Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26r.188c&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
Scientific paper
We perform a statistical study of the distribution and dynamical properties of voids and galaxies around voids in mock galaxy catalogs and in the 2dFGRS. We analyze the galaxy density profiles as a function of distance to the void center and compare these with the profiles obtained for the mass around voids in numerical simulations. We detect a redshift space distortion in the void-galaxy cross correlation function consistent with an outflow motion of void shells and we are able to measure this outflow using peculiar velocities in the mock catalogues. We also compare outflow velocities to the non-linear theory model for the velocities surrounding an underdense region and find that our measurements are consistent with these predictions. We note that statistics of outflow velocities obtained using peculiar velocity data are strongly and systematically affected by distance measurement errors. We also measure the velocity dispersion of galaxies in void shells and find that galaxies move faster in the direction parallel to the void walls. Also, these results are in agreement with direct measurements from full 3D numerical simulations.
Ceccarelli Laura
Lambas Diego G.
Padilla Nelson D.
Valotto Carlos
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