A molecular absorption line survey toward the AGN of Hydra-A
Tom Rose (1), A. C. Edge (1), F. Combes, S. Hamer, B. R. McNamara, H., Russell, M. Gaspari, P. Salom\'e, C. Sarazin, G. R. Tremblay, S. A. Baum, M., N. Bremer, M. Donahue, A. C. Fabian, G. Ferland, N. Nesvadba, C. O'Dea, J. B., R. Oonk

TL;DR
This study uses ALMA to observe molecular absorption lines in Hydra-A's nucleus, revealing a clumpy, dynamic interstellar medium with at least 12 molecular clouds and potential variability over two years.
Contribution
First detailed molecular absorption line survey of Hydra-A's nucleus, uncovering a complex, clumpy interstellar medium with evidence of cloud motions and variability.
Findings
Detected multiple molecular absorption lines indicating at least 12 clouds.
Found clouds have properties similar to Milky Way clouds at several kpc.
Observed potential absorption profile variability over two years.
Abstract
We present Atacama Large Millimeter/submillimeter Array observations of the brightest cluster galaxy Hydra-A, a nearby () giant elliptical galaxy with powerful and extended radio jets. The observations reveal CO(1-0), CO(2-1), CO(2-1), CN(2-1), SiO(5-4), HCO(1-0), HCO(2-1), HCN(1-0), HCN(2-1), HNC(1-0) and HCO(3-2) absorption lines against the galaxy's bright and compact active galactic nucleus. These absorption features are due to at least 12 individual molecular clouds which lie close to the centre of the galaxy and have velocities of approximately to km/s relative to its recession velocity, where positive values correspond to inward motion. The absorption profiles are evidence of a clumpy interstellar medium within brightest cluster galaxies composed of clouds with similar column densities, velocity dispersions and excitation temperatures…
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