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Astron. Astrophys. 348, 667-672 (1999)

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Non-local bias and the problem of large-scale power in the Standard Cold Dark Matter model

A. Del Popolo 1,2, Y. Takahashi 3, H. Kiuchi 3 and M. Gambera 1,4

1 Istituto di Astronomia dell'Università di Catania, Viale A. Doria 6, I-95125 Catania, Italy
2 Dipartimento di Matematica, Università Statale di Bergamo, Piazza Rosate 2, I-24129 Bergamo, Italy
3 Communications Reasearch Laboratory, 4-2-1 Nukui-kita, Koganei, Tokyo 184-8795, Japan
4 Osservatorio Astrofisico di Catania and CNR-GNA, Viale A. Doria 6, I-95125 Catania, Italy

Received 4 January 1999 / Accepted 25 May 1999


We study the effect of non-radial motions, originating from the gravitational interaction of the quadrupole moment of a protogalaxy with the tidal field of the matter of the neighboring protostructures, on the angular correlation function of galaxies. We calculate the angular correlation function using a Standard Cold Dark Matter (hereafter SCDM) model ([FORMULA], h=0.5, [FORMULA]) and we compare it with the angular correlation function of the APM galaxy survey (Maddox et al. 1990; Maddox et al. 1996). We find that taking account of non-radial motions in the calculation of the angular correlation function gives a better agreement of the theoretical prediction of the SCDM model to the observed estimates of large-scale power in the galaxy distribution.

Key words: cosmology: theory – cosmology: large-scale structure of Universe – galaxies: formation

Send offprint requests to: A. Del Popolo (antonino@astrct.ct.astro.it); M. Gambera (mga@sunct.ct.astro.it)

© European Southern Observatory (ESO) 1999

Online publication: August 13, 199