A new look at pulsar statistics - Birthrate and evidence for injection

Details A new look at pulsar statistics - Birthrate and evidence for injection A new look at pulsar statistics - Birthrate and evidence for injection

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981japa....2..315v&link_type=abstract

Journal of Astrophysics and Astronomy, vol. 2, Sept. 1981, p. 315-337.

Astronomy and Astrophysics

Astrophysics

102

Pulsars, Statistical Analysis, Stellar Evolution, Stellar Models, Binary Stars, Stellar Envelopes, Stellar Luminosity, Stellar Magnitude

Scientific paper

A new approach for calculating pulsar birthrate is presented, using the concept of pulsar current in the P-P diagram, recently proposed by Phinney and Blandford (1981) and Naroyan and Vivekanand (1981). Using the available sample of P and P values, the current of pulsars, J(p), flowing undirectionally along the P-axis is estimated; J(p) is found from the pulsar data, independently of any pulsar evolution model. The number of pulsars in the galaxy is found to be 605,000, and the birthrate is computed to be 0.048 pulsars/year-galaxy. This mean pulsar birthrate (one pulsar every 21 years) is in close agreement with current estimates of supernova explosions (one pulsar every 30 years). It is also concluded that many pulsars first appear at periods greater than 0.5 sec. Finally, an average value for the braking index, n, is computed: n = 3.7 + or - 0.8. This result, which is not consistent with the dipole model for pulsar breaking (n = 3), places earlier studies on pulsar evolution in question.

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