The Hamburg/RASS Catalogue of optical identifications

Astronomy & Astrophysics Supplement 127, 145 (1998)

N. Bade [1], D. Engels [1], W. Voges [2], V. Beckmann [1], Th. Boller [2], L. Cordis [1], M. Dahlem [1,3],
J. Englhauser [2], K. Molthagen [1], P. Nass [1,2], J. Studt [1], D. Reimers [1]

  1. Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
  2. Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany
  3. ESTEC, Astrophysics Division, Postbus 299, NL-2200 AG Noordwijk, The Netherlands

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 deg) 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.

Key words: X-ray sources: general - galaxies - stars

Contact: Dieter Engels.

Preprint (compressed PS-File,79 Kb)

Electronic version of the catalogue

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