A&A 433, 31-41 (2005)
Structure of visible and dark matter components in spiral galaxies at redshifts zA. Tamm1 and P. Tenjes1, 2
1 Institute of Theoretical Physics, Tartu University, Tähe 4, Tartu 51010, Estonia
2 Tartu Observatory, Tõravere, Tartumaa 61602, Estonia
(Received 23 August 2004 / Accepted 29 November 2004)
We have constructed self-consistent light and mass distribution models for four disk galaxies at redshifts z=0.48, 0.58, 0.81 and 0.88, using the HST archive WFPC2 observations (HDF-S, MDS, Groth Strip survey) and rotation curves measured by Vogt et al. (1996) and Rigopoulou et al. (2002). The models consist of three components: a bulge, a disk and a dark matter halo. Similarly to the sample studied in Paper I (Tamm & Tenjes 2003), light distribution of the galaxies in the outer parts is clearly steeper than a simple exponential disk. After applying k-corrections, calculated mass-to-light ratios for galactic disks within the maximum disk assumption are M/LB = 0.9, 7.4, 4.3 and 1.4, respectively. Together with the galaxies from Paper I, the mean 2.5 at , indicating no significant evolution of M/LB with redshift. Central densities of dark matter halos for an isothermal model are 0.008, 0.035, 0.013, and 0.022 in units respectively. Together with the galaxies from Paper I, the DM central density of the four galaxies at mean readshift is also showing no significant evolution with redshift.
Key words: galaxies: photometry -- galaxies: fundamental parameters -- galaxies: high-redshift -- galaxies: spiral -- galaxies: structure -- dark matter
© ESO 2005