The radio-loudness dichotomy: environment or black-hole mass?

Details The radio-loudness dichotomy: environment or black-hole mass? The radio-loudness dichotomy: environment or black-hole mass?

2001-02-09

arxiv.org/abs/astro-ph/0102166v1

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures, to appear in the proceedings of the workshop on "QSO hosts and their environments", IAA, Granada, 10-12 Ja

Scientific paper

The results of a comprehensive study of the cluster environments and black-hole masses of an optically matched sample of radio-loud and radio-quiet quasars are presented. No evidence is found for a difference in large-scale environments, with both quasar classes found to be located in clusters of Abell class $\sim0$ . Conversely, virial black-hole mass estimates based on H$_{\beta}$ line-widths show a clear difference in the quasar black-hole mass distributions. Our results suggest that a black-hole mass of $\sim10^{9}\Msolar$ is required to produce a powerful radio-loud quasar, and that it is black-hole mass and accretion rate which hold the key to the radio-loudness dichotomy.

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