4.7 Article

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

期刊

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

  1. Science and Technology Facilities Council
  2. ERC [DEGAS-259586, DEGAS- 259586]
  3. ERC under the EC [240185]
  4. Royal Society through the award of a University Research Fellowship
  5. STFC (UK)
  6. ARC (Australia)
  7. AAO
  8. Spanish MultiDark Consolider Project [CSD2009-00064]
  9. 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
  10. 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

向作者/读者索取更多资源

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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