Timing of the proposed optical counterpart of the 16 ms LMC X-ray pulsar PSR J0537-6910

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Hst Proposal Id #9868 Hot Stars

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PSR J0537-6910 is a fast, young { 5, 000 yrs} X-ray pulsar -still undetected in radio- at the the center of the SNR N157B in the LMC. PSR J0537-6910 is a champion pulsar - with a period of 16 ms it is the fastest rotator among ordinary pulsars, with the sharpest X-ray pulse among young pulsars. It is the most energetic one {together with the Crab}, with a rotational energy loss log{dE/dt} 38.7 erg/s, and its space velocity {> 1, 000 km/s}, inferred from the shape of its X-ray bow-shock nebula, is probably one of the highest in the pulsar family. Taking advantage of the refined Chandra position of the X-ray pulsar, we have recently performed multi-band high-resolution imaging with the ACS {GO 9471} and we found a potential counterpart, characterized by unusual colours. Here, we propose to observe the candidate counterpart with the STIS/NUV-MAMA in its TIME-TAG mode to search for pulsations at the X-ray period, which would unambiguously confirm the proposed identification.

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