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28 March 2024
 
  » arxiv » astro-ph/0011456

 Article overview


The K-Band Galaxy Luminosity Function
C.S. Kochanek ; M.A. Pahre ; E.E. Falco ; J.P. Huchra ; J. Mader ; T.H Jarrett ; T. Chester ; R. Cutri ; S.E. Schneider ;
Date 24 Nov 2000
Subject astro-ph
Affiliation Harvard-Smithsonian Center for Astrophysics Infrared Processing and Analysis Center Department of Astronomy, University of Massachusetts
AbstractWe measured the K-band luminosity function using a complete sample of 4192 morphologically-typed 2MASS galaxies with 7 < K < 11.25 mag spread over 2.12 str. Early-type (T < -0.5) and late-type (T > -0.5) galaxies have similarly shaped luminosity functions, alpha_e=-0.92+/-0.10 and alpha_l=-0.87+/-0.09. The early-type galaxies are brighter, M_*e=-23.53+/-0.06 mag compared to M_*l=-22.98pm0.06 mag, but less numerous, n_*e=(0.0045+/-0.0006)h^3/Mpc^3 compared to n_*l=(0.0101+/-0.0013)h^3/Mpc^3 for H_0=100h km/s Mpc, such that the late-type galaxies slightly dominate the K-band luminosity density, j_late/j_early=1.17+/-0.12. Our morphological classifications are internally consistent, consistent with previous classifications and lead to luminosity functions unaffected by the estimated uncertainties in the classifications. These luminosity functions accurately predict the K-band number counts and redshift distributions for K < 18 mag, beyond which the results depend on galaxy evolution and merger histories.
Source arXiv, astro-ph/0011456
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