A Dynamical Test for Cooling-Induced Entrainment in a Runaway Supermassive Black Hole Tail

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ID: 319814
2026
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Abstract
Abstract Radiative turbulent mixing layers are widely invoked to explain the survival, growth, and entrainment of cold gas in hot astrophysical flows, but quantitative dynamical tests have remained scarce. RBH-1, the first confirmed runaway supermassive black hole, offers a rare opportunity to test this framework: JWST observations show a 62 kpc tail of cold Hα and [O III]-emitting gas behind a source moving at ~950 km s−1 through the hot circumgalactic medium, with a coherent velocity gradient of ~200 km s−1 along the tail. Using 3D hydrodynamical simulations together with turbulent mixing-layer theory, we model the coherent downstream tail. We find that the observed downstream deceleration is well reproduced by accretion-induced drag from radiative mixing layers, and that without radiative cooling no coherent cold tail forms. We also derive a direct connection between the tail deceleration and the cooling luminosity, yielding predictions for future measurements of the cooling luminosity profile. RBH-1 therefore provides a rare quantitative dynamical stress test of radiative mixing-layer physics in an astrophysical system.
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openalex_W7167489352 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors I. K. Kaul, S Peng Oh
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1275
URL
https://doi.org/10.1093/mnras/stag1275
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