Andromeda's Revenge

Philip Evans - Department of Physics and Astronomy

philip evans

The famous Andromeda galaxy is the most distant object normally visible to the naked eye. But the naked eye can’t tell you that it is awash with X-rays. This image is a composite of 570 observations with the X-ray telescope on board the Swift satellite, which I processed for a forthcoming X-ray catalogue. The X-ray camera was built here at the University of Leicester. The red cloud near the centre is gas at 3 million degrees C, while the stars' colours show how energetic they are, the bluer the 'harder' the X-rays. Better stay away Cetus, you might get burned!