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Spatial offset between mm-wave emission and the accretion disk in RXJ1131-1231

Determine the spatial separation, if any, between the millimeter-wave emission region (attributed to the corona) and the accretion disk traced by rest-frame UV emission in RXJ1131-1231, which remains unconstrained with the two available ALMA epochs.

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Background

The analysis assumes co-centric mm-wave and optical emission but acknowledges possible offsets (e.g., in lamp-post models). The inferred size constraints are tested for sensitivity to this assumption; removing the co-spatiality constraint inflates the upper limit, indicating the importance of establishing any offset.

Quantifying this separation would refine microlensing-based source size inferences and inform geometric models of the corona relative to the accretion disk.

References

While we cannot constrain the separation between the accretion disc and the mm-wave emission from two ALMA epochs, we can determine how the size of the mm-wave source depends on the co-spatiality assumption.

— Detection of millimeter-wave coronal emission in a quasar at cosmological distance using microlensing (2503.13313 - Rybak et al., 17 Mar 2025) in Section 3.1 (Microlensing analysis)