Age-dating the Tully-Fisher relation at moderate redshift
Abstract
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 ≲ 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 (zFOR ∼ 3), with star formation time-scales, τ1 ∼ 4 Gyr, although with very efficient chemical enrichment time-scales (τ2 ∼ 1 Gyr). 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 Ms/Mdyn. Although our model does not introduce any prior constraint on dust reddening, we obtain a strong correlation between colour excess and stellar mass.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- January 2014
- DOI:
- 10.1093/mnras/stt2018
- arXiv:
- arXiv:1304.2770
- Bibcode:
- 2014MNRAS.437.1872F
- Keywords:
-
- galaxies: evolution;
- galaxies: formation;
- galaxies: fundamental parameters;
- galaxies: stellar content;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 10 pages, 11 figures, accepted for publication in MNRAS