FR0 radio galaxies are abundant compact sources whose small sizes challenge standard evolutionary models, and SKA observations are expected to clarify their jet physics and demographics.
The Cosmic Density of Massive Black Holes from Galaxy Velocity Dispersions
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abstract
Supermassive black holes are thought to be relics of quasars, and their numbers and masses are therefore related to the quasar luminosity function and its evolution with redshift. We have used the relationship between black hole mass and bulge velocity dispersion (the M_bullet - sigma relation) to make an improved estimate of the mass density and mass spectrum of supermassive black holes. Uncertainties in the M_bullet - sigma relation have little effect on the mass density. We find a mass density of (4.8 +/- 1.6) h^2 x 10^5 M_sun Mpc^-3. Some of the variance in published density estimates comes from the use of different values of the Hubble constant.
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astro-ph.GA 1years
2026 1verdicts
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Compact radio galaxies: the case of FR0s
FR0 radio galaxies are abundant compact sources whose small sizes challenge standard evolutionary models, and SKA observations are expected to clarify their jet physics and demographics.