A sample of radio galaxies spanning three decades in radio luminosity - I. The host-galaxy properties and black-hole masses

Details A sample of radio galaxies spanning three decades in radio luminosity - I. The host-galaxy properties and black-hole masses A sample of radio galaxies spanning three decades in radio luminosity - I. The host-galaxy properties and black-hole masses

2004-03-04

arxiv.org/abs/astro-ph/0403106v1

Mon.Not.Roy.Astron.Soc. 351 (2004) 347

Astronomy and Astrophysics

Astrophysics

17 pages, 10 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07793.x

The results of analysis of HST I-band imaging of a sample of 41 radio galaxies spanning three orders of magnitude in radio luminosity at redshift z~0.5 are presented. The full sample is drawn from four complete, low-frequency selected radio samples with progressively fainter flux-density limits (3CRR, 6CE, 7CRS and the new TexOx-1000 sample). Modelling of the HST imaging data shows that the host galaxies have surface-brightness distributions consistent with those expected for classic ellipticals (Sersic parameter, beta~0.25), with beta in the range 0.17=0.23\pm0.01. The host-galaxy luminosities are comparable with those of galaxies drawn from the bright end of the local cluster galaxy luminosity function, spanning the range 0.7L^{\star}=10^{8.87\pm 0.04}\Msun. Finally, a significant (~3 sigma) correlation is found between black-hole mass and 151-MHz radio luminosity for those objects in the sample with either high-excitation nuclear spectra or classical double radio structures. (abridged)

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