Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.5606r&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #56.06; Bulletin of the American Astronomical Society, Vol. 26, p.1407
Astronomy and Astrophysics
Astronomy
Scientific paper
The transformation from real space to redshift space is nonlinear; thus, maps in redshift space become increasingly distorted as the redshift z increases. If the deceleration parameter q_0 is greater than -1, then voids in the distribution of galaxies will be distorted along the line of sight in redshift space. Accurate measurement of the volume and axis ratio of voids, as a function of redshift, will provide an estimate of q_0. To test this method of measuring q_0, I created a two-dimensional universe free of peculiar velocities, in which galaxies are located near the walls of a Voronoi foam. The area and axis ratios of voids were measured using an algorithm which fits ellipses within voids. In my toy universe, distinguishing between a q_0 = -1 universe and a q_0 = 1/2 universe requires a survey which goes to a depth of z ~ 0.1 in redshift. Peculiar velocities, however, will create an additional source of uncertainty for the values of q_0 measured by this method in n-body simulations and in the real universe.
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