Abstract. We present the Hamburg/RASS Catalogue of optical identifications (HRC). The catalogue contains optical information about objects inside the error circles of ROSAT All-Sky Survey (RASS) sources. The information was gathered from objective prism and direct plates taken by the Hamburg Quasar Survey (HQS). The plates enable an effective selection of several X-ray emitting classes of objects, as there are galaxies, AGN, QSOs, galaxy clusters and several types of galactic stars, in particular M dwarfs, hot white dwarfs and cataclysmic variables. In the current state (November 1996) the HRC contains information about 3847 X-ray positions and covers about 8480 deg 2 of the high galactic latitude (|b| > 20• ) northern sky. For 81.2% of the X-ray sources a plausible optical counterpart is given. The counterparts of the remaining sources are probably faint (B > 18.5) AGN and galaxy clusters. The HRC is available electronically together with finding charts taken from the digitized direct HQS plates.
Abstract. The Hamburg Quasar Survey is a wide-angle objective prism survey for finding bright QSOs in the northern extragalactic sky (|b| > 20• ; δ > 0 • ). The taking of the prism plates for 567 fields covering this area was completed in 1997. Including direct plates for fields with δ > 20• the plate archive contains now 1871 plates. In this paper we present a first list of 121 quasars 1 , which were verified by slit spectroscopy in the years 1986-1991, while experiments to develop efficient selection techniques were made. The sample contains objects with brightnesses 15 ≤ B ≤ 19.5 and redshifts z ≤ 2.8 collected over various parts of the sky, for which objective prism plates were available at that time.
The tenth part of the catalogue of Sliakltbazian groups contains the positions and references of all t.he galaxies of t . 1~following 35 groups (north of 6 > $2'30'):
The eighth part of the catalogue of Shakhbazian groups contains the positions and references of all the galaxies of the following 48 groups (north of 6 >
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