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Aperture photometry and growth curve analysis allows a relatively
reliable method for determining the model independent parameters
39#39 ,
40#40, which are the radius containing half the emitted ligh
and the mean magnitude within this radius respectively.These are
parameters whith which one can easily compare galaxies, as they are
readily available in the literature and are easy to obtain. One can also
determine a surface brightness profile from the growth
curves9 and derive for
example exponential model profile parameters for the best fits to the
profiles, e.g. 41#41 and 42#42, the central surface brightness
and the slope of the exponential fit
43#43. A sample of
surface brightness profiles and exponential fits thereof are shown in
Fig. ![[*]](file:/sw/share/lib/latex2html/icons/crossref.png)
.
Figure:
Radial surface brightness profiles of dwarf
galaxies in 10#10 (filled circles) and 11#11 (open circles)
|
44#44 |
Andal Kronawitter
2005-10-07