Pulsar birthrate set by cosmic-ray positron observations

Details Pulsar birthrate set by cosmic-ray positron observations Pulsar birthrate set by cosmic-ray positron observations

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...418..649g&link_type=abstract

Astronomy and Astrophysics, v.418, p.649-653 (2004)

Astronomy and Astrophysics

Astrophysics

13

Stars: Pulsar: General, Ism: Cosmic-Rays

Scientific paper

The pulsar birthrate (PB) in our galaxy is a parameter known with a large uncertainty. Different estimates indicate that 1/PB ranges between 30 and 250 years. Assuming a polar-cap model for gamma-ray production in gamma-ray pulsars, positron fraction measurements in cosmic rays above a few GeV make it possible to set a limit on PB.
Recent measurements of the e+/(e+ +e-) ratio indicate a PB of one pulsar born every 200±100 years when the uncertainty on the secondary positron calculations is taken into account. A PB compatible with this result is found even in the case of a relevant production of positrons in the pulsar outer gaps.

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