IAU01686
Presentation type requested: POSTER
PECULIAR VELOCITIES OF GALAXIES BEYOND THE LOCAL VOID
Ikuru Iwata
Department of astronomy, Kyoto Univ.
The Local void is the nearest void from us and is thought to be playing an important role in the kinematics of the local universe, especially as one of the suspected source of the motion of the Local group. The unbalance of mass between the Local void region and the concentration at the opposite side might be the origin of the velocity of the Local group perpendicular to the Supergalactic plane, and this would be a proto-type of the evolution of the large-scale structure. The proximity of the Local void provides us the exclusive opportunity to investigate the kinematics around a void. Here we report results of our observational study of the peculiar velocities of about 50 galaxies at the far-side of the Local void, using the near-infrared Tully-Fisher relation. The galaxies at the boundary of the void shows an excess of receding motion, suggesting the expansion of the Local void.
Nakanishi Kouichiro , Roman Adel T, Chamaraux Pierre , Ohta Kouji
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