New Radio Millisecond Pulsars in Fermi (Formerly) Unassociated Sources

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We have used the Green Bank Telescope (GBT) to search for radio pulsars in 25 of the non-variable unassociated sources in the Fermi LAT Bright Source List. Eight of these sources are at high Galactic latitudes and initial searches have shown that half of them (4 of 8) contain bright radio millisecond pulsars. All of these pulsars are in binary systems which would have made them virtually impossible to detect in blind gamma-ray pulsation searches. The orbital parameters of the binaries are quite varied, but the distances to the pulsars implied by their dispersion measures are all quite nearby (<2 kpc). We discuss the gamma-ray properties of these sources and interesting aspects of the orbits or radio emission. In addition we discuss the implications of the detection of these systems on the radio emission mechanism and on other projects requiring bright radio millisecond pulsars such as the detection of gravitational waves via a pulsar timing array.

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