A millisecond pulsar discovery in a survey of unidentified Fermi $\gamma$-ray sources with LOFAR
- Pleunis, Z.
- Bassa, C.G.
- Hessels, J.W.T.
- Kondratiev, V.I.
- Camilo, F.
- Cognard, I.
- Griessmeier, J. -M.
- Stappers, B.W.
- van Amesfoort, A.S.
- Sanidas, S.
DOIAbstract
International audienceUsing LOFAR, we have performed a very-low-frequency (115−155 MHz) radio survey for millisecond pulsars (MSPs). The survey targeted 52 unidentified Fermi γ-ray sources. Employing a combination of coherent and incoherent dedispersion, we have mitigated the dispersive effects of the interstellar medium while maintaining sensitivity to fast-spinning pulsars. Toward 3FGL J1553.1+5437 we have found PSR J1552+5437, the first MSP to be discovered (through its pulsations) at a radio frequency <200 MHz. PSR J1552+5437 is an isolated MSP with a 2.43 ms spin period and a dispersion measure of 22.9 pc cm(−)(3). The pulsar has a very steep radio spectral index ($\alpha \lt -$2.8 ± 0.4). We obtain a phase-connected timing solution co...
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