VLBI parallaxes of important Southern Hemisphere pulsars

Details VLBI parallaxes of important Southern Hemisphere pulsars VLBI parallaxes of important Southern Hemisphere pulsars

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006atnf.prop..244d&link_type=abstract

ATNF proposal V190, Semester: April, 2006

Astronomy and Astrophysics

Astrophysics

Stellar, Galactic, Lba

Scientific paper

Although some attributes of pulsars are known to outstanding precision, their distances rely on galactic electron models and are usually only reliable to ~30%. The distance models are constructed from pulsar neutral hydrogen absorption measurements, rare parallax estimates, and the pulsar dispersion measure (DM), a measure of the integrated column density of free electrons along the line of sight to the pulsar. In the south, where the bulk of pulsars reside, our knowledge of the interstellar medium (ISM) is relatively poor. Comparison of the two reliable VLBI parallaxes in the south to DM measurements shows that the density of the ionised component of the ISM varies by an order of magnitude. We propose to use the high sensitivity offered by the LBA's new disk-based recorder and software correlator system to determine parallax distances to some southern pulsars of high scientific interest, including the double pulsar J0737-3039A/B. This will greatly expand the number of known pulsar parallaxes at southern Galactic latitudes and deliver some crucial science outcomes in a range of areas, from the radio pulsar population, to Galactic electron models, X-ray pulsar emission physics, and the emerging area of gravitational wave astrophysics.

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