The dependence of galaxy properties on the large-scale tidal environment

Yan, Hao-Jie; White, Simon D. M.

doi:10.1093/mnras/stt141

Cited by 36 publications

(33 citation statements)

References 54 publications

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“…However, the importance of the large-scale tidal effect on the galaxy properties was challenged by several authors who pointed out that the detected signals were either too weak to be physically significant or merely reflection of strong correlations of the tidal shears with the local densities. Yan et al (2013) detected observationally a signal of correlation between the environmental shear and the galaxy morphology, which turned out to be in fact quite consistent with the result of Lee & Lee (2008). Instead of confirming the previous work, however, Yan et al (2013) refuted it with the claim that the detected signal of correlation bears only marginal physical significance as it seemed not induced by the independent tidal effect (see also Zheng et al 2017).…”

Section: Introductionsupporting

confidence: 63%

A New Perspective on the Large-scale Tidal Effect on the Galaxy Luminosity and Morphology

Lee

2018

ApJ

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We study the mean tidal coherence of galaxy environments as a function of intrinsic luminosity determined by the absolute r-band magnitude. The tidal coherence of a galaxy environment is estimated as the cosine of the angle between two minor eigenvectors of the tidal field smoothed at the scales of 2 and 30 h −1 Mpc, respectively, centered on each of the local galaxies from the Sloan Digital Sky Data Release 10. Creating four luminosity-selected samples of the Sloan galaxies, we control them to have identical density distributions, in order to nullify the dominant effect of the local density. It is found that the samples containing more luminous wall and field galaxies yield lower mean values of the tidal coherence, which trend turns out to be robust against the variation of the smoothing scales. At fixed morphology, the same trend is found for the late-type spiral and lenticular galaxies in both of the field and wall environments. The early-type spiral field galaxies show no significant dependence on the tidal coherence, while both of the least and most luminous elliptical wall galaxies are found to dwell in the regions with highest tidal coherence.Subject headings: cosmology:theory -large-scale structure of universe

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Section: Introductionsupporting

confidence: 63%

A New Perspective on the Large-scale Tidal Effect on the Galaxy Luminosity and Morphology

Lee

2018

ApJ

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“…In fact, Alonso et al (2015) show that, based on Gaussian statistics within the linear regime, we expect a variation of the halo mass function within different web components that is due solely to the underlying density field; there is no coupling to tidal forces and the theoretical halo mass function is independent of geometry at a given local density. Yan, Fan & White (2013) studied the tidal dependence of galaxy properties using the ellipticity, constructed from the eigenvalues of the tidal tensor in a way that exhibits less δ-dependence as a measure of environment than the classification method used in this work. Their analysis of SDSS data revealed no physical influence of environmental morphology on 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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“…To illustrate this point, let us simplify the problem by considering the above correlations in the distant observer approximation. Further, we will model effects due to environment by assuming that u env only depends on the local density contrast, irrespective of the adopted smoothing scale (Mo et al 2004;Faltenbacher et al 2010;Yan et al 2013). Setting u env = αδ and using the linear velocity-density relation…”

Section: Luminosity-density Correlationsmentioning

confidence: 99%

Probing cosmic velocity–density correlations with galaxy luminosity modulations

Feix

2018

Monthly Notices of the Royal Astronomical Society: Letters

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We study the possibility of using correlations between spatial modulations in the observed luminosity distribution of galaxies and the underlying density field as a cosmological probe. Considering redshift ranges, where magnification effects due to gravitational lensing may be neglected, we argue that the dipole part of such luminosity-density correlations traces the corresponding velocity-density signal which may thus be measured from a given galaxy redshift catalogue. Assuming an SDSS-like survey with mean density n = 0.01(h −1 Mpc) −3 and effective volume V eff = 0.2(h −1 Gpc) 3 at a fiducial redshift z = 0.1, we estimate that the velocity-density correlation function can be constrained with high signal-to-noise ratio 10 on scales 10-100 Mpc. Similar conclusions apply to the monopole which is sensitive to the environmental dependence of galaxy luminosities and relevant to models of galaxy formation.

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The dependence of galaxy properties on the large-scale tidal environment

Cited by 36 publications

References 54 publications

A New Perspective on the Large-scale Tidal Effect on the Galaxy Luminosity and Morphology

A New Perspective on the Large-scale Tidal Effect on the Galaxy Luminosity and Morphology

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

Probing cosmic velocity–density correlations with galaxy luminosity modulations

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