’seeing Double’

Part of the Springer Praxis Books book series (PRAXIS)


The initial observation took less than five minutes. A 23 millisecond pulsar 2000 light years away in the constellation of Puppis. Even from the first discovery observation, it was clear that the pulsar was in a short-period binary orbit. Follow up observations revealed signs that the companion was massive, perhaps even a neutron star. Binary pulsars had been discovered before — 80 had been found before this one, and there are now 134 known. The first resulted in Hulse and Taylor receiving the Nobel Prize (see Chapter 9). But while these systems involve a pulsar orbiting with a neutron star, the neutron star companions remained relatively anonymous: even if they are pulsars their beams do not intersect Earth and so remain invisible. Undetectable at the time of this pulsar’s discovery was a much slower, second pulsar signal. If this was indeed a double pulsar, it would provide a unique test bed for the most stringent test ever of Einstein’s theory of gravity, general relativity.


Neutron Star Gravitational Wave Double Pulsar Companion Star Millisecond Pulsar 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    We will look at the details of this extraordinary survey in the next chapter.Google Scholar
  2. 2.
    The direction the axis of an orbit or rotation points swivels around in a specific and predictable fashion, a phenomenon known as precession.Google Scholar

Copyright information

© Praxis Publishing Ltd. 2008

Personalised recommendations