**Previous
abstract** **Next
abstract**

**Session 87 - Large Scale Structure.**

*Display session, Friday, January 09*

*Exhibit Hall, *

## [87.13] 1-D Velocity Surveys as a Probe of Large Scale Structure

*H. Feldman (U. Kansas), R. Watkins (Dartmouth College)*
We propose a new strategy to probe the power spectrum on
large scales using galaxy peculiar velocities. We explore
the properties of surveys that cover only two small fields
in opposing directions on the sky. Surveys of this type
have several advantages over those that attempt to cover the
entire sky; in particular, by concentrating galaxies in
narrow cones these surveys are able to achieve the density
needed to measure several moments of the velocity field with
only a modest number of objects, even for surveys designed
to probe scales \gtrsim 100h^-1 Mpc. We construct mock
surveys with this geometry and analyze them in terms of the
three moments to which they are most sensitive. We
calculate window functions for these moments and construct a
\chi^2 statistic which can be used to put constraints on
the power spectrum. In order to explore the sensitivity of
these surveys, we calculate the expectation values of the
moments and their associated measurement noise as a function
of the survey parameters such as density and depth and for
several popular models of structure formation. In addition,
we have studied how well surveys of this type can
distinguish between different power spectra and found that
cone surveys are as good or better than full-sky surveys in
distinguishing between popular cosmological models. We find
that a survey with 200-300 galaxy peculiar velocities with
distance errors of 15% in two cones with opening angle of
\sim 10^\circ could put significant constraints on the
power spectrum on scales of 100-300h^-1 Mpc, where few other
constraints exist. We believe that surveys of this type
could provide a valuable tool for the study of large scale
structure on these scales and present a viable alternative
to full sky surveys.

**Program
listing for Friday**