The bulk motion of flat edge-on galaxies based on 2MASS photometry

¹ Astronomical Observatory of Kiev Taras Shevchenko National University, Observatorna str., 3, 04053 Kiev, Ukraine
² Special Astrophysical Observatory, Russian Academy of Sciences, N.Arkhyz, KChR, 369167, Russia
³ Isaac Newton Institute of Chile, SAO Branch, Russia
⁴ Infrared Processing and Analysis Center, Mail Stop 100-22, California Institute of Technology, Jet Propulsion Laboratory, Pasadena, CA 91125
⁵ Max-Planck – Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany

Corresponding author: S. N. Mitronova, mit@luna.sao.ru

Received: 11 February 2003
Accepted: 12 May 2003

Abstract

We report the results of applying the 2MASS Tully-Fisher (TF) relations to study galaxy bulk flows. For 1141 all-sky distributed flat RFGC galaxies we construct TF relations and find that Kron J_fe magnitudes show the smallest dispersion on the TF diagram. For the sample of 971 RFGC galaxies with  km s^-1 we find a dispersion and an amplitude of bulk flow  km s^-1, directed towards . Our determination of low-amplitude coherent flow is in good agreement with a set of recent data derived from EFAR, PSCz and SCI/SCII samples. The resultant two-dimensional smoothed peculiar velocity field traces well the large-scale density variations in the galaxy distributions. The regions of large positive peculiar velocities lie in the direction of the Great Attractor and Shapley concentration. A significant negative peculiar velocity is seen in the direction of Bootes and in the direction of the Local void. A small positive peculiar velocity (100–150 km s^-1) is seen towards the Pisces-Perseus supercluster, as well as the Hercules – Coma – Corona Borealis supercluster regions.