Radio-loud ROSAT sources near the North Ecliptic Pole

A deep and large-area survey of the North Ecliptic Pole region was made wit h the ROSAT All-Sky Survey and the VLA to elucidate the population of radio -loud extragalactic objects. A region of 29.3 square degrees was surveyed W ith sensitivities around 5 10(-14) erg s(-1) cm(-2) in the soft X-ray band and 1 mJy at 1.5 GHz. Optical counterparts were sought on digitized Schmidt plates from POSS-I and II. Seventy-four reliable RASS-VLA sources were fou nd. The sample is a heterogeneous mixture of Seyfert galaxies, quasars, BL Lac objects, galaxy clusters and groups containing a radio galaxy. Optical magnitudes range from B similar or equal to 14 to B > 22. Three results are noteworthy: (1) the bimodality in the ratio of radio to optical emission s een in optically- and X-ray-selected AGN samples is also evident in the ROS AT-VLA objects; (2) X-ray and radio selection is an effective method for lo cating poor galaxy clusters and groups; and (3) a considerable population o f optically faint but X-ray/radio-bright objects is present. This last grou p may be either distant clusters with radio galaxies or "red quasars".