Galaxy And Mass Assembly (GAMA): $\mathbf{z}\sim 0$ Galaxy Luminosity Function down to $\mathbf{L}\sim 10^6{\mathbf{L}}_{\odot }$ via Clustering Based Redshift Inference

Abstract

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

21 pages, 13 figures, accepted by MNRAS

References in corpus (18)

• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Forty-Seven Milky Way-Sized, Extremely Diffuse Galaxies in the Coma Cluster
• The Luminosity Function of the Milky Way Satellites
• The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees
• emcee v3: A Python ensemble sampling toolkit for affine-invariant MCMC
• Calibrating Redshift Distributions Beyond Spectroscopic Limits with Cross-Correlations
• On the galaxy stellar mass function, the mass-metallicity relation, and the implied baryonic mass function
• Discovery of New Dwarf Galaxies in the M81 Group
• Galaxy And Mass Assembly (GAMA): The galaxy stellar mass function to $z=0.1$ from the r-band selected equatorial regions
• SDSS Galaxy Clustering: Luminosity & Colour Dependence and Stochasticity
• Using Galaxy Two-point Correlation Functions to Determine the Redshift Distributions of Galaxies Binned by Photometric Redshift
• Galaxy And Mass Assembly (GAMA): Assimilation of KiDS into the GAMA database
• Reconstructing Redshift Distributions with Cross-Correlations: Tests and an Optimized Recipe
• The Globular Cluster Systems in the Coma Ellipticals. IV: WFPC2 Photometry for Five Giant Ellipticals
• Galaxy And Mass Assembly (GAMA): the Stellar Mass Budget of Galaxy Spheroids and Disks
• Clustering-based Redshift Estimation: Comparison to Spectroscopic Redshifts
• 2dFLenS and KiDS: Determining source redshift distributions with cross-correlations
• The $-12$ mag dip in the galaxy luminosity function of Hickson Compact Groups

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• Toward accurate measurement of property-dependent galaxy clustering: II. Tests of the smoothed density-corrected $V_{\max }$ method