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The soft X-ray properties of a complete sample of radio sources

The soft X-ray properties of a complete sample of radio sources We present the soft X-ray (0.1–2.4 keV) properties of a complete sample of 88 southern radio sources derived from the Wall & peacock 2-Jy sample. It comprises 68 radio galaxies, 18 quasars and 2 BL Lac objects. Whereas both BL Lac objects and all but one quasar are detected in the ROSAT All-Sky Survey, the fraction of detected radio galaxies is only ∼ 60 per cent. For the undetected sources upper limits to the X-ray flux are given. We confirm the correlation of the soft X-ray luminosity (Lx) with the core radio luminosity (Lr,core) for galaxies as well as for quasars using partial correlation analysis, whereas the corresponding correlations between Lx and Lr,total are probably spurious due to sample selection effects. We also find strong correlations between Lx and Lr,core for both Fanaroff-Riley type I (FR I) and type II galaxies. The broad-line radio galaxies (BLRGs) and the quasars are at the top end of the X-ray luminosity distribution and the detection rate of these objects generally is higher than that of the narrow- or weak-lined radio galaxies. This indicates the presence of an anisotropic X-ray component in BLRGs and quasars, as predicted by unified schemes for radio sources. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Monthly Notices of the Royal Astronomical Society Oxford University Press

The soft X-ray properties of a complete sample of radio sources

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References (9)

Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
ISSN
0035-8711
eISSN
1365-2966
DOI
10.1093/mnras/279.4.1331
Publisher site
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Abstract

We present the soft X-ray (0.1–2.4 keV) properties of a complete sample of 88 southern radio sources derived from the Wall & peacock 2-Jy sample. It comprises 68 radio galaxies, 18 quasars and 2 BL Lac objects. Whereas both BL Lac objects and all but one quasar are detected in the ROSAT All-Sky Survey, the fraction of detected radio galaxies is only ∼ 60 per cent. For the undetected sources upper limits to the X-ray flux are given. We confirm the correlation of the soft X-ray luminosity (Lx) with the core radio luminosity (Lr,core) for galaxies as well as for quasars using partial correlation analysis, whereas the corresponding correlations between Lx and Lr,total are probably spurious due to sample selection effects. We also find strong correlations between Lx and Lr,core for both Fanaroff-Riley type I (FR I) and type II galaxies. The broad-line radio galaxies (BLRGs) and the quasars are at the top end of the X-ray luminosity distribution and the detection rate of these objects generally is higher than that of the narrow- or weak-lined radio galaxies. This indicates the presence of an anisotropic X-ray component in BLRGs and quasars, as predicted by unified schemes for radio sources.

Journal

Monthly Notices of the Royal Astronomical Society – Oxford University Press

Published: Apr 11, 1996

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