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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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 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 UNIV PRESS
Related URLs:	Author
Date Deposited:	28 Oct 2015 13:07
Last Modified:	04 Sep 2021 14:03
DOI or ID number:	10.1093/mnras/stv237
URI:	https://researchonline.ljmu.ac.uk/id/eprint/1874

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• Galaxy And Mass Assembly (GAMA): the galaxy luminosity function within the cosmic web. (deposited 09 Jul 2015 14:48)
  • Galaxy And Mass Assembly (GAMA): the galaxy luminosity function within the cosmic web. (deposited 28 Oct 2015 13:07) [Currently Displayed]

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