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The fate of cooling gas in the centers of galaxy clusters and groups is stillnot well understood, as is also the case for the complex process of triggeringactive galactic nucleus (AGN) outbursts in their central dominant galaxies, andthe consequent re-heating of the gas by the AGN jets. With the largest knownreservoir of cold molecular gas of any group-dominant galaxy and three epochsof AGN activity visible as cavities in its hot gas, NGC 5044 is an ideal systemin which to study the cooling/AGN feedback cycle at the group scale. We presentVLBA observations of NGC 5044 to ascertain the current state of the centralAGN. We find a compact core and two small jets aligned almost in the plane ofthe sky, and in the orthogonal direction to the location of cavities. Weconstruct the radio/sub-mm spectral energy distribution (SED) over more thanthree orders of magnitude. We find that below 5 GHz the spectrum is best fit bya self-absorbed continuous injection model representing emission coming fromthe jets, while the higher frequencies show clear signs of an advectiondominated accretion flow. We derive a black hole mass and accretion rateconsistent with independent measurements. We conclude that the age of the jetsis much younger than the innermost cavities, marking the start of a newfeedback cycle.

A new feedback cycle in the archetypal cooling flow group NGC 5044