Galaxy And Mass Assembly (GAMA): The galaxy luminosity function within the cosmic web

Abstract

We investigate the dependence of the galaxy luminosity function on geometric environment within the Galaxy And Mass Assembly (GAMA) survey. The tidal tensor prescription, based on the Hessian of the pseudo-gravitational potential, is used to classify the cosmic web and define the geometric environments: for a given smoothing scale, we classify every position of the surveyed region, $0.04<z<0.26$, as either a void, a sheet, a filament or a knot. We consider how to choose appropriate thresholds in the eigenvalues of the Hessian in order to partition the galaxies approximately evenly between environments. We find a significant variation in the luminosity function of galaxies between different geometric environments; the normalisation, characterised by ${\varphi }^{\ast }$ in a Schechter function fit, increases by an order of magnitude from voids to knots. The turnover magnitude, characterised by $M^{\ast }$, brightens by approximately $0.5$ mag from voids to knots. However, we show that the observed modulation can be entirely attributed to the indirect local-density dependence. We therefore find no evidence of a direct influence of the cosmic web on the galaxy luminosity function.

15 pages, 15 figures

References in corpus (6)

• Properties of Dark Matter Haloes in Clusters, Filaments, Sheets and Voids
• Towards a Concordant Model of Halo Occupation Statistics
• Cosmic web alignments with the shape, angular momentum and peculiar velocities of dark matter haloes
• Galaxy And Mass Assembly (GAMA): The dependence of the galaxy luminosity function on environment, redshift and colour
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• The Cosmic Ballet II: Spin alignment of galaxies and haloes with large-scale filaments in the EAGLE simulation
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