Figure 4.
The long ROSAT HRI
observation of the field of 3EG J1835+5918 from 1997 December/1998 January. The X-ray image is overlaid with source location contours (68 and 95 per cent) of the high-energy gamma-ray source, determined above 1 GeV. The detected X-ray sources are indicated and were subject of a optical follow-on identification campaign. Q13