Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.218..577b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 218, Feb. 1, 1986, p. 577-585.
Astronomy and Astrophysics
Astronomy
22
Centimeter Waves, Cosmic Gases, Cosmology, Galactic Clusters, Radio Astronomy, Continuous Spectra, Line Spectra, Radiant Flux Density, Red Shift, Synthetic Apertures, Universe
Scientific paper
According to the pancake theory of formation of large-scale structure in the Universe, gaseous pancakes are expected to form in the range of redshifts 5 - 10. One of the ways in which they should manifest their presence is through emission in the 21-cm line by their neutral hydrogen component. An aperture synthesis radio telescope has been used at 151 MHz to map the sky north of declination 82°. Data sampling was arranged to permit a differential mapping technique to be used, which enabled the continuum emission in the field to be almost entirely cancelled, to leave a residual rms level of 5 mJy. At the 2σ level, no sources were found in a 1 per cent redshift range around z = 8.4, the nominal survey redshift. The observations are found to provide new limits on the pancake population under certain Friedmann cosmologies.
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