Primordial alignment of elliptical galaxies in intermediate redshift clusters

Abstract

We measure primordial alignments for the red galaxies in the sample of eight massive galaxy clusters in the southern sky from the CLASH-VLT Large Programme, at a median redshift of 0.375. We find primordial alignment with about $3\sigma$ significance in the four dynamically young clusters, but null detection of primordial alignment in the four highly relaxed clusters. The observed primordial alignment is not dominated by any single one of the four dynamically young clusters, and is primarily due to a population of bright galaxies ($M_r<-20.5\mathrm{m}$) residing in the region 300 to 810 kpc from the cluster centers. For the first time, we point out that the combination of radial alignment and halo alignment can cause fake primordial alignment. Finally, we find that the detected alignment for the dynamically young clusters is real rather than fake primordial alignment.

10 pages, 8 figures, 1 table. Accepted for publication in MNRAS

References in corpus (15)

• Weak Gravitational Lensing with COSMOS: Galaxy Selection and Shape Measurements
• Images, structural properties and metal abundances of galaxy clusters observed with Chandra ACIS-I at 0.1<z<1.3
• CLASH: Weak-Lensing Shear-and-Magnification Analysis of 20 Galaxy Clusters
• The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology
• CLASH: The Concentration-Mass Relation of Galaxy Clusters
• Co-evolution of BCGs and ICL using CLASH
• Three Different Types of Galaxy Alignment within Dark Matter Halos
• Constraints on the Alignment of Galaxies in Galaxy Clusters from $\sim$14,000 Spectroscopic Members
• Intra Cluster Light properties in the CLASH-VLT cluster MACS J1206.2-0847
• Radial Alignment in Simulated Clusters
• Angular distribution of satellite galaxies from the Sloan Digital Sky Survey Data Release 4
• Ultraviolet Morphologies and Star-Formation Rates of CLASH Brightest Cluster Galaxies
• Robust quantitative measures of cluster X-ray morphology, and comparisons between cluster characteristics
• Galaxy Orientations in the Coma Cluster
• Radial alignment of elliptical galaxies by the tidal force of a cluster of galaxies

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• Exploring the origin of ultra-diffuse galaxies in clusters from their primordial alignment
• The Next Generation Fornax Survey (NGFS): VI. The Alignment of Dwarf Galaxies in The Fornax Cluster