Is the universe a fractal? Tests on quasar samples

Details Is the universe a fractal? Tests on quasar samples Is the universe a fractal? Tests on quasar samples

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..527a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Dec. 1, 1991, p. 527-532.

Astronomy and Astrophysics

Astronomy

9

Fractals, Galactic Clusters, Quasars, Red Shift, Astronomical Catalogs, Universe

Scientific paper

Several complete samples of quasars (450 objects in total) are used to gain information on the large-scale structure of the universe at redshifts in the range of 0.4 and 2.2. The conditional density and the average density functions are evaluated to establish that on scales larger than 12.5/h Mpc the quasar distribution becomes homogeneous. The use of a more conventional and time-honored technique such as the correlation function is therefore appropriate in the case of the present samples and equivalent to the conditional and average density functions. These latter functions make it possible to put slightly stronger constraints on the amplitude of clustering at large scales. Possible observational biases which could lead to incorrect conclusions on quasar clustering are discussed.

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