The photo on the left shows the galaxy 2MASX J03193743 4137580.
On the right is the spiral galaxy UGC 2665: its characteristic structure is clearly visible in the image.
Both objects are located about 350 million lightyears from us. They are part of the Perseus Cluster - one of the most massive objects in the Universe, containing thousands of galaxies in a huge cloud of gas at a temperature of millions of degrees.
In 2003, astronomers discovered in the clusterwaves that are apparently created by the inflation of relativistic plasma bubbles in the active nucleus of the galaxy NGC 1275 in the center of the cluster. In the images taken with the Chandra X-ray Observatory, they are visible as ripples in the X-ray band, since the brightness of the X-rays is highly dependent on the plasma density.
Image taken with Wide Field Camera 3 (WFC3).
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