NRAO / AUI / NSF / SCIENCE PHOTO LIBRARY NRAO / AUI / NSF / SCIENCE PHOTO LIBRARY
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False colour radio image of the spiral galaxy NGC 4631 at a wavelength of 20 cm taken with the Very Large Array (VLA) radio telescope, New Mexico. NGC 4631 is a spiral galaxy seen almost exactly edge- on. The brightest emission (red to light blue) comes from highly energetic charged particles, called cosmic rays, within the galaxy. The purple region corresponds to emission from areas far above and below the plane of the galaxy showing that NGC 4631 has a radio halo caused by cosmic rays leaking out of the disc of the galaxy. This image shows a field of view 18x18 arcmin at a resolution of 30 arcsec. Observers; R. Ekers, R. Sancisi & M. Shapiro. C-configuration, 27 antennae. This picture may not be used to state or imply the endorsement by NRAO, AUI or NSF of any company or product.
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