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Pinpointing a pulsar in its parent supernova remnant (SNR) or resultingpulsar wind nebula (PWN) is key for understanding its formation history, andthe pulsar wind mechanism. Yet, only about half the SNRs and PWNe appearassociated with a pulsar. We aim to find the pulsars in a sample of eight knownand new SNRs and PWNe. Using the LOFAR radio telescope at 150 MHz, each sourcewas observed for 3 hours. We covered the entire remnants where needed, byemploying many tied-array beams to tile out even the largest objects. Forobjects with a confirmed point source or PWN we constrained our search to thoselines of sight. We identify a promising radio pulsar candidate towards PWNG141.2+5.0. The candidate, PSR J0337+61, has a period of 94 ms and a DM of 226pc cm$^{-3}$. We re-observed the source twice with increased sensitivities of30% and 50% but did not re-detect it. It thus remains unconfirmed. For ourother sources we obtain very stringent upper limits of 0.8-3.1 mJy at 150 MHz.Generally we can rule out that the pulsars travelled out of the remnant. Fromthese strict limits we conclude our non-detections towards point-sources andPWNe are the result of beaming and propagation effects. Some of the remainingSNRs should host a black hole rather than a neutron star.

A LOFAR search for steep-spectrum pulsars in Supernova Remnants and Pulsar Wind Nebulae