Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e..55t&link_type=abstract
Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech
Astronomy and Astrophysics
Astronomy
Scientific paper
A new sample of 1561 flat spiral galaxies from the RFGC catalogue with known radial velocities and HI linewidths was build. It was used to determine values and errors of the parameters of the generalized Tully-Fisher relation in the "linear diameter - HI linewidth" version and multipole models of collective motions of galaxies. Unified data array was built for spiral galaxies from RGFC and Mark III catalogues. Using the Tully-Fisher "luminosity - HI linewidth" relation we obtained estimations of the distances and the radial peculiar velocities of these galaxies. It was shown that the position of nearby overdensities or so called attractors, that lie inside the sample, cannot be determined with the use of the multipole model of collective motions of galaxies. The density distribution model on 200 Mpc scale with 4 attractors was considered and its agreement with observational data of large-scale galaxy motions was analyzed. It was shown that this model agrees with parameters of the dipole component of the collective motions and disagrees with parameters of the quadrupole and the octopole components.
Parnovsky S. L.
Tugay A. V.
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