Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...69..439h&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 69, no. 3, June 1987, p. 439-443.
Astronomy and Astrophysics
Astrophysics
8
Galactic Clusters, Galactic Evolution, Hydrogen Clouds, Mass Distribution, Neutral Gases, Voids, Cosmology, Telescopes
Scientific paper
A search for H I was conducted in some nearby voids using the Dwingeloo radio telescope. It appears that a sufficient part of the frequency band is free from radar interference to allow such studies, especially of the Perseus void. A search covering a small fraction of this void was sensitive (at the 10-sigma level) to about 3 x 10 to the 10th/h sq solar mass. No signals at this level were found except for a possible but very weak one in the direction of UGC 749. It is concluded that the Dwingeloo telescope is sufficiently stable and sensitive to detect any cosmologically significant amount of H I in the Perseus void. The lack of positive detections indicates that discrete clouds more massive than a few times 10 to the 10th/h sq solar mass do not contribute more than 0.0007 x (h)rho(crit) to the density.
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