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Astron. Astrophys. 352, 437-442 (1999)

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ROSAT HRI observations of radio-loud AGN

M. Gliozzi 1, W. Brinkmann 1, S.A. Laurent-Muehleisen *  2, L.O. Takalo 3 and A. Sillanpää 3

1 Max-Planck-Institut für Extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany
2 University of California - Davis and the Institute for Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, Livermore, CA 94450, USA
3 Tuorla Observatory, University of Turku, 215000 Piikkiö, Finland

Received 24 August 1999 / Accepted 2 November 1999


We present the results of three ROSAT HRI observations of AGN expected to reside in clusters of galaxies. Although the exposures were truncated by the premature end of the ROSAT mission, valuable information could be achieved which greatly improved upon the previous PSPC results.

For RGB 1745+398 we could separate the cluster emission from that of the BL Lac and could confirm the cluster parameters obtained from optical follow-up observations. In MRC 0625-536 the flux from the central point source contributes less than 3% to the total X-ray flux and the eastern component of the dumbbell galaxy seems to be the X-ray emitter. RXJ1234.6+2350 appears to be extended in X-rays. The X-ray flux is centered on a quasar, but optical spectroscopy indicates that the nearby radio galaxies reside in a previously unknown cluster at redshift z[FORMULA]0.134.

Key words: galaxies: active – galaxies: fundamental parameters – galaxies: ISM – galaxies: nuclei – X-rays: galaxies

* Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation

Send offprint requests to: M. Gliozzi (mgliozzi@xray.mpe.mpg.de)

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© European Southern Observatory (ESO) 1999

Online publication: December 2, 1999