Theoretical expectations for bulk flows in large scale surveys

Dec 21, 1993
13 pages
Published in:
  • Astrophys.J.Lett. 430 (1994) L17
e-Print:
Report number:
  • UM-AC-93-22

Citations per year

199420012008201520220246810
Abstract: (arXiv)
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 9094%90-94\% confidence level.