Deep Field: optical image with x-ray sources superimposed			13/01/2000
			This is an optical image with X-ray data superimposed.
			Go to full text
Image Credit: NASA, Goddard Space Flight Center, (Mushotzky et al.)
Now you don't see it; now you do. The invisible swath of X-ray radiation that baths the Universe arises in large part from X-ray-bright, optically faint galaxies at extremely far distances. The "big three" -- Hubble Space Telescope, Keck Observatory and The University of Hawaii 2.2 meter telescope -- detect no or little evidence of any light source. The Chandra X-ray Observatory however, peering in the same deep field, spots the culprits. The observation suggests that the Hubble Deep Field may have missed a large population of Active Galaxies.
			Return to top of page