Distance to the 1.5 millisecond pulsar and other 4C 21.53 objects

Details Distance to the 1.5 millisecond pulsar and other 4C 21.53 objects Distance to the 1.5 millisecond pulsar and other 4C 21.53 objects

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273l..75h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 273, Oct. 15, 1983, p. L75-L79.

Astronomy and Astrophysics

Astronomy

27

Astrometry, Interstellar Extinction, Pulsars, Radio Sources (Astronomy), Absorption Spectroscopy, Distance, H Ii Regions, Phase Switching Interferometers

Scientific paper

The distance to the 1.5 millisecond pulsar is estimated as 5 kpc based on neutral hydrogen absorption measurements. Two nearby sources, which along with the pulsar constitute the 4C 21.53 complex of radio sources, are shown to be more distant than the pulsar. In particular, 4C 21.53 W, the H II region adjacent to the pulsar is about 10.7 kpc distant and clearly unrelated. The pulsar H I absorption measurement required development of a new observing technique which is described in detail.

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