Bibcode
Fernández-Lorenzo, M.; Cepa, J.; Bongiovanni, A.; Pérez-García, A. M.; Lara-López, M. A.; Pović, M.; Sánchez-Portal, M.
Bibliographical reference
Astronomy and Astrophysics, Volume 521, id.A27
Advertised on:
10
2010
Journal
Citations
16
Refereed citations
16
Description
Context. The Tully-Fisher relation represents a connection between
fundamental galaxy parameters, such as its total mass and the mass
locked in stars. Therefore, the study of the evolution of this relation
in the optical and infrared bands can provide valuable information about
the evolution of the individual galaxies through the changes found in
each band. Aims: This work aims to study the Tully-Fisher
relation at high redshift in the B, V, R, I, and KS-bands by
comparison with the local relations derived from a large sample of
galaxies in the redshift range 0.1 < z < 0.3, processed in the
same way, and with the same instrumental constraints that the
high-redshift sample. Methods: Using the large amount of
photometric information available in the AEGIS database, we determined
the optimal procedure for obtaining reliable k-corrections. Instrumental
magnitudes were then k- and extinction corrected and the absolute
magnitudes derived, using the concordance cosmological model. The
rotational velocities were inferred from the widths of optical lines in
DEEP2 spectra. At high redshift, this method is found to provide more
accurate results than using the rotation curve, because of spatial
resolution limitations. Morphology was determined by visual
classification of the HST images. From the above information, the
Tully-Fisher relations in B, V, R, I, and KS-bands are
derived for the local and high-redshift sample. Results: We
detect evolution in the B, V, and R-bands in the sense that galaxies
were brighter in the past at the same rotation velocity. The change in
luminosity is more noticeable in the bluer bands. This colour evolution,
unnoticed in our previous work, is detected thanks to the more reliable
k-corrections carried out in this paper, which included photometry from
B to IRAC bands. The change in the (V-KS) and (R-I) colours
(for a fixed velocity) could be interpreted as an ageing of the stellar
populations as consequence of the star formation decrease since z =
1.25. In addition, we conclude that spiral galaxies may have doubled
their stellar masses in the past 8.6 Gyr.