Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-03-13
Astronomy and Astrophysics
Astrophysics
29 pages, LaTeX, 17 figures, revised version, submitted to A&A, a high resolution version can be found at http://www.astro.u
Scientific paper
10.1051/0004-6361:20020446
We calculate synthetic UBVRIJHKLM images, integrated spectra and colours for the disk galaxy formation models of Samland & Gerhard (2002), from redshift z=4 to z=0. Two models are considered, an accretion model based on LambdaCDM structure formation simulations, and a classical collapse model in a dark matter halo. Both models provide the star formation history and dynamics of the baryonic component within a three-dimensional chemo-dynamical description. To convert to spectra and colours, we use the latest, metallicity-calibrated spectral library of Westera et al. (2002), including internal absorption. As a first application, we compare the derived colours with Hubble Deep Field North bulge colours and find good agreement. With our model, we disentangle metallicity effects and absorption effects on the integrated colours, and find that absorption effects are dominant for redshift z < 1.5. Furthermore, we confirm the quality of m_K as a mass tracer, and find indications for a correlation between (J-K) and metallicity gradients.
Buser Roland
Gerhard Ortwin
Samland Markus
Westera Pieter
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