2015
DOI: 10.1093/mnras/stv865
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Radial alignment of elliptical galaxies by the tidal force of a cluster of galaxies

Abstract: Unlike the random radial orientation distribution of field elliptical galaxies, galaxies in a cluster are expected to point preferentially towards the center 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 the tidal interaction within the galaxy can thus be ign… Show more

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Cited by 16 publications
(16 citation statements)
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“…Several mechanisms have been proposed to make the radial alignment in a cluster, including tidal torque (Ciotti & Dutta 1994;Adami et al 2009;Pereira & Bryan 2010;Rong et al 2015a) and primordial alignment (Plionis et al 2003;Faltenbacher et al 2007;Rong et al 2015b).…”
Section: Origin Of the Radial Alignmentmentioning
confidence: 99%
“…Several mechanisms have been proposed to make the radial alignment in a cluster, including tidal torque (Ciotti & Dutta 1994;Adami et al 2009;Pereira & Bryan 2010;Rong et al 2015a) and primordial alignment (Plionis et al 2003;Faltenbacher et al 2007;Rong et al 2015b).…”
Section: Origin Of the Radial Alignmentmentioning
confidence: 99%
“…Because IA are impacted by the large-scale tidal field and other fields, they are also potentially of interest as a probe of the LSS and its effects on galaxies. This effect has already been studied in simulations [38][39][40] and observationally, on small scales in highly clustered environments [41,42], for red galaxies in SDSS-BOSS [43][44][45] and Mega-Z [46], and for blue galaxies in CFHTLenS [47] and WiggleZ [48]. Observations suggest as well that different galaxy populations exhibit different magnitudes of the IA signal, with more massive galaxies aligning more strongly with the LSS [49] and different color/morphological types displaying different IA amplitudes, underscoring the need for robust models of the physical processes which influence IA.…”
Section: Introductionmentioning
confidence: 78%
“…The illustrations of the three angles θ, φ, and ξ, which are used to test for the primordial alignment, and radial alignment, as well as distributions of the satellite galaxies, respectively. oriented toward the center of the parent cluster, however, is crucial to study the tidal interaction between the satellites and central dominant galaxy/parent cluster after galaxies falling into a cluster knot along the large-scale filaments, as well as mass distribution and dynamical state of the parent cluster (e.g., Pereira et al 2008;Rong et al 2015aRong et al , 2019bSchneider et al 2013).…”
Section: Introductionmentioning
confidence: 99%