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

Eardley, E, Peacock, JA, McNaught-Roberts, T, Heymans, C, Norberg, P, Alpaslan, M, Baldry, IK, Bland-Hawthorn, J, Brough, S, Cluver, ME, Driver, SP, Farrow, DJ, Liske, J, Loveday, J and Robotham, ASG (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
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record MNRAS (April 21, 2015) 448 (4): 3665-3678 is available online at: http://dx.doi.org/10.1093/mnras/stv237
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 09 Jul 2015 14:48
Last Modified: 04 Sep 2021 14:13
DOI or ID number: 10.1093/mnras/stv237
URI: https://researchonline.ljmu.ac.uk/id/eprint/1553

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