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From a sample of 50 predominantly inactive galaxies with direct supermassiveblack hole mass measurements, it has recently been established that barredgalaxies tend to reside rightward of the M_bh-sigma relation defined bynon-barred galaxies. Either black holes in barred galaxies tend to be anaemicor the central velocity dispersions in these galaxies have a tendency to beelevated by the presence of the bar. The latter option is in accord withstudies connecting larger velocity dispersions in galaxies with old bars, whilethe former scenario is at odds with the observation that barred galaxies do notdeviate from the M_bh-luminosity relation. Using a sample of 88 galaxies withactive galactic nuclei, whose supermassive black hole masses have beenestimated from their associated emission lines, we reveal for the first timethat they also display this same general behavior in the M_bh-sigma diagramdepending on the presence of a bar or not. A new symmetrical andnon-symmetrical "barless" M_bh-sigma relation is derived using 82 non-barredgalaxies. The barred galaxies are shown to reside on or up to ~1 dex below thisrelation. This may explain why narrow-line Seyfert 1 galaxies appear offsetfrom the "barless" M_bh-sigma relation, and has far reaching implications giventhat over half of the disk galaxy population are barred.

The M_bh-sigma diagram, and the offset nature of barred active galaxies