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
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2015
卷号451期号:3页码:2536-2543
关键词galaxies: clusters: general galaxies: clusters: individual: Abell 2744 galaxies: kinematics and dynamics galaxies: structure
学科分类Astronomy & Astrophysics
DOI10.1093/mnras/stv865
通讯作者张双南
文章类型Article
英文摘要Unlike 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.
类目[WOS]Astronomy & Astrophysics
收录类别SCI
WOS记录号WOS:000360833700022
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被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228748
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
中国科学院高能物理研究所_粒子天体物理中心
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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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