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

Eardley, E, Peacock, J A, McNaught-Roberts, T, Heymans, C, Norberg, P, Alpaslan, M, Baldry, I, Bland-Hawthorn, J, Brough, S, Cluver, M E, Driver, S P, Farrow, D J, Liske, J, Loveday, J and Robotham, A S G (2015) Galaxy And Mass Assembly (GAMA): the galaxy luminosity function within the cosmic web. Monthly Notices of the Royal Astronomical Society, 448 (4). pp. 3665-3678. ISSN 0035-8711

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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 normalization, characterized by ϕ* in a Schechter function fit, increases by an order of magnitude from voids to knots. The turnover magnitude, characterized by M*, 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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Depositing User: Jonathan Loveday
Date Deposited: 24 Jun 2015 13:57
Last Modified: 02 Jul 2019 19:53

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