THE 2ND EXTREME-ULTRAVIOLET EXPLORER SOURCE CATALOG

We present the second catalog of extreme-ultraviolet objects detected by the Extreme-Ultraviolet Explorer. The data include(1) all-sky surve y detections from the initial 6 month scanner-survey phase, (2)additio nal scanner detections made subsequently during specially programmed o bservations designed to fill in low-exposure sky areas of the initial survey, (3) sources detected with deep-survey-telescope observations a long the ecliptic, (4) objects detected by the scanner telescopes duri ng targeted spectroscopy observations, and (5) other observations. We adopt an innovative source detection method that separates the usual l ikelihood function into two parts: an intensity diagnostic and a profi le diagnostic. These diagnostics allow each candidate detection to be tested separately for both signal-to-noise ratio and conformance with the known instrumental point-spread function. We discuss the dependenc e of the false-alarm rate and the survey's completeness on the survey' s sensitivity threshold. We provide three lists of the EUV sources det ected: the all-sky survey detections, the deep-survey detections, and sources detected during other phases of the mission. Each list gives p ositions and intensities in each wave band. The total number of object s listed is 734. For approximately 65% of these we also provide plausi ble optical, UV, radio, and/or X-ray identifications.