Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395..339b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 395, no. 2, Aug. 20, 1992, p. 339-346.
Astronomy and Astrophysics
Astrophysics
13
Astronomical Catalogs, Fine Structure, Galactic Clusters, Method Of Moments, Error Analysis, Poisson Density Functions
Scientific paper
We estimate the three-point correlation function for samples of galaxy clusters identified from the Lick galaxy catalog at different density thresholds in order to test the ability of the biasing prescription to account for the different correlation properties of different hierarchy cosmic structures. We use two methods: the moment method and the direct counting of triplets. We find that the two methods give consistent estimates of the Q-values, while the associated uncertainties are rather different. In particular, larger errors are always obtained from the moment method. For clusters identified at the higher threshold levels of the underlying galaxy field we obtain Q about 0.5-0.8. A general trend is found for the Q-values to take smaller values as the height of the threshold decreases. This agrees with the expectation of biasing models, where non-Gaussianity arises as a threshold effect.
Borgani Stefano
Jing Yipeng
Plionis Manolis
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