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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.; Robotham, A.S.G.

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


E. Eardley

J.A. Peacock

T. McNaught-Roberts

C. Heymans

M. Alpaslan

I. Baldry

J. Bland-Hawthorn

S. Brough

M.E. Cluver

S.P. Driver

D.J. Farrow

J. Liske

J. Loveday

A.S.G. Robotham


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.


Eardley, E., Peacock, J., McNaught-Roberts, T., Heymans, C., Norberg, P., Alpaslan, M., …Robotham, A. (2015). Galaxy And Mass Assembly (GAMA): the galaxy luminosity function within the cosmic web. Monthly Notices of the Royal Astronomical Society, 448(4), 3665-3678.

Journal Article Type Article
Acceptance Date Feb 3, 2015
Publication Date Apr 21, 2015
Deposit Date Feb 3, 2016
Publicly Available Date Feb 11, 2016
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 448
Issue 4
Pages 3665-3678
Keywords Surveys, Galaxies: luminosity function, mass function, Cosmology: observations, Large-scale structure of Universe.


Published Journal Article (3.7 Mb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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