Issue |
A&A
Volume 368, Number 1, March II 2001
|
|
---|---|---|
Page(s) | 16 - 37 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20000335 | |
Published online | 15 March 2001 |
Surface photometry of spiral galaxies in NIR: Structural parameters of disks and bulges
Landessternwarte, Königstuhl 12, 69117 Heidelberg, Germany
Corresponding author: C. Möllenhoff, cmoellen@lsw.uni-heidelberg.de
Received:
29
August
2000
Accepted:
14
November
2000
A sample of 40 bright spiral galaxies () with low
inclination and without bar was observed with JHK filters.
For this purpose the MAGIC NICMOS3 camera at the 2.2 m telescope of the
Calar Alto observatory, Spain was used. With a newly developed 2-dimensional
algorithm the distribution of the surface brightness was fitted simultaneously
by corresponding functions for the disk- and bulge-structure.
While the disk was fitted with an exponential function, the bulge profile
was fitted with a generalized de Vaucouleurs
law,
with the concentration parameter
as a further fit variable.
The correlation of the resulting structural parameters of disks and bulges
lead to some interesting relations:
1. The use of a variable exponent β is necessary for a
realistic description of the bulge structure;
2. Disks and bulges show similar correlations between effective radius,
effective surface brightness and luminosity;
3. They populate a common strip in the fundamental plane;
4. From the correlations between β and Hubble type some conclusions
about the formation and evolution of spiral galaxies can be drawn.
Key words: galaxies: spiral / galaxies: structure / galaxies: photometry / galaxies: fundamental parameters / galaxies: statistics / galaxies: formation
© ESO, 2001
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