Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1845n&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 96, Dec. 1988, p. 1845-1849. Research supported by the Ministere de l'Education du Q
Astronomy and Astrophysics
Astronomy
10
Cosmology, Galactic Clusters, H I Regions, Very Large Array (Vla), Astronomical Spectroscopy, Emission Spectra, Hubble Constant, Quasars, Red Shift
Scientific paper
The authors have used the NRAO Very Large Array in the D configuration in spectral mode to look for the λ 21 cm line redshifted to 90 cm (z ≡ 3.3) from collapsing protoclusters and protosuperclusters of galaxies, as first suggested by Sunyaev and Zel'dovich. As in their 1986 run, reported in Hardy and Noreau (1987), the authors used QSOs as probes for matter. Three fields centered at moderately high galactic latitudes were surveyed in April 1987. They all contain two or more quasars near z ≡ 3.3 separated by a comoving distance compatible with the size of a supercluster. No line emission was detected. The authors present the observations, the data-processing analysis, and conclusions on the implication of their null result.
Hardy Eduardo
Noreau Louis
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