AGNs Optical/MIR time series analysis properties

For {beta} = 0.5, by combining with the previous K band RM measurements, we obtain the characteristic broad-line region (BLR) and tours sizes following R_BLR_ : R_K_ : R_W1_ : R_W2_ = 1.0 : 6.2 : 9.2 : 11.2. We investigate the deviations of the W1 and W2 band observed torus sizes from the corresponding best-fitting relations (with {beta} = 0.5) and find that they both are correlated with accretion rate. As the accretion rate increases, the torus sizes tend to be shortened compared to the anticipated sizes from the best-fitting relations, similar to the behaviour found in BLRs.

Such behaviours can be explained by the self-shadowing effect of slim discs. This is further supported by ratios of the W1 and W2 band torus sizes to BLR sizes, which do not show significant correlations with AGN properties.