Age-dating the Tully-Fisher relation at moderate redshift

作者：Ferreras Ignacio^*; Boehm Asmus; Ziegler Bodo; Silk Joseph

来源：Monthly Notices of the Royal Astronomical Society, 2014, 437(2): 1872-1881.

DOI：10.1093/mnras/stt2018

• galaxies: evolution
• galaxies: formation
• galaxies: fundamental parameters
• galaxies: stellar content

We analyse the Tully-Fisher relation at moderate redshift from the point of view of the underlying stellar populations, by comparing optical and NIR photometry with a phenomenological model that combines population synthesis with a simple prescription for chemical enrichment. The sample comprises 108 late-type galaxies extracted from the FORS Deep Field and William Herschel Deep Field surveys at z less than or similar to 1 (median redshift z = 0.45). A correlation is found between stellar mass and the parameters that describe the star formation history, with massive galaxies forming their populations early (z(FOR) similar to 3), with star formation timescales, tau(1) similar to 4 Gyr, although with very efficient chemical enrichment time-scales (tau(2) similar to 1Gyr). In contrast, the stellar-to-dynamical mass ratio - which, in principle, would track the efficiency of feedback in the baryonic processes driving galaxy formation - does not appear to correlate with the model parameters. On the Tully-Fisher plane, no significant age segregation is found at fixed circular speed, whereas at fixed stellar-to-dynamical mass fraction, age splits the sample, with older galaxies having faster circular speeds at fixed M-s/M-dyn. Although our model does not introduce any prior constraint on dust reddening, we obtain a strong correlation between colour excess and stellar mass.

• 出版日期2014-1