Abstract
We highlight some of the principal results from our recent Hubble Space Telescope studies of quasars and radio galaxies. The hosts of these powerful AGN are normal massive ellipticals which lie on the region of the fundamental plane populated predominantly by massive ellipticals with boxy isophotes and distinct cores. The hosts of the radio-loud sources are on average similar or equal to 1.5 times brighter than their radio-quiet counterparts and appear to lie above a mass threshold M-sph > 4 x 10(11) M-circle dot. This suggests that black holes more massive than M-bh > 5 x 10(8) M-circle dot are required to produce a powerful radio source. However we show that this apparent threshold appears to be a consequence of an upper bound on radio output which is a strong function of black-hole mass, L-5GHz proportional to M-bh(2 5). This steep mass dependence can explain why the hosts of the most powerful radio sources are good standard candles. Such objects were certainly fully assembled by z similar or equal to 1, and appear to have formed the bulk of their stars prior to z similar or equal to 3.
| Original language | English |
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| Title of host publication | MASS OF GALAXIES AT LOW AND HIGH REDSHIFT |
| Editors | T Bender, A Renzini |
| Place of Publication | BERLIN |
| Publisher | Springer-Verlag GmbH |
| Pages | 268-273 |
| Number of pages | 6 |
| ISBN (Print) | 3-540-00205-7 |
| Publication status | Published - 2003 |
| Event | Workshop on the Mass of Galaxies at Low and High Redshift - VENICE Duration: 24 Oct 2001 → 26 Oct 2001 |
Conference
| Conference | Workshop on the Mass of Galaxies at Low and High Redshift |
|---|---|
| City | VENICE |
| Period | 24/10/01 → 26/10/01 |