Deconstructing the Antlia cluster core^⋆

¹ Grupo de Investigación CGGE, Facultad de Ciencias Astronómicas y Geofísicas de la Universidad Nacional de La Plata, and Instituto de Astrofísica de La Plata (CCT La Plata – CONICET, UNLP), Paseo del Bosque S/N, B1900, FWA La Plata, Argentina
² Consejo Nacional de Investigaciones Científicas y Técnicas, Rivadavia 1917, C1033 AAJ Ciudad Autónoma de Buenos Aires, Argentina
³ Departamento de Astronomía, Universidad de Concepción, Casilla 160-C Concepción, Chile

Received: 7 August 2015
Accepted: 23 September 2015

Abstract

Context. The present literature does not give a satisfactory answer to the question about the nature of the “Antlia galaxy cluster”.

Aims. The radial velocities of galaxies found in the region around the giant ellipticals NGC 3258/3268 range from about 1000 km s^-1 to 4000 km s^-1. We characterise this region and its possible kinematical and population substructure.

Methods. We have obtained VLT–VIMOS multi-object spectra of the galaxy population in the inner part of the Antlia cluster and measure radial velocities for 45 potential members. We supplement our galaxy sample with literature data, ending up with 105 galaxy velocities.

Results. We find a large radial velocity dispersion for the entire sample as reported in previous papers. However, we find three groups at about 1900 km s^-1, 2800 km s^-1, and 3700 km s^-1, which we interpret as differences in the recession velocities rather than peculiar velocities.

Conclusions. The high radial velocity dispersion of galaxies in the Antlia region reflects a considerable extension along the line of sight.