PSR J0751+18: a New Binary Millisecond Pulsar in an EGRET Source Error Box

Astronomy and Astrophysics – Astronomy

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Scientific paper

We have discovered a new binary millisecond pulsar in an EGRET source error box. The discovery was made in a pulsar search conducted at Arecibo observatory targeted at the unidentified EGRET high energy gamma -ray source error boxes. The pulsar has a 3.5 ms spin period, an 8.5 hour orbital period, a 430 MHz flux density of 10 mJy, and a dispersion measure of 30 pc cm(-3) . The mass function is 0.001 Msun, setting a lower limit on the companion mass of 0.14 Msun for an assumed pulsar mass of 1.4 Msun. We present results of our analysis of ROSAT and EGRET observations to determine whether the high energy emission is associated with the millisecond pulsar. Possible models for such a system are considered.

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