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The 20 hard X-ray sources used in the present study were found in a 100 Ks exposure of the Hawaii deep survey field SSA13 with the ACIS-S instrument on Chandra and were first described in Mushotzky, Cowie, Barger & Arnaud (2000, Nature 404, 459). For the present work the sample was further restricted to the sources lying closer than 4.5 arcminutes from the center of the Chandra image (the large circle) where the sharpness of the Chandra images is best and where the optical counterparts are most reliably identified. The sources are shown here with the small circles on a 2-6 Kev image of the field.
Move the mouse over each image to see a picture of the optical source corresponding to the X-ray source and to find the redshift of the object. The thumbnail shown is a three-color near-infrared and optical image of the source. More details on the properties of the sources may be found in Barger, Cowie, Mushotzky & Richards (2001, Astronomical Journal in press).
A larger version of this image can be found here.