August 2015


How many AGN are triggered by galaxy mergers?

As a follow up of the last ‘plot of the month’, this plot answers the question how many AGN are actually triggered by galaxy mergers.
The simulation we use here is ‘Box3 hr’ of the Magneticum simulations (see for details).
It shows the fraction of AGN triggered by mergers in bins of the bolometric AGN luminosity for stellar merger mass ratios >1:4 (solid lines), >1:10 (dashed lines) and >1:50 (dotted lines). The colours represent different redshifts. As found observationally by Treister et al. (2012), we also see that the fraction of AGN triggered by mergers clearly increases with AGN luminosity.