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While the cooling of the hot intra-cluster medium (ICM) in the cores ofgalaxy clusters is mostly counteracted by heating from the central activegalactic nucleus (AGN), the balance is not perfect. This can lead to residualcooling flows and low-level star formation, the physics of which is not wellunderstood. Here we present a detailed study of the residual cooling flow inthe center of the low mass galaxy cluster Sersic 159-03 (A S1101) usingfar-ultraviolet imaging from the Hubble Space Telescope and far-infrared (FIR)spectroscopy and photometry from the Herschel space observatory, along with awealth of archival data. We detect extended emission at UV, FIR, and [CII],indicating a star formation rate of ~1-3 Msun/yr, depending on the indicatorand assumptions made. The most recently formed stars appear spatiallycoincident with the lowest entropy ICM. We speculate that this low-entropy gashas been displaced by the central AGN ~7.5 kpc north of the cD galaxy. Thesedata demonstrate that the displacement of the cooling core from the directvicinity of the central AGN can temporarily break the feedback cycle and leadto cooling and star formation that is offset from the center of the galaxy. Wefind an abundance (~10^7 Msun) of cold (20K) dust in the center of the clusterand a second FIR peak ~30kpc to the north of the central galaxy. If confirmedto be associated with the cooling filaments, this would be the most extendedcomplex of dust yet found in a cool core cluster.

Extended, Dusty Star Formation Fueled by a Residual Cooling Flow in the Cluster of Galaxies Sersic 159-03