Galaxy properties and the cosmic web in simulations

Metuki, Ofer; Libeskind, Noam I.; Hoffman, Yehuda; Crain, Robert A.; Theuns, Tom

doi:10.1093/mnras/stu2166

Cited by 43 publications

(59 citation statements)

References 64 publications

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“…Fig. 2 reproduces another well known relation, namely the correlation between the mass of haloes and their web environment (Cautun et al 2014;Metuki et al 2015, and references therein). It shows the mass function, ηµ(Mvir), for the four web environments.…”

Section: Resultssupporting

confidence: 75%

The abundance and environment of dark matter haloes

Metuki

Libeskind

Hoffman

2016

Mon. Not. R. Astron. Soc.

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An open question in cosmology and the theory of structure formation is to what extent does environment affect the properties of galaxies and haloes. The present paper aims at shedding light on this problem. The paper focuses on the analysis of a dark matter only simulation and it addresses the issue of how the environment affects the abundance of haloes, which are are assigned four attributes: their virial mass, an ambient density calculated with an aperture that scales with R vir (∆ M ), a fixedaperture (∆ R ) ambient density, and a cosmic web classification (i.e. voids, sheets, filaments, and knots, as defined by the V-web algorithm). ∆ M is the mean density around a halo evaluated within a sphere of a radius of 5R vir , where R vir is the virial radius. ∆ R is the density field Gaussian smoothed with R = 4 h −1 Mpc, evaluated at the center of the halo. The main result of the paper is that the difference between haloes in different web elements stems from the difference in their mass functions, and does not depend on their adaptive-aperture ambient density. A dependence on the fixed-aperture ambient density is induced by the cross correlation between the mass of a halo and its fixed-aperture ambient density.

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Section: Resultssupporting

confidence: 75%

The abundance and environment of dark matter haloes

Metuki

Libeskind

Hoffman

2016

Mon. Not. R. Astron. Soc.

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“…This has allowed us to search for the impact of large-scale tidal forces on the galaxy population, and there have been a number of studies suggesting that an effect of this sort should be present. Metuki et al (2015) conducted a thorough analysis of galaxy properties within the cosmic web, finding significant dependences on location, which they attributed largely to the strong relationship between galaxy properties and the properties of their host haloes, which are in turn linked to their geometric environments. They found that the strong dependence of the halo mass function on the cosmic web was the main cause of the apparent dependence of galaxy properties.…”

Section: S U M M a Ry A N D Discussionmentioning

confidence: 99%

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

Eardley

Peacock

McNaught-Roberts

et al. 2015

Monthly Notices of the Royal Astronomical Society

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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 normalisation, characterised by φ * in a Schechter function fit, increases by an order of magnitude from voids to knots. The turnover magnitude, characterised 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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“…There has been extensive work in quantifying and understanding the properties of the cosmic web from N-body simulations, as well as its interplay with various intrinsic halo and galaxy properties (Hahn et al 2007;Yan et al 2013;Forero-Romero et al 2014;Libeskind et al 2014;Nuza et al 2014;Metuki et al 2015) and a smaller number of groups have attempted similar studies on galaxy survey data (Bond et al 2010a;Eardley et al 2015;Chen et al 2015). Often this is done by using the galaxy number density in redshift space as a proxy for the real-space matter density.…”

Section: Introductionmentioning

confidence: 99%

Recovering the tidal field in the projected galaxy distribution

Alonso

Hadzhiyska

Strauss

2016

Mon. Not. R. Astron. Soc.

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We present a method to recover and study the projected gravitational tidal forces from a galaxy survey containing little or no redshift information. The method and the physical interpretation of the recovered tidal maps as a tracer of the cosmic web are described in detail. We first apply the method to a simulated galaxy survey and study the accuracy with which the cosmic web can be recovered in the presence of different observational effects, showing that the projected tidal field can be estimated with reasonable precision over large regions of the sky. We then apply our method to the 2MASS survey and present a publicly available full-sky map of the projected tidal forces in the local Universe. As an example of an application of these data we further study the distribution of galaxy luminosities across the different elements of the cosmic web, finding that, while more luminous objects are found preferentially in the most dense environments, there is no further segregation by tidal environment.

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Galaxy properties and the cosmic web in simulations

Cited by 43 publications

References 64 publications

The abundance and environment of dark matter haloes

The abundance and environment of dark matter haloes

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

Recovering the tidal field in the projected galaxy distribution

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