Structure of visible and dark matter components in spiral galaxies at redshifts z = 0.5-0.9

Details Structure of visible and dark matter components in spiral galaxies at redshifts z = 0.5-0.9 Structure of visible and dark matter components in spiral galaxies at redshifts z = 0.5-0.9

2004-12-09

arxiv.org/abs/astro-ph/0412208v1

Astron.Astrophys. 433 (2005) 31-41

Astronomy and Astrophysics

Astrophysics

11 pages, 10 figures, Astron. Astrophys. accepted

Scientific paper

10.1051/0004-6361:20041879

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 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/L_B = 0.9, 7.4, 4.3 and 1.4, respectively. Together with the galaxies from Paper I, the mean = 2.5 at ~0.9, indicating no significant evolution of M/L_B with redshift. Central densities of dark matter halos for an isothermal model are 0.008, 0.035, 0.013, and 0.022 in units M_sun/pc^3, respectively. Together with the galaxies from Paper I, the DM central density of the four galaxies at mean readshift ~0.9 is rho(0) = (0.012-0.028) M_sun/pc^3, also showing no significant evolution with redshift.

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