Accurate Black Hole Mass Measurements for Thermal AGNs and the Origin of the Correlations Between Black Hole Mass and Bulge Properties

Details Accurate Black Hole Mass Measurements for Thermal AGNs and the Origin of the Correlations Between Black Hole Mass and Bulge Properties Accurate Black Hole Mass Measurements for Thermal AGNs and the Origin of the Correlations Between Black Hole Mass and Bulge Properties

2011-11-08

arxiv.org/abs/1111.2067v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

SF2A-2011: Proceedings of the 2011 annual meeting of the French Society of Astronomy and Astrophysics. G. Alecian, K. Belkacem

Scientific paper

A simple refinement is proposed to the Dibai method for determining black hole masses in type-1 thermal AGNs. Comparisons with reverberation mapping black hole masses and host galaxy bulge properties suggest that the method is accurate to +/- 0.15 dex. Contrary to what was thought when the black hole mass - stellar velocity dispersion ("M - sigma") relationship was first discovered, it does not have a lower dispersion than the black hole mass - bulge luminosity ("M - L") relationship. The dispersion in the M - L relationship for AGNs decreases strongly with increasing black hole mass or bulge luminosity. This is naturally explained as a consequence of the black hole - bulge relationships being the result of averaging due to mergers. Simulations show that the decrease in dispersion in the M - L relationship with increasing mass is in qualitative agreement with being driven by mergers. The large scatter in AGN black hole masses at lower masses rules out significant AGN feedback. A non-causal origin of the correlations between black holes and bulges explains the frequent lack of supermassive black holes in late-type galaxies, and the lack of correlation of black hole mass with pseudo-bulges.

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