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We report on the discovery of 41 new pulsating sources in the data of theChandra Advanced CCD Imaging Spectrometer, which is sensitive to X-ray photonsin the 0.3-10 keV band. The archival data of the first 15 years of Chandraobservations were retrieved and analysed by means of fast Fourier transforms,employing a peak-detection algorithm able to screen candidate signals in anautomatic fashion. We carried out the search for new X-ray pulsators in lightcurves with more than 50 photons, for a total of about 190,000 lightcurves outof about 430,000 extracted. With these numbers, the ChAndra Timing Survey atBrera And Roma astronomical observatories (CATS@BAR) - as we called the project- represents the largest ever systematic search for coherent signals in theclassic X-ray band. More than 50 per cent of the signals were confirmed byfurther Chandra (for those sources with two or more pointings), XMM-Newton orROSAT data. The period distribution of the new X-ray pulsators above about2,000s resembles that of cataclysmic variables, while there is a paucity ofsources with shorter period and low fluxes. Since there is not an obvious biasagainst these detections, a possible interpretation is in terms of a magneticgating mechanism in accreting neutron stars. Finally, we note that CATS@BAR isa living project and the detection algorithm will continue to be routinelyapplied to the new Chandra data as they become public. Based on the resultsobtained so far, we expect to discover about three new pulsators every year.

The Chandra ACIS Timing Survey Project: glimpsing a sample of faint X-ray pulsators