.. _book_fig_chapter4_fig_lyndenbell_gals:


Lynden-Bell Luminosity function
-------------------------------
Figure 4.10.

An example of computing the luminosity function for two u-r color-selected
subsamples of SDSS galaxies using Lynden-Bell's C- method. The galaxies are
selected from the SDSS spectroscopic sample, with redshift in the range
0.08 < z < 0.12 and flux limited to r < 17.7. The left panels show the
distribution of sources as a function of redshift and absolute magnitude. The
distribution p(z, M) = rho(z) Phi(m) is obtained using Lynden-Bell's method,
with errors determined by 20 bootstrap resamples. The results are shown in the
right panels. For the redshift distribution, we multiply the result by z^2 for
clarity. Note that the most luminous galaxies belong to the photometrically
red subsample, as discernible in the bottom-right panel.



.. image:: ../images/chapter4/fig_lyndenbell_gals_1.png
    :scale: 100
    :align: center


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