Vol 19, No 8

The galaxy luminosity function in the LAMOST Complete Spectroscopic Survey of Pointing Area at the Southern Galactic Cap

Pin-Song Zhao, Hong Wu, Cong Kevin Xu, Ming Yang, Fan Yang, Yi-Nan Zhu, Man-I Lam, Jun-Jie Jin, Hai-Long Yuan, Hao-Tong Zhang, Shi-Yin Shen, Jian-Rong Shi, A-Li Luo, Xue-Bing Wu, Yong-Heng Zhao, Yi-Peng Jing


Abstract We present optical luminosity functions (LFs) of galaxies in the 0.1g, 0.1r, 0.1i bands, calculated using data in ∼ 40 deg2 sky area of the LAMOST Complete Spectroscopic Survey of Pointing Area (LaCoSSPAr) in the Southern Galactic Cap. Redshifts for galaxies brighter than r = 18.1 were obtained mainly with LAMOST. In each band, LFs derived using both parametric and non-parametric maximum likelihood methods agree well with each other. In the 0.1r band, our fitting parameters of the Schechter function are ϕ∗ = (1.65 ± 0.36) × 10−2h3 Mpc−3, M∗ = −20.69 ± 0.06 mag and α = −1.12 ± 0.08, which agree with previous studies. Separate LFs are also derived for emission line galaxies and absorption line galaxies. The LFs of absorption line galaxies show a dip at 0.1r∼18.5 and can be fitted well by a double-Gaussian function, suggesting a bimodality in passive galaxies.


Keywords galaxies: luminosity function, mass function — galaxies: statistics — galaxies: distances and redshifts

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