Theoretical Expectations for Bulk Flows in Large Scale Surveys

Details Theoretical Expectations for Bulk Flows in Large Scale Surveys Theoretical Expectations for Bulk Flows in Large Scale Surveys

1993-12-16

arxiv.org/abs/astro-ph/9312038v1

Astronomy and Astrophysics

Astrophysics

13 pages, uuencoded compressed postscript file with two figures and a table enclosed, UM-AC-93-22

Scientific paper

10.1086/187427

We calculate the theoretical expectation for the bulk motion of a large scale survey of the type recently carried out by Lauer and Postman. Included are the effects of survey geometry, errors in the distance measurements, clustering properties of the sample, and different assumed power spectra. We consider the power spectrum calculated from the IRAS--QDOT survey, as well as spectra from hot $+$ cold and standard cold dark matter models. We find that sparse sampling and clustering can lead to an unexpectedly large bulk flow, even in a very deep survey. Our results suggest that the expected bulk motion is inconsistent with that reported by Lauer and Postman at the $90-94\%$ confidence level.

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