Astronomy and Astrophysics – Astronomy
Scientific paper
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.
Backer Donald C.
Davis Martin
Goss William Miller
Heiles Carl
Kulkarni Sanjeev R.
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