On the global structure of distant galactic disks

Details On the global structure of distant galactic disks On the global structure of distant galactic disks

2002-12-18

arxiv.org/abs/astro-ph/0212404v1

Astron.Astrophys. 399 (2003) 879-888

Astronomy and Astrophysics

Astrophysics

13 pages, 8 figures, accepted in A and A

Scientific paper

10.1051/0004-6361:20021874

Radial and vertical profiles are determined for a sample of 34 edge-on disk galaxies in the HDFs, selected for their apparent diameter larger than 1.3 arcsec and their unperturbed morphology. The thickness and flatness of their galactic disks are determined and discussed with regard to evolution with redshift. We find that sub-L* spiral galaxies with z \sim 1 have a relative thickness or flatness (characterized by h_z/h the scaleheight to scalelength ratio) globally similar to those in the local Universe. A slight trend is however apparent, with the h_z/h flatness ratio larger by a factor of \sim 1.5 in distant galaxies if compared to local samples. In absolute value, the disks are smaller than in present-day galaxies. About half of the z \sim 1 spiral disks show a non-exponential surface brightness distribution.

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