NIR bulge, disk and spheroid luminosity functions of 2MASS sample

Using the GALPHAT ensemble posterior of 1512 K band selected galaxies in 2MASS, I estimated luminosity functions (LF) of bulge, disk and spheroid separately including the magnitude measurement error for each galaxy although I still have a problem in normalizing them. Spheroid LF has the brightest M_{\ast}, disk LF has the next brightest M_{\ast} and bulge LF has the faintest M_{\ast}. Total LF has a slightly steeper slope than the Bell et al. 2003 LF and a less steeper slope than the Huang et al. 2003 LF.

If  Sersic and bulge+disk model are good descriptions of galaxy surface brightness in large scale survey in a statistical sense, this parametric approach combined with rigorous statistical tool to assess the covariance and errors in the chosen model will be much less biased against the low surface brightness galaxies embedded in the sky background and provide a robust measurement of faint end slope of  NIR LF which is different from the optical LF. It would be very interesting to see how the faint end slope would look like when I include more fainter galaxies with Ks < 11.0.

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~ by ilsangyoon on December 1, 2010.

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