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We performed a deep wide field optical survey of the young (~100-150 Myr)open cluster Blanco1 to study its low mass population well down into the browndwarf regime and estimate its mass function over the whole cluster massrange.The survey covers 2.3 square degrees in the I and z-bands down to I ~ z ~24 with the CFH12K camera. Considering two different cluster ages (100 and 150Myr), we selected cluster member candidates on the basis of their location inthe (I,I-z) CMD relative to the isochrones, and estimated the contamination byforeground late-type field dwarfs using statistical arguments, infraredphotometry and low-resolution optical spectroscopy. We find that our surveyshould contain about 57% of the cluster members in the 0.03-0.6 Mo mass range,including 30-40 brown dwarfs. The candidate's radial distribution presentsevidence that mass segregation has already occured in the cluster. We took itinto account to estimate the cluster mass function across thestellar/substellar boundary. We find that, between 0.03Mo and 0.6Mo, thecluster mass distribution does not depend much on its exact age, and is wellrepresented by a single power-law, with an index alpha=0.69 +/- 0.15. Over thewhole mass domain, from 0.03Mo to 3Mo, the mass function is better fitted by alog-normal function with m0=0.36 +/- 0.07Mo and sigma=0.58 +/- 0.06. Comparisonbetween the Blanco1 mass function, other young open clusters' MF, and thegalactic disc MF suggests that the IMF, from the substellar domain to thehigher mass part, does not depend much on initial conditions. We discuss theimplications of this result on theories developed to date to explain the originof the mass distribution.

The lower mass function of the young open cluster Blanco 1: from 30 Mjup to 3 Mo