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

• Published in: Research in astronomy and astrophysics 2019-08, Vol.19 (8), p.113
• Main Authors: Zhao, Pin-Song, Wu, Hong, Kevin Xu, Cong, Yang, Ming, Yang, Fan, Zhu, Yi-Nan, I Lam, Man, Jin, Jun-Jie, Yuan, Hai-Long, Zhang, Hao-Tong, Shen, Shi-Yin, Shi, Jian-Rong, Luo, A-Li, Wu, Xue-Bing, Zhao, Yong-Heng, Jing, Yi-Peng
• Format: Article
• Language: English
• Subjects: Absorption; Emission analysis; Emission lines; Galaxies; galaxies: distances and redshifts; galaxies: luminosity function, mass function; galaxies: statistics; Luminosity; Mathematical analysis; Sky surveys (astronomy); Spectroscopy
• ISSN: 1674-4527
• DOI: 10.1088/1674-4527/19/8/113

We present optical luminosity functions (LFs) of galaxies in the 0.1g, 0.1r, 0.1i bands, calculated using data in ∼ 40 deg 2 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 − 2 h 3 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.