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Dai, S.; Lin, M. X.; Xu, R. X.; Smith, M. C.; Yue, Y. L.; Hobbs, G., E-mail: daishi@pku.edu.cn, E-mail: msmith@shao.ac.cn2015
AbstractAbstract
[en] We investigate properties of Galactic microlensing events in which a stellar object is lensed by a neutron star. For an all-sky photometric microlensing survey, we determine the number of lensing events caused by potentially observable radio pulsars to be for 1010 background stellar sources. We expect a few detectable events per year for the same number of background sources from an astrometric microlensing survey. We show that such a study could lead to precise measurements of radio pulsar masses. For instance, if a pulsar distance could be constrained through radio observations, then its mass would be determined with a precision of . We also investigate the timescale distributions for neutron star events, finding that they are much shorter than had been previously thought. For photometric events toward the Galactic center that last ∼15 days, around 7% will have a neutron star lens. This fraction drops rapidly for longer timescales. Away from the bulge region we find that neutron stars will contribute of the events that last less than ∼10 days. These results are in contrast to earlier work which found that the maximum fraction of neutron star events would occur on timescales of hundreds of days.
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Available from http://dx.doi.org/10.1088/0004-637X/802/2/120; Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.
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