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

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Driver_2015_MNRAS_GAMACosmicWeb.pdf (3.461Mb)
Date
21/04/2015
Author
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.
Keywords
Surveys
Galaxies: luminosity function, mass function
Cosmology: observations
Large-scale structure of Universe
Dark-matter Haloes
Digital Sky Survey
Redshift survey
Star-formation
Environment
Dependence
Evolution
Classification
Statistics
Filaments
QB Astronomy
QC Physics
3rd-NDAS
Metadata
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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 phi* 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.
Citation
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 2015 , ' Galaxy And Mass Assembly (GAMA) : the galaxy luminosity function within the cosmic web ' Monthly Notices of the Royal Astronomical Society , vol. 448 , no. 4 , pp. 3665-3678 . DOI: 10.1093/mnras/stv237
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stv237
ISSN
0035-8711
Type
Journal article
Rights
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Description
EE acknowledges support from the Science and Technology Facilities Council. TMR acknowledges support from a ERC Starting Grant (DEGAS-259586). CH acknowledges support from the ERC under the EC FP7 grant number 240185. PN acknowledges the support of the Royal Society through the award of a University Research Fellowship and the ERC, through receipt of a Starting Grant (DEGAS- 259586).
Collections
  • University of St Andrews Research
  • Physics & Astronomy Research
URI
http://hdl.handle.net/10023/6574

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