SIMBAD references

2020ApJ...895...93C - Astrophys. J., 895, 93-93 (2020/June-1)

Quasar microlensing variability studies favor shallow accretion disk temperature profiles.


Abstract (from CDS):

We compare the microlensing-based continuum emission region size measurements in a sample of 15 gravitationally lensed quasars with estimates of luminosity-based thin disk sizes to constrain the temperature profile of the quasar continuum accretion region. If we adopt the standard thin disk model, we find a significant discrepancy between sizes estimated using the luminosity and those measured by microlensing of log(rL/rµ) = -0.57 ± 0.08 dex. If quasar continuum sources are simple, optically thick accretion disks with a generalized temperature profile T(r)∝r^-β^, the discrepancy between the microlensing measurements and the luminosity-based size estimates can be resolved by a temperature profile slope 0.37 < β < 0.56 at 1σ confidence. This is shallower than the standard thin disk model (β = 0.75) at 3σ significance. We consider alternate accretion disk models that could produce such a temperature profile and reproduce the empirical continuum size scaling with black hole mass, including disk winds or disks with nonblackbody atmospheres.

Abstract Copyright: © Contribution of US Naval Academy; not subject to copyright in the United States

Journal keyword(s): Quasar microlensing - Gravitational lensing - Accretion - Quasars

Simbad objects: 16

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2020ApJ...895...93C and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact