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We present the scaling relation between Sunyaev-Zeldovich (SZ) signal andstellar mass for almost 260,000 locally brightest galaxies (LBGs) selected fromthe Sloan Digital Sky Survey (SDSS). These are predominantly the centralgalaxies of their dark matter halos. We calibrate the stellar-to-halo massconversion using realistic mock catalogues based on the Millennium Simulation.Applying a multi-frequency matched filter to the Planck data for each LBG, andaveraging the results in bins of stellar mass, we measure the mean SZ signaldown to $M_\ast\sim 2\times 10^{11} \Msolar$, with a clear indication of signalat even lower stellar mass. We derive the scaling relation between SZ signaland halo mass by assigning halo properties from our mock catalogues to the realLBGs and simulating the Planck observation process. This relation shows noevidence for deviation from a power law over a halo mass range extending fromrich clusters down to $M_{500}\sim 2\times 10^{13} \Msolar$, and there is aclear indication of signal down to $M_{500}\sim 4\times 10^{12} \Msolar$.Planck's SZ detections in such low-mass halos imply that about a quarter of allbaryons have now been seen in the form of hot halo gas, and that this gas mustbe less concentrated than the dark matter in such halos in order to remainconsistent with X-ray observations. At the high-mass end, the measured SZsignal is 20% lower than found from observations of X-ray clusters, adifference consistent with Malmquist bias effects in the X-ray sample.

Planck Intermediate Results. XI: The gas content of dark matter halos: the Sunyaev-Zeldovich-stellar mass relation for locally brightest galaxies