Measurement of Pulsar Distances by Galactic Hydrogen Absorption

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Scientific paper

THE wide band radiation from a pulsar will be absorbed near a wavelength of 21 cm by the galactic neutral hydrogen lying between the Earth and the pulsar. On the other hand, the 21 cm emission from neutral hydrogen in directions adjacent to the pulsar's position comes from the whole path length through the galaxy. A comparison of these two types of spectra may therefore lead to an estimate of the distance to the pulsar. A measurement has already been made at Jodrell Bank1 on CP 0328, yielding a lower limit of 4 kpc for this particular source.

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