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Modelling the relative velocities of isolated pairs of galaxies

Abstract : We study the comoving relative velocities, v12, of model isolated galaxy pairs at z=0.5. For this purpose, we use the predictions from the GALFORM semi-analytical model of galaxy formation and evolution based on a Lambda cold dark matter cosmology consistent with the results from WMAP7. In real space, we find that isolated pairs of galaxies are predicted to form an angle t with the line-of-sight that is uniformily distributed as expected if the Universe is homogeneous and isotropic. We also find that isolated pairs of galaxies separated by a comoving distance between 1 and 3 Mpc/h are predicted to have =0. For galaxies in this regime, the distribution of the angle t is predicted to change minimally from real to redshift space, with a change smaller than 5% in . However, the distances defining the comoving regime strongly depends on the applied isolation criteria.
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Contributor : Danielle Cristofol <>
Submitted on : Thursday, September 4, 2014 - 1:24:38 PM
Last modification on : Monday, December 7, 2020 - 1:12:02 PM

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  • HAL Id : in2p3-01060851, version 1
  • ARXIV : 1309.7905



V. Gonzalez-Perez, E. Jennings, M. -C. Cousinou, S. Escoffier, A. Tilquin, et al.. Modelling the relative velocities of isolated pairs of galaxies. SF2A 2013, Jun 2014, Montpellier, France. pp.347-350. ⟨in2p3-01060851⟩



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