The galaxy appears to have two more regions that are also strongly emitting in the radio part of the spectrum, making it even rarer still.

Credit: NASA/ESA, NRAO/AUI/NSF and W. Keel (University of Alabama, Tuscaloosa).

This is a composite image of galaxy LO95 0313-192, the first spiral galaxy known to be producing a giant radio-emitting jet. This close-up of the Hubble telescope image has a red overlay from a higher-resolution Very Large Array picture showing the inner portion of the jet. 

The discovery of these giant jets in 2003 — not visible in the image above, but indicated in this earlier Hubble composite below — has been followed by the unearthing of a further three spiral galaxies containing radio-emitting jets in recent years. This growing class of unusual spirals continues to raise significant questions about how jets are produced within galaxies, and how they are thrown out into the cosmos.

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