Revisiting the dust torus size-luminosity relation based on a uniform reverberation mapping analysis
The Astrophysical Journal(2024)
摘要
We investigate the torus size – luminosity relation of Type 1 AGNs based on
the reverberation-mapping analysis using the light curves of the optical
continuum and the IR continuum obtained with the W1 and W2-bands of the
Wide-field Infrared Survey Explorer (WISE) survey. The final sample consists of
446 and 416 AGNs, respectively, for W1 and W2-band light curves, covering a
large dynamic range of bolometric luminosity from 10^43.4 to 10^47.6
erg s^-1, which show reliable lag measurements based on our quality
assessment analysis. After correcting for the accretion disk contamination in
the observed IR flux, we constrain the torus size (R_dust) and AGN
bolometric luminosity (L_bol) relationship with the best-fit slope of 0.39
(0.33) for the W1- (W2-) band, which is shallower than expected from the dust
radiation equilibrium model. By combining the previous K-band lag measurements,
we find that the measured torus size depends on the observed wavelength of the
dust radiation, as R_dust,K:R_dust,W1:R_dust,W2 = 1.0:1.5:1.8
(R_dust ∝ λ^0.80) at L_bol = 10^46 erg
s^-1, confirming a stratified structure of the torus, where
wavelength-dependent emissions originate from distinct regions of the torus. By
investigating the deviation from the best-fit torus size – luminosity
relation, we find a moderate correlation between the offset from the
R_dust–L_bol relation and Eddington ratio. This suggests a possible
influence of the Eddington ratio on the observed flattening of the
R_dust–L_bol relationship.
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关键词
Reverberation mapping,Black holes,Active galactic nuclei,Quasars
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