Multiparametric infrared Tully-Fisher relation as a tool for mapping cosmic flows |
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| Authors: | O G Kashibadze |
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| Institution: | (1) Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachaevo-Cherkessia, Russia |
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| Abstract: | The peculiar velocity field for 907 galaxies with heliocentric radial velocities VH ≤ 3000 km/s is examined. The data are divided into three samples, organized according to the principles behind the method
for determining the distance to the galaxies: the luminosity of the tip of the red giant branch (TRGB), fluctuations in the
surface brightness, and the infrared Tully-Fisher relation for spiral galaxies viewed edge-on. The latter sample includes
410 galaxies. For determining the distance to the galaxies in this sample, additional regressors were introduced into the
Tully-Fisher relation, in particular the “color index” K-m21, which make it possible significantly to reduce the dispersion with respect to the regression curve. All three samples showed
good agreement in the peculiar velocity distribution. Based on each of these samples, as well as on the combined sample, detailed
maps of the field of peculiar velocities of the galaxies are constructed for VH ≤ 3000 km/s. An analysis shows that most of the observed features of this map can be explained by large-scale density variations
in the galactic distribution.
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Translated from Astrofizika, Vol. 51, No. 3, pp. 409–422 (August 2008). |
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| Keywords: | infrared Tully-Fisher relation cosmic flows |
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