Galaxy And Mass Assembly (GAMA): <i>z</i> ~ 0 galaxy luminosity function down to <i>L</i> ~ 106 L⊙ via clustering based redshift inference

In this study we present a new experimental design using clustering-based redshift inference to measure the evolving galaxy luminosity function (GLF) spanning 5.5 decades from $L \sim 10^{11.5}$ $ 10^6 ~ \mathrm{L}_\odot$. We use data Galaxy And Mass Assembly (GAMA) survey and Kilo-Degree Survey (KiDS). derive distributions in bins of apparent magnitude limits GAMA-KiDS photometric catalogue: $m_r \lesssim 23$; more than decade beyond GAMA spectroscopic sample via inference. This technique uses spatial cross-correlation statistics for reference set with known redshifts (in our case, main sample) distribution target ensemble. For calibration simple parametrisation an adaptive normalisation factor over interval $0.005 < z 0.48$ clustering results. find that GLF has relatively constant power-law slope $\alpha \approx -1.2$ $-17 M_r -13$, then appears steepen sharply $-13 -10$. upturn be where Globular Clusters (GCs) take dominate source counts as luminosity. Thus have mapped across full range $z 0$ field population most luminous galaxies down GC scale.