By J. E. Baldwin (auth.), David L. Jauncey (eds.)

337 F(e) = (z) the place the perspective among the instructions III and 112 is the same as eight. r is the angular diameter powerful distance of the epoch for recombination. F (8) ~ve have F(e) : f (e) ~ (S" ) e. . ~ is a Bessel functionality. it truly is assumed right here that the spectrum of gravitational waves takes the shape 1\ hI'::: hoK for all appropriate wavelengths, a is beam width of the radio antenna, d\= d~, and ~ is the length of the method of recombinations in \-time. the consequences for various beam widths are proven in Fig. 1. 338 I. D. NOVIKOV 1-. . . -__ zero. five 1 1. five 2 e' zero. five o and for a l' (solid line) and Fig. 1. The functionality f(8) for n for a = 2' (dotted line). those formulation may be utilized in analysing the results of destiny observations. comparability with the observational info now to be had permits us to set up an higher restrict for the power density of lengthy gravitational waves. this system is so much delicate for gravitational waves with A ~ ct The fluctuations ~; because of those waves have scale ~ zero. 03 GW rec four radian. If, in response to sleek observations, we take ~; < 10- , then eight 26 ~GW/Ey < 10- for these gravitational waves that have A = five. 10 cm GW at the present time the place Ey is the strength density of relict radiation. The fluctuations ~TT because of lengthy gravitational waves with A = ct .

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E. GA. GB and GB2. 45 sr) from which the data were collected in a given flux density range. since each of the surveys contains a sufficiently large number of sources. or to amalgamate them simply in order to obtain an improved source count. since the surveys are statistically independent. The source counts 'mentioned above or any combination of them can be extended toward a high flux density region. using the improved data which have been assembled by Bridle et al. (1972), Bridle and Fomalont (1974) and Fomalont et al.

1973, Aust. J. Phys. 26, 403. , 1976, Mon. Not. Roy. Astron. Soc. 175, 61. , 1976, Mon. Not. Roy. Astron. Soc. 175, 71. DISCUSSION Jauncey: survey? Lari: Have you really detected Abell clustering in the Bologna Yes. We have covered enough Abell clusters to overcome the background fluctuations, and we find a very peaked distribution near the centres of the clusters. More exactly, we have added together all distance 5 Abell clusters and we find a total number of 96 B2 sources within one Abell radius.

1970, 1972, 1973) does not represent a particularly new achievement since the first records refer to 1968. We will summarize here the main properties for a statistical use of the survey, the differential counts and the isotropy characteristic of this flux level, the latter being completely new. 5 steradians in the northern sky. The survey was projected to furnish a wide sample (9475 sources) with good positions and fluxes and we11defined completeness down to faint levels for statistical studies.

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