Volume 407, Number 3, September I 2003
|Page(s)||889 - 898|
|Published online||17 November 2003|
The bulk motion of flat edge-on galaxies based on 2MASS photometry
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, firstname.lastname@example.org
Accepted: 12 May 2003
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 Jfe 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.
Key words: galaxies: spiral / galaxies: fundamental parameters
© ESO, 2003
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