The Hawaii-AAO K - band galaxy redshift survey. 1. The Local K - band luminosity function

Sep, 2002
7 pages
Published in:
  • Astrophys.J. 584 (2003) 203-209
e-Print:

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Abstract: (arXiv)
We present the K-band local luminosity function derived froma sample of 1056 bright (K<15) K-selected galaxies from the Hawaii-AAO K-band redshift survey. The Hawaii-AAO K-band redshift survey covers 4 equatorial fields with a total area of 8.22 deg2\deg^2. We derive both the non-parametric and Schechter luminosity function from our data, and determine M(K)=23.70±0.08+5log10(h)M^*(K)=-23.70\pm0.08+5\log_{10}(h), α=1.37±0.10\alpha=-1.37\pm0.10 and \phi^*=0.013\pm0.003 h^3 \Mpc^{-3} for a universe with Ωm=0.3\Omega_m=0.3 and ΩΛ=0.7\Omega_{\Lambda}=0.7. We also measure the K-band luminosity function for the early- and later-type galaxies from our morphologically classified subsample. It appears that later-type galaxies have a fainter MM^* and a steep slope, while early-type galaxies have a much brighter MM^* and a quite flat slope in their K-band luminosity functions. This is consistent with what have been found in optical type dependent luminosity function. The K-band luminosity density derived using our luminosity function is now measured at a similar redshift depth to optical luminosity densities in the SDSS redshift survey. It is 2 times higher than the previous measurement from the shallower 2MASS sample and resolves the previously reported discrepancies between optical and near-IR luminosity densities.
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