Highly Dispersed Pulsar and Three Others

FOUR further pulsars have been discovered at the Molonglo radio observatory during a pulsar search at 408 MHz. One of the four pulsars, MP 0254, a high galactic latitude pulsar, was discovered in November 1968, but failed to appear on any of some twenty subsequent transits. In a recent observing session this pulsar was observed twice, allowing measurement of the dispersion and pulse width. Two of the pulsars (MP 1706 and MP 1911) were among many suspected pulsars noted during a close re-examination of the search records made since October 1968 using the two beam technique which led to the discovery of eighteen pulsars1–4. Recent observations have confirmed the existence of MP 1706 and MP 1911, and have enabled their properties to be measured. The fourth pulsar, MP 1154, was discovered during a search for high dispersion pulsars along the galactic plane using a two channel dispersion remover which was described in connexion with the discovery of MP 1240 (ref. 3).