research
One Side of an Accretion Disk Kept Time Differently
A three-dimensional radiation simulation links disk thickness to longer optical lags and weaker correlation with X-rays.
Summary
A three-dimensional radiation simulation links disk thickness to longer optical lags and weaker correlation with X-rays.
A 3D multi-frequency radiation-magnetohydrodynamic simulation produced an active-galactic-nucleus disk that was thinner above its midplane and thicker below. Light from the thin side broadly followed traditional X-ray reprocessing expectations. The thicker side absorbed more X-rays, showed stronger intrinsic variability and produced continuum lags three to five times longer than light-travel time—features closer to several recent observations. The authors argue that disk structure could help explain the long-standing apparent disk-size problem without requiring the broad-line region to dominate the lag. This is a simulation-based interpretation, not a direct measurement of a particular galaxy.
Why it matters
A three-dimensional radiation simulation links disk thickness to longer optical lags and weaker correlation with X-rays.
Limits and context
- This is a simulation-based interpretation, not a direct measurement of a particular galaxy.
Key claims
A three-dimensional radiation simulation links disk thickness to longer optical lags and weaker correlation with X-rays.
Qualification: This is a simulation-based interpretation, not a direct measurement of a particular galaxy.
Evidence: source-2026-10-10-007
Sources
- arXiv preprint 2610.12462, original v1arXiv / submitting research authors · primary research
Corrections
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