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Radial alignment of elliptical galaxies by the tidal force of a cluster of galaxies
Rong Y(容昱); Yi SX(易疏序); Zhang SN(张双南); Rong, Y; Yi, SX; Zhang, SN; Tu, H
Corresponding Author张双南
AbstractUnlike the random radial orientation distribution of field elliptical galaxies, galaxies in a cluster are expected to point preferentially towards the centre of the cluster, as a result of the cluster's tidal force on its member galaxies. In this work, an analytic model is formulated to simulate this effect. The deformation time-scale of a galaxy in a cluster is usually much shorter than the time-scale of change of the tidal force; the dynamical process of tidal interaction within the galaxy can thus be ignored. The equilibrium shape of a galaxy is then assumed to be the surface of equipotential that is the sum of the self-gravitational potential of the galaxy and the tidal potential of the cluster at this location. We use a Monte Carlo method to calculate the radial orientation distribution of cluster galaxies, by assuming a Navarro-Frenk-White mass profile for the cluster and the initial ellipticity of field galaxies. The radial angles show a single-peak distribution centred at zero. The Monte Carlo simulations also show that a shift of the reference centre from the real cluster centre weakens the anisotropy of the radial angle distribution. Therefore, the expected radial alignment cannot be revealed if the distribution of spatial position angle is used instead of that of radial angle. The observed radial orientations of elliptical galaxies in cluster Abell 2744 are consistent with the simulated distribution.
Keywordgalaxies: clusters: general galaxies: clusters: individual: Abell 2744 galaxies: kinematics and dynamics galaxies: structure
Subject AreaAstronomy & Astrophysics
Indexed BySCI ; ADS
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000360833700022
ADS Bibcode2015MNRAS.451.2536R
ADS URLhttps://ui.adsabs.harvard.edu/abs/2015MNRAS.451.2536R
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2015MNRAS.451.2536R/citations
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Cited Times:10 [ADS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Rong Y,Yi SX,Zhang SN,et al. Radial alignment of elliptical galaxies by the tidal force of a cluster of galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,451(3):2536-2543.
APA 容昱.,易疏序.,张双南.,Rong, Y.,Yi, SX.,...&Tu, H.(2015).Radial alignment of elliptical galaxies by the tidal force of a cluster of galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,451(3),2536-2543.
MLA 容昱,et al."Radial alignment of elliptical galaxies by the tidal force of a cluster of galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 451.3(2015):2536-2543.
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