Andromeda in UV


AndromedaGalex_900Andromeda Galaxy (aka M31) is just next door as large galaxies go, only about 2.5 million light-years. So close and spanning some 260,000 light-years, it took 11 images from the Galaxy Evolution Explorer (GALEX) satellite’s telescope to produce this portrait of the spiral galaxy in ultraviolet light. While its spiral arms stand out in visible light images, they look like rings in UV because the image is dominated by light from hot, young, massive stars. As sites of intense star formation, the rings have been interpreted as evidence Andromeda collided with its smaller neighboring elliptical galaxy M32 more than 200 million years ago.

Image Credit: NASA

A UV View of Andromeda


This mosaic of M31 merges 330 individual images taken by the Ultraviolet/Optical Telescope aboard the Swift spacecraft. It is the highest-resolution image of the galaxy ever recorded in the ultraviolet. Also known as the Andromeda Galaxy, M31 is more than 220,000 light-years across and lies 2.5 million light-years away. On a clear, dark night, the galaxy is faintly visible as a misty patch to the naked eye.

The irregular shape of the image results when the more than 300 images were assembled to make the final image.

There are three instruments on Swift—a UV telescope, an X-ray telescope, and the Burst Alert Telescope which serves as the gamma ray burst detector for the spacecraft. I contributed to the design of the ultra-quiet regulators powering the detector blocks in the BAT.

Image Credit: NASA /Swift / Stefan Immler (GSFC) and Erin Grand (UMCP)