A Galaxy-Scale Fountain of Cold Molecular Gas Pumped by a Black Hole
Grant R. Tremblay, Fran\c{c}oise Combes, J. B. Raymond Oonk, Helen R., Russell, Michael A. McDonald, Massimo Gaspari, Bernd Husemann, Paul E. J., Nulsen, Brian R. McNamara, Stephen L. Hamer, Christopher P. O'Dea, Stefi A., Baum, Timothy A. Davis, Megan Donahue, G. Mark Voit

TL;DR
This study uses ALMA and MUSE observations to reveal a galaxy-wide fountain of cold molecular gas driven by black hole activity, supporting models of galaxy evolution involving feedback and accretion processes.
Contribution
It provides detailed observational evidence of a galaxy-scale cold gas fountain linked to black hole feedback, supporting theoretical models of galaxy evolution.
Findings
Cold molecular and warm ionized gas are cospatial and comoving.
Gas clouds show inflow, outflow, and uplift, indicating a fountain mechanism.
Velocities are below escape speed, suggesting a long-lived cycle.
Abstract
We present ALMA and MUSE observations of the Brightest Cluster Galaxy in Abell 2597, a nearby (z=0.0821) cool core cluster of galaxies. The data map the kinematics of a three billion solar mass filamentary nebula that spans the innermost 30 kpc of the galaxy's core. Its warm ionized and cold molecular components are both cospatial and comoving, consistent with the hypothesis that the optical nebula traces the warm envelopes of many cold molecular clouds that drift in the velocity field of the hot X-ray atmosphere. The clouds are not in dynamical equilibrium, and instead show evidence for inflow toward the central supermassive black hole, outflow along the jets it launches, and uplift by the buoyant hot bubbles those jets inflate. The entire scenario is therefore consistent with a galaxy-spanning "fountain", wherein cold gas clouds drain into the black hole accretion reservoir, powering…
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Taxonomy
TopicsCosmology and Gravitation Theories · Black Holes and Theoretical Physics · Atomic and Subatomic Physics Research
