KLUN+ peculiar velocity survey

M. Hanski (1)

1 LPCE - Laboratoire de physique et chimie de l'environnement

The enhanced Kinematics of the Local Universe (KLUN+) galaxy sample is a collection of galaxies suitable for Tully-Fisher (TF)or Faber-Jackson (FJ) distance estimation. Here we extract a subsampleof 6229 KLUN+ galaxies closer than 80 Mpc/h, and calculate theirdistances and peculiar velocities with the Iterative Normalized Distance method. Within this method we can derive an analytical formula,independent from the density inhomogeneities, for correcting the selection biases. The radial peculiar velocities can then be derivedfrom the redshifts and the corrected distances.The velocities are smoothed,and the smoothed velocity field is used as a correction term at the nextderivation of normalized distances. This iterative procedure is repeateduntil converging values are reached.Here we present the resulting map of the radial peculiar velocity field at the < 80 Mpc/h environment. The infall patterns towards the maingalaxy clusters are clearly visible.The color version of the map, other figures,and animations are provided on the project web site.

Mots clés: cosmology; large-scale structure

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]

M. Hanski. KLUN+ peculiar velocity survey. 2003. ⟨hal-00000658⟩