期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 448, 期 4, 页码 3665-3678出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv237
关键词
surveys; galaxies: luminosity function, mass function; cosmology: observations; large-scale structure of Universe
资金
- Science and Technology Facilities Council
- ERC [DEGAS-259586, DEGAS- 259586]
- ERC under the EC [240185]
- Royal Society through the award of a University Research Fellowship
- STFC (UK)
- ARC (Australia)
- AAO
- Spanish MultiDark Consolider Project [CSD2009-00064]
- STFC [ST/K003577/1, ST/L000652/1, ST/J002291/1, ST/L00075X/1, ST/I003088/1, ST/L005042/1, ST/J001422/1, ST/H00131X/1, ST/H008578/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J002291/1, ST/L005042/1, ST/H008578/1, ST/M000966/1, ST/I003088/1, ST/H00131X/1, ST/K003577/1, ST/L00075X/1, ST/L000652/1] Funding Source: researchfish
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.
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