Investigation of the galaxy peculiar velocity field caused by single attractor in quadrupole and octupole approximations

Parnovsky, SL, Tugay, AV
Kinemat. fiz. nebesnyh tel (Online) 2004, 20(3):260-268
Language: Russian
Abstract: 

We made a simulation of the galaxy peculiar motion field caused by one attractor for a real sample of galaxies and analysed it in the quadrupole and octopole approximations. The orientation of one of the quadrupole tensor axes can be an indicator of the attractor position on the celestial sphere if the attractor is sufficiently distant, but the angle of the axis deviation from the direction towards the attractor is approximately six times greater than the corresponding angle for bulk motion (vector of the dipole component). The octopole component gives us no information on the attractor position. We show that a four-attract or model of density distribution is not adequate in the quadrupole approximation.

Keywords: galaxies