Astron. Astrophys. Suppl. Ser. 144, 405-428
Three-dimensional modelling of edge-on disk galaxies
M. Pohlen - R.-J. Dettmar - R. Lütticke - U. Schwarzkopf
Astronomisches Institut, Ruhr-Universität Bochum,
D-44780 Bochum, Germany
e-mail: (pohlen, dettmar, luett, schwarz)@astro.ruhr-uni-bochum.de
Received July 21, 1999; accepted March 23, 2000
We present detailed three-dimensional modelling of the stellar luminosity
distribution for the disks of 31 relatively nearby (
110 Mpc) edge-on
In contrast to most of the standard methods available in the literature
we take into account the full three-dimensional information of the disk.
We minimize the difference between the observed 2D-image and an image of
our 3D-disk model integrated along the line of sight. Thereby we specify the
inclination, the fitting function for the z
-distribution of the disk, and the
best values for the structural parameters such as scalelength,
scaleheight, central surface brightness, and a disk cut-off radius.
From a comparison of two independently developed methods we conclude, that
the discrepancies e.g. for the scaleheights and scalelengths are of the order
10%. These differences are not due to the individual method
itself, but rather to the selected fitting region, which masks the bulge
component, the dust lane, or present foreground stars. Other serious
limitations are small but appreciable intrinsic deviations of
real disks compared to the simple input model.
In this paper we describe the methods and present contour plots as well as
radial profiles for all galaxies without previously published surface
photometry. Resulting parameters are given for the complete sample.
Key words: galaxies: fundamental parameters -- galaxies: photometry --
galaxies: structure -- galaxies: spiral
Copyright The European Southern Observatory (ESO)