EDP Sciences
Free access
Volume 407, Number 3, September I 2003
Page(s) 889 - 898
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20030857

A&A 407, 889-898 (2003)
DOI: 10.1051/0004-6361:20030857

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

Yu. N. Kudrya1, V. E. Karachentseva1, I. D. Karachentsev2, S. N. Mitronova2, 3, T. H. Jarrett4 and W. K. Huchtmeier5

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

(Received 11 February 2003/ 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 $J, H,
K_{\rm s}$ TF relations and find that Kron $J_{\rm fe}$ magnitudes show the smallest dispersion on the TF diagram. For the sample of 971 RFGC galaxies with $V_{\rm 3K} < 18\,000$ km s -1 we find a dispersion $\sigma_{\rm TF}=0.42\rm ^m$ and an amplitude of bulk flow $V= 199\pm61$ km s -1, directed towards $l=301\degr\pm18\degr,
b=-2\degr\pm15\degr$ . 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

Offprint request: S. N. Mitronova, mit@luna.sao.ru

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