New limits on the population of millisecond pulsars in the galactic plane

Details New limits on the population of millisecond pulsars in the galactic plane New limits on the population of millisecond pulsars in the galactic plane

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..277j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Sept. 15, 1991, p. 277-281.

Astronomy and Astrophysics

Astronomy

44

Milky Way Galaxy, Pulsars, Stellar Luminosity, X Ray Binaries, Monte Carlo Method, Sky Surveys (Astronomy), Stellar Mass

Scientific paper

This paper investigates the disk population of millisecnd pulsars using the results of the recent high-frequency survey of the southern galactic plane by Johnston et al. (1991) and the corresponding earlier survey of the northern galactic plane by Clifton and Lyne. It is shown that the number of millisecond pulsars in the Galaxy with luminosities similar to PSR 1937 + 21 and PSR 1855 + 0.9 need not exceed about 60 and about 2500, respectively. These limits are much lower than previous estimates, partly because of an improved distance estimate to 1855 + 0.9. If all millisecond pulsars have similar luminosities to that of 1855 + 0.9, then it is possible that all millisecond pulsars evolve from low-mass X-ray binaries. However, only poor constraints can be placed on the populations of very steep spectrum objects like PSR 1957 + 20, and intrinsically low-luminosity pulsars such as PSR 1257 + 12, which could be of order 100,000 in number. An LF survey of the Southern Hemisphere for millisecond pulsars now under way should be able to place strong limits on the galactic population and their birthrates.

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