Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apjs...57..631k&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 57, March 1985, p. 631-642.
Astronomy and Astrophysics
Astronomy
5
Centimeter Waves, Radio Interferometers, Radio Sources (Astronomy), Absorption Spectra, Calibrating, Computer Techniques, Correlators, Microwave Antennas
Scientific paper
The technical aspects and the astronomical performance of a new 21-cm spectral line interferometer that is now operational at Arecibo Observatory are described. The effective gain of the interferometer is 1 K/Jy. The cross-power spectrum can be measured over 256 channels in each circular polarization. The interferometer has a fringe spacing of about 4 arsec at the 21-cm line of H I. At such high spatial resolution, almost all galactic H I emission is resolved, even in the galactic plane. For all these reasons, this interferometer is ideally suited for 21-cm absorption spectroscopy of galactic H I. As an example of the data, some interferometric and corresponding single-dish absorption spectra toward high-latitude, extragalactic radio sources with flux densities varying from 1 to 7 Jy are presented. Numerical estimates are made the extent to which single-dish absorption spectra suffer from variations in H I emission at high latitudes.
Dickey John M.
Heiles Carl
Kulkarni Sanjeev R.
Turner Kenneth C.
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