Surface photometry of spiral galaxies in NIR: Structural parameters of disks and bulges

Details Surface photometry of spiral galaxies in NIR: Structural parameters of disks and bulges Surface photometry of spiral galaxies in NIR: Structural parameters of disks and bulges

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...368...16m&link_type=abstract

Astronomy and Astrophysics, v.368, p.16-37 (2001)

Statistics

102

Galaxies: Spiral, Galaxies: Structure, Galaxies: Photometry, Galaxies: Fundamental Parameters, Galaxies: Statistics, Galaxies: Formation

Scientific paper

A sample of 40 bright spiral galaxies (BT < 12) 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 Rbeta law, with the concentration parameter beta = 1/n 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 beta 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 beta and Hubble type some conclusions about the formation and evolution of spiral galaxies can be drawn.

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