Large--Scale Angular Correlations in CDM Models

Details Large--Scale Angular Correlations in CDM Models Large--Scale Angular Correlations in CDM Models

1993-02-23

arxiv.org/abs/astro-ph/9302012v1

Astrophys.J. 413 (1993) L55-L58

Astronomy and Astrophysics

Astrophysics

12 pages plus 2 figures available upon request by e-mail as post-script files or by ordinary mail. To be compiled with LaTeX,

Scientific paper

10.1086/186958

We generate artificial Lick maps using $N$--body simulations and compare the angular correlation function, $w(\vartheta)$, measured from the simulations with the APM correlation. For the Gaussian CDM model, neither the standard biassed model nor a more evolved model (as suggested by the COBE data), reproduce the correlations on large angular scales. We come to a similar conclusion about CDM models with positively skewed initial fluctuation distributions. In contrast, models with initially negatively skewed fluctuations produce a $w(\vartheta)$ that declines much more gently on large scales. Such models are therefore in principle capable of reconciling the lack of large--scale power of the CDM spectrum with the observed clustering of APM galaxies.

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