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Astron. Astrophys. 363, 141-153 (2000)


Table of Contents
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Radio-loud active galaxies in the northern ROSAT All-Sky Survey

IV. Properties of sources stronger than 100 mJy at 5 GHz *

W. Reich 1, E. Fürst 1, P. Reich 1, R. Kothes 1, W. Brinkmann 2 and J. Siebert 2

1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2 Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85740 Garching, Germany

Received 8 February 2000 / Accepted 8 August 2000

Abstract

We present multi-frequency radio data for 741 extragalactic sources with a 5 GHz integrated flux density of [FORMULA] 100 mJy. These sources have been selected from a cross-correlation of an early ROSAT All-Sky Survey source list with a list of compact radio sources of the 5 GHz Green Bank northern sky survey (RGB sample). The majority of sources were quasi-simultaneously observed with the Effelsberg 100-m telescope at 11 cm, 6 cm, and 2.8 cm. We have determined the spectrum, size and linear polarization properties of these sources. We compare the radio data with ROSAT measurements and optical data. We find that the X-ray selected radio sources, when compared with unbiased radio source samples, are on average slightly more compact, show a higher fractional polarization, a higher absolute rotation measure (RM), and have flatter spectra. Absolute RMs are larger for steep spectrum than for flat spectrum sources and for extended than for compact sources. The average redshift increases with the radio flux density, which indicates that the X-ray selected radio sources have a larger fraction of beamed radio emission. All source characteristics of the sample are in accordance with present unification schemes for AGN, where X-ray selected sources are preferable looked at face on.

Key words: polarization – galaxies: active – quasars: general – radio continuum: general – X-rays: general

* Tables 1 and 2 are only available in electronic form at the CDS via anonymous ftp to ftp://cdsarc.u-strasbg.fr/pub/cats/J/A+A/363/141 (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/361/141

Present address: Dominion Radio Astrophysical Observatory, National Research Council of Canada, P.O. Box 248, Penticton, BC V2A 6K3, Canada

Send offprint requests to: W. Reich (wreich@mpifr-bonn.mpg.de)

© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000

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