On Pulsar Distances and Emission

Abstract

IT has been suggested to us that it would be useful to extend the list of pulsar distances which two of us computed earlier^1,2 to include those pulsars which have been discovered since then. In Table VII of ref. 2 we listed distances of thirty-six pulsars. We now list the results for another eighteen, six of which were mentioned previously² in a note added in proof. The results are given in Table 1. Because a plot of pulsar distribution against height z above the galactic plane shows a sharp distinction between those objects for which a precise distance was found and those for which we use equation 44 of ref. 2, we have adopted l=200 |sin b|⁻¹ pc as a lower bound distance estimate for pulsars with n₀(∞)≳0.05 cm⁻³ whose line of sight does not intersect an HII region. For the Jodrell pulsars we have used the data of Davies, Large and Pickwick^3,4.