AGN-galaxy co-evolution: Making a case for a paradigm change

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The current paradigm of black hole--galaxy co-evolution is driven in part by theoretical models of hierarchical galaxy formation. The observed correlations between BH mass and bulge properties of host galaxies are naturally explained by these merger-driven models. Recent developments, however, question all aspects of the current paradigm, and here I list some of them. (1) The correlation between BH mass and bulge sigma is found to be not as tight as previously thought. (2) We found significant outliers to the BH-bulge relations. (3) Supermassive BHs exist in bulge-less galaxies. (4) The feedback is observed to be several orders of magnitude below what is required, except in most luminous quasars. (5) Pseudo-bulges host BHs. (6) While the correlation between AGN luminosity and star formation rate at high redshift supports the current paradigm, new observations with Herschel show this to be a selection effect; the correlation disappears when lower luminosity AGNs are included; we found a similar lack of correlation in the low-redshift sample of SINGS galaxies. This last point is the subject of this conference. I will discuss this, and time permitting other aspects to argue for alternative tracks of AGN--galaxy co-evolution.

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