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Statistics of Galaxy Orientations: Morphology and the Large Scale Structure

Published online by Cambridge University Press:  03 August 2017

D. G. Lambas
Affiliation:
Joseph Henry Labs., Princeton University, Princeton, N.J. 08544 U.S.A.
E. J. Groth
Affiliation:
Joseph Henry Labs., Princeton University, Princeton, N.J. 08544 U.S.A.
P. J. E. Peebles
Affiliation:
Joseph Henry Labs., Princeton University, Princeton, N.J. 08544 U.S.A.

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Using the Uppsala General Catalog of bright galaxies (Nilson, 1973) and the northern and southern galaxy maps (Seldner, et al., 1977) made from the Lick counts (Shane and Wirtanen, 1967), we find statistical evidence of a morphology-orientation effect. Our results indicate that elliptical galaxies are preferentially oriented along the large scale features of the Lick maps. However, position angles of spiral and SO galaxies show no clear signs of non-random behavior. The angular scale of the detected alignment effect for ellipticals is θ ∼ 2 to 4°, which at a redshift of Z ∼ .03 (which comprises the depths of both catalogs) corresponds to a linear scale of ∼ 3 to 6 h−1 Mpc.

Type
Appendix 1: Poster Papers
Copyright
Copyright © Reidel 1988