Unveiling the fastest Pulsating ULXs

The recent discovery of a handfuln of ULXs showing pulsations (PULXs)unambiguously associated them to neutron stars (NSs) exceeding up to about 500times their L_Edd. During AO17 we were awarded a LP aimed at searching for newPULXs within 8 fields containing promising candidates. So far we obtained datafor half of sample and we discovered one new PULX. This result confirms thegoodness of the LP adopted strategy and that a relatively large fraction of ULXslikely hosts an accreting NS. The present proposal is aimed at observing twobright (high flux) ULXs in Timing mode and at looking for coherent signals overa period range (1ms<P<100ms). The detection of even one very fast PULX would bevery important for constraining NS accretion models as well as binary systems. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]