The Hawaii-AAO K-band Galaxy Redshift Survey -- Paper I: The Local K-band Luminosity Function

J. -S. Huang; K. Glazebrook; L. L. Cowie; C. Tinney

doi:10.1086/345619

paper

The Hawaii-AAO K-band Galaxy Redshift Survey -- Paper I: The Local K-band Luminosity Function

arXiv:astro-ph/0209440 · doi:10.1086/345619

Abstract

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 $°^{2}$ . We derive both the non-parametric and Schechter luminosity function from our data, and determine $M^{*} (K) = - 23.70 \pm 0.08 + 5 lo g_{10} (h)$ , $α = - 1.37 \pm 0.10$ and $ϕ^*=0.013\pm0.003 h^3 \Mpc^{-3}$ for a universe with $Ω_{m} = 0.3$ and $Ω_{Λ} = 0.7$ . 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 $M^{*}$ and a steep slope, while early-type galaxies have a much brighter $M^{*}$ 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.

The Hawaii-AAO K-band Galaxy Redshift Survey -- Paper I: The Local K-band Luminosity Function

Abstract

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