Volume 403, Number 2, May IV 2003
|Page(s)||529 - 536|
|Published online||06 May 2003|
Structure and mass distribution of spiral galaxies at intermediate redshifts
Institute of Theoretical Physics, Tartu University, Tähe 4, Tartu 51010, Estonia e-mail: firstname.lastname@example.org
2 Tartu Observatory, Tõravere, Tartumaa 61602, Estonia
Corresponding author: P. Tenjes, email@example.com
Accepted: 25 February 2003
Using the HST archive WFPC2 observations and rotation curves measured by Vogt et al. ([CITE]), we constructed self-consistent light and mass distribution models for three disk galaxies at redshifts and 0.99. The models consist of three components: the bulge, the disk and the dark matter. The light distribution of the galaxies in the outer parts is steeper than a simple exponential disk. Spatial density distribution parameters for the components were calculated. After applying k-corrections, mass-to-light ratios for galactic disks within the maximum disk assumption are , 1.2 and 1.2, respectively. Corresponding central densities of dark matter halos within a truncated isothermal model are 0.0092, 0.028 and 0.015 in units . In addition, we constructed mass distribution models without a dark matter component. Due to the limited extent of rotational curves the models without a dark halo fit equally well with observations. In this case mass-to-light ratios for galactic disks are 5.5, 3.3 and 2.1, respectively.
Key words: galaxies: photometry / galaxies: fundamental parameters / galaxies: high redshift / galaxies: spiral / galaxies: structure / dark matter
© ESO, 2003
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