Cos-B gamma-ray sources beyond the predicted diffuse emission

The ``2CG'' gamma-ray point-source catalog was established before galactic surveys of the CO-line emission tracing molecular hydrogen became available. With the complete galactic HI and CO surveys which are now available, it has become possible to remove the effect of ``galactic diffuse'' emission from point source catalogs discriminating those sources which are either compact objects or very local and strong enhancements in the galactic cosmic-ray distribution from those which are artifacts due to the structured gas distribution. A new methodology has been developed for this purpose with the following three features: automatic generation of source catalogs using correlation analysis, simulation of trials to derive catalog significance thresholds, and bootstrap sampling to derive confidence intervals for source parameters. The analysis reported here shows that about half of the 2CG sources are explained by concentrations in the distribution of molecular hydrogen, and it reports the discovery of several new rather weak sources.