Evolution of the Tully-Fisher Relation

Fernández Lorenzo, M.; Cepa, J.; Bongiovanni, A.; Castañeda, H.; Pérez García, A. M.; López, M. A. Lara; Pović, M.; Sánchez Portal, M.
Bibliographical reference

Highlights of Spanish Astrophysics V, Astrophysics and Space Science Proceedings. ISBN 978-3-642-11249-2. Springer-Verlag Berlin Heidelberg, 2010, p. 291

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2010
Number of authors
8
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0
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0
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0
Description
The study of the evolution of the Tully-Fisher relation has raised some problems during the last years. The main difficulty is determining the required parameters of intermediate redshift galaxies. In the present work, the rotational velocities obtained from the widths of different optical lines using DEEP2 spectra are compared. The apparent magnitudes are K and extinction corrected, and the absolute magnitudes are derived using the concordance cosmological model. Finally the B, R, and I-band Tully-Fisher relation up to z = 1. 3 is derived. Although most studies (this included) find evidences for evolution, the results are not conclusive enough, given that the possible luminosity evolution is within the scattering of the relation and the evolution in slope is difficult to determine because at high redshift only the brightest galaxies can be measured. Nevertheless, this study shows a clear tendency, that is the same for all bands, favouring a luminosity evolution where galaxies were brighter in the past for a fixed rotation velocity.