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Microlensing pulsars

Published online by Cambridge University Press:  20 March 2013

Shi Dai  and
Renxin Xu
Shi Dai
Affiliation:
Department of Astronomy, School of Physics, Peking University, Beijing 100871, China email: daishi@pku.edu.cn, r.x.xu@pku.edu.cn
Renxin Xu
Affiliation:
Department of Astronomy, School of Physics, Peking University, Beijing 100871, China email: daishi@pku.edu.cn, r.x.xu@pku.edu.cn
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Abstract

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We propose to determine the mass of isolated neutron stars through gravitational microlensing. We show that the all-sky microlensing pulsar event rate is ~2.8 × 10−10 per year per background source (/yr/source). Microlensing neutron star event rate would contribute ~20% to the total Galactic event rate at time-scale of ~15 days. We also present catalogue comparisons between known pulsars and background stars. We find that several pulsars would pass by background stars closely and may cause observable astrometric microlensing phenomenon. According to our covariance analysis, the uncertainty of masses determined through astrometric microlensing could be ~20%. Therefore, gravitational microlensing is a promising way to determine the mass of isolated neutron stars with future advanced radio and optical telescopes.

Keywords

gravitational lensingpulsars: generalstars: neutron
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 369 - 371
Copyright
Copyright © International Astronomical Union 2013

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