On the global structure of distant galactic disks

Free access article

Issue		A&A Volume 399, Number 3, March I 2003


Page(s)		879 - 887
Section		Galactic structure and dynamics
DOI		http://dx.doi.org/10.1051/0004-6361:20021874

A&A 399, 879-887 (2003)
DOI: 10.1051/0004-6361:20021874

On the global structure of distant galactic disks

V. P. Reshetnikov^{1, 2, 3}, R.-J. Dettmar², ⁴ and F. Combes⁴

¹ Astronomical Institute of St. Petersburg State University, 198504 St. Petersburg, Russia
² Astronomisches Institut der Ruhr-Universität Bochum, Universitätsstr. 150 NA7, 44780 Bochum, Germany
³ Isaac Newton Institute of Chile, St. Petersburg Branch, Russia
⁴ Astronomical Institute of St. Petersburg State University, 198504 St. Petersburg, Russia Astronomisches Institut der Ruhr-Universität Bochum, Universitätsstr. 150 NA7, 44780 Bochum, Germany Isaac Newton Institute of Chile, St. Petersburg Branch, Russia LERMA, Observatoire de Paris, 61 Av. de l'Observatoire, 75014 Paris, France

(Received 11 July 2002 / Accepted 3 December 2002 )

Abstract
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´´ 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 ~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.

Key words: galaxies: evolution -- galaxies: high-redshift -- galaxies: structure

Offprint request: V. P. Reshetnikov, resh@astro.spbu.ru

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