The ROSAT Deep Survey IV. A distant lensing cluster of galaxies with a bright arc

G. Hasinger, R. Giacconi, J. E. Gunn +7

An unusual double-lobed extended X-ray source (RX J105343+5735) is detected in the ROSAT ultra-deep HRI image of the Lockman Hole. The angular size of the source is 1.7 X 0.7 arcmi…